I'm a boat builder in the uk and have had to repair a number of yachts with similar damage. I think I've seen four Oceanis 34's in the past couple of years for example. Couple of things that struck me from the video. Your info re epoxy is incorrect. I agree that laminating strength would be fine using polyester or even better, vinylester. However this repair relies on bonding performance to a vinylester hull as well as laminating. Bonding performance of vinylester on cured vinylester laminate is reasonable. The bonding performance of polyester however is poor. Epoxy will significantly outperform both. Finishing of the inside of the hull using a white epoxy primer is just as easy as gellwashing it, with the added benefit of the epoxy being watertight where'as the gelcoat is microporus. (hense Osmosis) I would also advise the use of Polysulphide sealant such as Arbokol1000 for the keel joint. You really don't need the adhesive qualities of Sika or Saba as thats what the Keel bolts are there for. What you do need is the sealing qualities and Adhesive Sealants tend to lose their sealant qualities long before the adhesive. Overtime when the sealant hardens it loses its flex and water will creep in via capilary action to the root of the keelbolts providing the ideal conditions for crevis crack corrosion. I have seen this numerous times. Much better to use a flexible sealant that does not harden over time and rely on the keelbolts to hold the keel on as thats what they're there for.

@billhanna8838

3 жыл бұрын

And if ever the keel has to come off again you dont rip part of the hull off .

@gbr562

3 жыл бұрын

@@billhanna8838 We have a rule here at the yard that if its bolted down (cleats, fairleads, tracks, hatches etc) then use Arbokol or even butyl tape. The main resoning is that the majority of these fittings will be removed again within 10 years for one reason or another. Also keelbolts are not a tighten up and forget job, they need re tightening to the correct torque on a regular basis (every two or three years) as the bolts do stretch a little, the laminate will compress a little.

@SailingAurora

3 жыл бұрын

Hi Mike, it sounds like you have a lot of experience, I appreciate you watching. Thanks for the input It's good to compare different procedures and materials. About the polyester... you will see more of this in the next video but I will explain. As you said Polyester resin on it's own will not laminate well to vinylester, this is why the Crestafix polyester adhesive is used to create the initial bond between the hull and the first layer of glass and as you know this is the most important part. Plastskador have done multiple tests with this method and it's proved extremely strong. The glass is then laid on top and the polyester resin can then be wetted in. Also the reason the polyester is used is because it's more than strong enough for this application, Plastskador have witnessed many times, previously repaired boats that have been grounded again come back with damages located in the next weakest area in the boat. Usually the damage new damage is located further up the hull and not in the previously repaired area. As you mentioned there are ways of finishing the epoxy using primer but gelcoat can be applied to the polyester and in my opinion will create a nicer finish and closer to the way it looked leaving the factory. When it comes to the keel, Plastskador have seen on occasion that the shock of a grounding can sometimes strip the bolts and because the sealant is flexible it will pull the keel back towards the boat. I saw this fist hand with our boat, the bolts held but there was water in the bilge directly after the grounding. The leak had stopped because the adhesive pulled the keel back up and resealed the gap. I personally I would prefer both a sealant and adhesive holding the keel on for maximum safety, I wouldn't want to rely on just the bolts. You can see at the end of my first repair video how much extra holding strength it gives the keel. Thanks for the advice on the chemicals though, I will check them out, cheers

@al29_fam_vids

3 жыл бұрын

On the maxi 1000 owners website nice article on removal of a glassed in keel recessed what a nightmare it is to get off compared to this one - echoing the builders chaps points above some thought on maintenance helps - this boat in question did not sink or loose it’s keel and can be mended - good result nice work

@billhanna8838

3 жыл бұрын

@@gbr562 Yes seen a Bavaria s keel twice removed (Charter boat & Funny same rock) Not a nice ending with the keel epoxied , Medium Job become a major repair

This makes me feel great about our decision to buy an older Swan rather than a (much) newer Beneteau for similar money.

you should check out how X-Yachts mount their keel into a steal craddle that also takes the mast and the spreaders. Had a grounding with my X-442 on an uncharted rock after Tsunami in Thailand, at about 6 knots, the boat stopped with a massive bang, but we managed to here off the rock. On inspection, the lower led keel itself had some holes and scoops of led missing. The keel to hull bond was solid all around, no cracks in the hull or keel mount area. Inside the craddle was in perfect shape, no delamination, keel bolts straight and undamaged. Back in the water in a few days. X-Yachts !

@SailingAurora

2 ай бұрын

Sounds like you got very lucky, i saw an x yacht being repaired the other day, would put the picture here if possible. The X yachts are awesome boats, you really get what you pay for but it comes at a cost. A new x Yacht is more than double a Hanse, wish I could afford one. They have a steel grid instead of fibreglass. The only problem is, if the steel grid bends, you are in big problems. Great boats though and very fast. This year we raced my friends x443. Cheers

I had a brand new yacht custom built I later was shocked at how thin the laminations were. I later bought an older yacht that was built by a well respected builder and the difference in strength is extraordinary. Years later this yacht still looks new. Zero stress fractures.

@SailingAurora

6 ай бұрын

It's amazing what a little extra can do with boat building, it's all about the budget I guess :)

So good to hear progress is being made and also to be stronger and better, theres always something new to learn, I hope you guys get it back in the water before summer!

@SailingAurora

3 жыл бұрын

Thank you. Yes we are trying to look at the positive side of the situation, learning along the way and yes she will be stronger when she is done. We can't wait for the new season and to big back on the water. Cheers, Chris & Tanja

Thanks brother for the detailed video. I'm hoping to buy a sailboat in the future and still learning a lot. Seeing the inter workings and hull is a big help!

@SailingAurora

3 жыл бұрын

Thank you Dwight! Wish you good luck, and hope you dream of a sailboat is just around the corner. There is a lot to learn indeed, and it never stops. Cheers, Chris & Tanja

Subscribed -- right away. Super interesting, will binge watch all of your episodes. Thanks for sharing.

@SailingAurora

3 жыл бұрын

No worries, I hope you enjoy. Trying to bring some good content. Cheers

Excellent presentation, and very informative. Also the comment section has some great experts. Subscribed straight away.

@SailingAurora

3 жыл бұрын

Thanks very much, hope you enjoy our channel 😀

A good summary. Aligns with my experience having been there myself. On my yacht the workmanship for the repair was absolutely top notch.

@SailingAurora

3 жыл бұрын

Hi Jeremy. Thank you so much! Sad to hear that you also had to go through this, but good to hear that you had a good experience with the workmanship. All the best, Chris & Tanja

@jeremyrowley1240

3 жыл бұрын

@@SailingAurora Mine was caused by a faulty lift where the entire weight of the boat was concentrated on the back of the keel, but had the same effect. An initial bang like a pistol shot, then the expensive sound of cracking fibre glass as the matrix crumbled. Quiet disheartening.

It is really entertaining to watch boat repairs. 👍

@SailingAurora

3 жыл бұрын

Thanks. Yes, really interesting. Stay safe, Chris & Tanja

I found this video to be very well explained and that I learnt a lot from it. Subscribed due to that.

@SailingAurora

2 жыл бұрын

Thanks Susan, sorry so late to reply. Really appreciate your comment

Very interesting video, when bilge pumps and float switches are great when they work, but have their challenging moments like when the connections corrode, thanks again for a great video

@philgray1023

3 жыл бұрын

Test them every trip. Even so they only fail when you need them.

@SailingAurora

3 жыл бұрын

Hi Franki. Thank you so much! We actually bought the new bilge pump, tested it in the kitchen, with a flooded kitchen as a result:-) Yes, you are right maintenance is key for everything to work when you need it. Also something to do on boat! All the best, Chris & Tanja

Truly great and helpful vid. I believe the industry will see a partial return to integrated, modified full keels. Subscribed. Thx.

@SailingAurora

Жыл бұрын

Glad you found it useful, you are more than welcome

Looking like a really good repair..cheers

@SailingAurora

3 жыл бұрын

Hi Brian, yes we are really happy with the process and plan for the repair. Stay safe, Chris & Tanja

I find it really interesting to watch and learn more. Yes it was an unfortunate charter accident that you would rather not have had. But on the positive side, the boat should be stronger because of it. Thanks for another informative video.

@SailingAurora

3 жыл бұрын

Thanks Andy! Yes, she will be a stronger boat when the new season starts. Hope you will be joining us on Aurora one day?! Stay safe and take care, Chris & Tanja

Fantastic footage and description. Keep it up!

@SailingAurora

3 жыл бұрын

Hi Frank. Thank you so much, glad you likes it. Cheers, Chris & Tanja

I know exactly what you’re going through, my sailboat was grounded last year by me and is in a workshop in Oxelösund now. Because of the Covid they didn’t let me see it while in repair shop and today the keel was mounted back. Next week they will finish up and the boat is ready for a new season. Because of your video , tomorrow I will be driving there and have a look at my boat, I haven’t seen it in a month and I miss her allot. At least your boat is closer to where you live and you can see the progress .I also live in Stockholm area but driving 250km both ways is not something you can do every day. My boat was repaired in about 2 weeks. See u on the water and keep making this videos, by the way, good job on editing 😁!

@SailingAurora

3 жыл бұрын

Aww man, sorry you have had to go through this experience also. I hope the visit went well to your boat. I miss our boat even if it's only been a few days. Thanks for the compliment, hope to see you on the water, cheers Chris

I came here from a comment on Expedition Evans and look forward to watching your journey. Liked, subscribed and rang the bell!

@SailingAurora

3 жыл бұрын

Hi James. Welcome to the channel! Yes we are also following Expedition Evans, what an amazing job they have done! Stay safe, Chris & Tanja

@comsunjava

3 жыл бұрын

@@SailingAurora Yes, amazing job. I recall Sailing Uma's Kika and Dan also did quite a bit of work reinforcing and improving the grid on their Pearson 37, and no question it was a good boat to start with, but now even stronger. I'll have to mention Leo Sampson, who is restoring a wooden pilot boat "Tally Ho", but similar concepts apply. I definitely would be interested in seeing a comparison of the various techniques / tradeoffs.

Hey Chris, you will be getting some of the 'Expedition Evan's' crew over here soon :). I am so pleased to see the work going ahead and being done correctly. I believe you are correct in saying you will have a better boat at the end of this process. Hypothetically if I was to choose your boat new for your proposed round the world journey or after its repair I would hands down choose it after the repair.

@SailingAurora

3 жыл бұрын

Hi Paul. Yes, we also find it very interesting to follow and compare the process with 'Expedition Evans'. We wish it hadn't happened in the first place, but you are absolutely right, the boat will be stronger when done, so overall it's a bad situation that will have a positive outcome. Cheers Chris & Tanja

@stanthology

3 жыл бұрын

@@SailingAurora I'm an Evans subscriber too. Just found you and subscribed today. Avocet is good too. And Mads of course! Uma! Is that huge hose vacuum air or pressure air?

@danerlich7393

3 жыл бұрын

unfortunately ... these boats are VERY poor candidates for real tough off shore work - they are at best coastal cruisers not real off shore boats.. When the going gets tough out there and the compromises in design - ballast displacement ratios etc. show themselves - these boats go up for sale after ONE passage... There are many boats that made it to Tahiti and then go up for sale... boats that should never have ventured out on passage in the first place... The exact same thing is true for Expedition Evans... it will be educational to watch them venture off shore with that boat and see how they fare... VERY educational... There is a big difference between a production boat and a boat built and designed for real off shore work... Experience is a CRUEL teacher..

@Paul_Crosbie

3 жыл бұрын

@@danerlich7393 Just a thought there is another side......the POSITIVE side.......Beneteau Boat, Novice Sailor who goes on to travel the globe, meets girl, falls in love, then goes on to create the worlds most successful KZread sailing channel 'Sailing La Vagabonde' .......Experience LIFETIME OPPORTUNITY LIVED NOT LOST. (Outremer 2017 - present). Over 1.5Million Subscribers I am sorry you see Experience as a CRUEL teacher.. As a fellow Australian I am proud of Riley and how he started out, in a perfect world I would not have chosen a Beneteau BUT that's the point we don't live in a perfect 20/20 world with KZread perception and hindsight about everything. A good deal on a boat came up and the rest is history. Are Expedition Evans going to be 'schooled' by your CRUEL teacher, I hope not, but it certainly seems there are many like you who simply can't wait for that chance which is rather sad. There will always be risks and there will always be boats better suited to certain conditions. It is up to each individual to weigh those risks and plan their voyages around this great planet accordingly, taking into account their knowledge and ability along with the capabilities of their vessel.

@joskojansa1235

3 жыл бұрын

@@Paul_Crosbie Heh, you chose Vagabonde as comparison to circumnavigation. KZread allows them as the Wynns, to sail when they choose. Thats not sailing. Thats making videos on a sailboat. And yes, experiance is a very very hard teacher. Ask anyone that lost a boat and survived. I did.

Phantastic Video and information.

@SailingAurora

2 жыл бұрын

Your welcome

Very nice vid- as an owner of a 458 I love to see the technical side of our boats

@SailingAurora

3 жыл бұрын

Thank you so much, glad that you like it. Cheers, Chris & Tanja

I like your attention to detail.

@SailingAurora

2 жыл бұрын

Thank you

Nice progress - keep at it!

@SailingAurora

3 жыл бұрын

Thank you, and thanks for following. Cheers, Chris & Tanja

Just stumbled on this and subbed. It looks like there’s a lot of history for me to catch up on, which I’m really looking forward to. Best wishes. David

@SailingAurora

3 жыл бұрын

Hi David. Welcome, hope you will enjoy the videos:-) Cheers, Chris & Tanja

I rebuilt an old CAL34. Already a strong boat but I added several layers of fiberglass to every joint I could access, on the recommendation of a surveyor. Now it is as stiff as a board. Zero flexing. Gives me a lot of confidence offshore

@SailingAurora

3 жыл бұрын

Hi Stephen. Yes, the only thing that is positive about this situation is that the boat will be stronger when it comes out of the workshop. Cheers, Chris & Tanja

Thank you kindly, awesome explanation!

@SailingAurora

2 жыл бұрын

Thanks, more than welcome

I'm following another channel called Expedition Evans and they bought a salvage beneteau that also grounded causing the same damage as yours, they did exactly the same stripped the bonding and laminated everything back in. they did it themselves, you're lucky you got someone to do it for you

@SailingAurora

3 жыл бұрын

Hi Werner. We are also following Expedition Evans and the fantastic job that they are doing. Ours is an insurance case, so yes we are lucky that we have professionals to do it. Cheers, Chris & Tanja

Thanks for the videos guys. My heart bleeds for you watching this. Also seen the Expedition Evans ones recently. My father had a Beneteau Oceanis 54 which was in charter in Turkey and had it grounded. Was very painful to see back then too. Im sure it will be built back stronger if you get it all epoxy glassed back in rather than bonded.(Dont know why they still do that tbh after seeing Cheeki Rafiki...but at least you have a nice large keel bolt plate in there.) I have a Jeanneau 349 with swing keel. Comes with its own challenges. I hope if (and probably when) I ground it the keel swings back like its supposed to. Only held on with 4 bolts (2 each side) through a threaded transverse keel swing shaft. All the best. Fair winds. David

@SailingAurora

3 жыл бұрын

Thanks for the comment, always nice to hear what other people are going through aswell. The expedition Evans one has been really interesting to follow, can't say I agree with everything they did, but they did an awesome job. A grounding is always painful. Cheers, Chris

Some great info on production boat construction! Cheers.

@SailingAurora

3 жыл бұрын

Hi there, Thank you so much, glad you found it interesting! Stay safe, Chris & Tanja

Great video. Thank you.

@SailingAurora

3 жыл бұрын

Thank you so much, glad you liked it. Cheers, Chris & Tanja

Glad you're doing it right!

@SailingAurora

2 жыл бұрын

Thanks, she feels really strong nowadays

Great video!

@SailingAurora

3 жыл бұрын

Thank you Patrik:-) Cheers, Chris & Tanja

You shouldn't need a thru-hull for a bilge pump. It is normal practice to discharge through an open port in the transom above sea level (with a flapper/check valve to prevent backflow). The pump should be more than capable of lifting the flow to the required level. Either way, you don't want a T to restrict flow. You should have a dedicated hose (with no connections or restrictions), end to end for both manual and electric pumps.

@SailingAurora

3 жыл бұрын

Hi Stephen, thanks for the advice. I am still thinking how best to do it. It may not be easy on the transom. Watch this space. Cheers, Chris

VERY instructive. Sincere thanks :)

@SailingAurora

3 жыл бұрын

Hi Mike. Thank you so much, glad that you liked it. Cheers, Chris & Tanja

Thank you! Very helpful.

@SailingAurora

2 жыл бұрын

Welcome

You are very good at narrating, keeping it interesting and informative. Well done! On the subject matter, I am surprised to see that the problem with a delaminating grid structure, is more common than i thought..

@SailingAurora

3 жыл бұрын

Hi there. Thank so much for the kind words. Hopefully this will be the one and only for Aurora. Only good thing about the situation is that she will be stronger when she comes out of the workshop, AND we learned a lot about her on the way. Cheers, Chris & Tanja

As Chris says, most modern boats have been built this way for a number of years. HR use a similar grid frame that is bonded (whether it's over laminated I'm not sure, in some pictures it doesn't look like it is). You have to remember the energy involved in 12 tons of boat travelling at (let's say) 6 knots meeting a solid object like a rock. If you think of a car analogy and you have an accident, the chasis is always checked afterwards, this is the boats "chasis". This is why the ORC are now stipulating hull condition checks before offshore races, especially after cheeki raffiki and it's various repairs. Modern boats / keel designs are fine for all the conditions they will encounter at sea, but not designed for significant contact with the land or immovable objects. The important thing after damage is the integrity of the repair and this job looks to be very thorough. Get those wires and some spare mousing lines in whilst you can Chris ;-)

@Adrian-sail

3 жыл бұрын

You guys are wrong about Hallberg Rassy they do not rely on the grid to support the keel, their hull forms a deep flange at least 200mm often deeper the keel is then bolted to this, i have seen a HR 64 after hitting a rock at 8 knots the keel and joint was still good the was damage was along the hull as it was well heeled over when the collision happened and the hull scraped along an adjacent rock but not bad enough for water to penetrate. As someone else has said buy a secondhand HR any day over one of the mass production new builds , If you are serious about Sailing offshore..... Here is their latest 40 footer see the stubby Flange....... www.hallberg-rassy.com/fileadmin/user_upload/HR40Cinteriorsideview.jpg

@SailingAurora

3 жыл бұрын

@@Adrian-sail www.hallberg-rassy.com/resources/how-a-hull-is-built/. I'll just leave that there, I guess some of the Rassy's are built with a grid. Maybe different with each model

@steampunk888

Жыл бұрын

You guys are insisting that keel repairs are a part of life, when you perhaps should insist that design changes are in order. A bolted keel on a dropped-in frame is a great way to have a boat that's almost never at sea. Groundings happen every single day of the year.

@matts_sailing

Жыл бұрын

@@steampunk888 “a bolted keel on a dropped in frame”……you mean like pretty much every modern production boat built over the last decades…literally thousands of them sailing all over the world and crossing oceans.

Awesome video. Tnx!

@SailingAurora

6 ай бұрын

Thanks very much :)

Very interesting and informative. I only avoid bolt on keels because they seem to always have big vulnerable spade rudders, but there is so much more to this.

@SailingAurora

3 жыл бұрын

Thanks, appreciated. Yup, there are so many arguments for and against. I don't like the vulnerability of the rudder, but the way it's designed is superb, when sailing the feel is second to none. We fell in love with it the second we sailed the 388 for the first time

@philgray1023

3 жыл бұрын

@@SailingAurora Our sailing area is notorious for groundings. We had an encapsulated keel and skeg hung rudder which meant when the inevitable happened I was never too worried. Now we have two rudders and centre board so if we ground it just lifts up. I'm not a steering fan and use autopilot a lot. But friends that helm might not like the twin rudder set-up with its mushy feel on some points of sail.

@SailingAurora

3 жыл бұрын

@@philgray1023 Totally agree and good plan

Same story like Expedition Evans. Hmmm, interesting.

@brianluck84

3 жыл бұрын

Saillife had to glass his grid too

@RobbZinn

3 жыл бұрын

@@brianluck84 Yeah but his was a totally different reason. He got water into his core so he doubled up the glass on the grid to not have to remove the core and redo it.

@SailingAurora

3 жыл бұрын

@@brianluck84 Good old Mads, love the channel

@SailingAurora

3 жыл бұрын

@@RobbZinn Very true

The more I see this grid issue in these the more I'm glad I'm rebuilding a older Newport.

@SailingAurora

3 жыл бұрын

Can't blame you, good luck with the rebuild

@PennWolfsSailingAdventures

3 жыл бұрын

@@SailingAurora Thanks you too. I'm going to end up pulling my floor up to check mine too, but going to make it accessable incase I have a grounding issue as well.

The quality of the bilge hose is as important as the pump. I changed out my old (corrugated) hose for a smooth bore (on both electric and manual pumps) and either can now empty the bilge in a fraction of the time that it used to require (for the same size pump). There is a world of difference between lamina flow and turbulent flow.

@SailingAurora

3 жыл бұрын

Great comment, thanks for the tip. All of our pipes are smooth and steel reenforced. Just have to buy the bilge one soon, will keel this in mind, thanks

The bonding, if done with quality materials, is very good practise, the reason that Hanse is in business is because they choose the best, most economical way to build. This collision is about as bad as it can get without holing the hull. I can so empathise with feeling confidence in the tradespeople. Looking forward to seeing this completed.

@SVImpavidus

3 жыл бұрын

Well said

@SailingAurora

3 жыл бұрын

Thanks Phillip, as always appreciated. I agree completely. I touch on this a little in the video released today. Cheers, Chris

@rosewood1

3 жыл бұрын

This is months of hard work to repair. Very comprehensive which it needs to be. Thanks for sharing. The bonding is not much better than filler. It's glass without the reinforcing glass. By the way epoxy will bond onto polyester. But polyester won't bond onto epoxy. I also incorporate carbon fibre into high stress repairs and have found that by the time I have finished the repairs are massively strong.

Bilge pumps. You absolutely need an upgrade here. That pump is a clearing pump only, i.e. it is designed to get very close to the bottom of the boat to clear the last few gallons. If you are heading offshore my advice is to fit 2 fully independent pumps with separate outlets (T 2 hoses together at least halves the pump output). Arrange the switches so that one comes on a couple of inches higher than the other. The idea is that the first one is the 'working pump' and the second one kicks in when the first one fails, clogs or is overwhelmed. Because the second pump normally stays dry and unused it is more likely to work when you really need it. Also rig a loud alarm to the second pump, if it goes off you know you have an emergency. A good idea, but not essential, is to use the same model for both pumps, that way you only need one spare. When sizing the pumps look at how much water can come in if a sea-cock, rudder seal of prop shaft seal blows. Your pumps need to clear water fast enough in that event for you to make a repair. Personally I would not consider anything less than 2000gal/hour (for each, not total) as a bilge pump on any boat that is going offshore. I have always fitted 4000g/hr and under test these will keep the sump clears if you open a 1.5" sea cock but they will be working close to capacity to do it.

@SailingAurora

6 ай бұрын

Hi Roland, thanks for the tips. In the later videos you can see that I installed exactly that, I had to run another pipe, which was abit of a pain but got in done. Cheers

You sound just like Korg, great vid

@SailingAurora

3 жыл бұрын

Thanks:-) Cheers, Chris & Tanja

Hi Chris, another great episode. I like your recaps a great deal, very professional. Not much to say this time. Glassing in the repair areas is proper. You make a distinction between a production boat (bonded grid) and a "custom" boat (glassed grid). You will mislead folks that don't have a good understanding of boat building. The vast majority of sailboats are production boats, meaning a company is making the same hull and deck over and over, from a mold. A true custom boat is when you go to a naval architect and tell them you have an idea for a sailboat and you want them to design it. Then you take the drawing from the architect to a boat yard and say here, build me this boat. There is a middle, or semi-custom boat. Make no mistake it is a production boat but the customer has a great deal of input on interior design and layout, hardware selection and so fourth. With a semi-custom, or production boat the customer is never given a choice of bonded or glassed grid. Moody and Hanse are under the same umbrella that is why you will see some Moody design and innovations in the Hanse. Moody is a production boat, it is a semi-custom. Hanse bonds their grid, Moody has a glassed in grid. Amel production boat without much input from the customer, glassed grid. Sirus a small german maker of of some fantastic sailboats. They only have 3 boats in there offering 31, 35, and 40 foot. There boats are semi-custom, the customer has a great deal of input. All their boats have a glassed in grid. Bonded grids are safe, strong, and work well except when they don't. Would I exclude a boat maker from my list of what new/used boat I am going to buy based only on how the grid is secured. Yes, I would, I guess I am a bit OCD about that. OCD and bilge pumps. I hear and understand you mate. For what it is worth. Get the best and highest capacity pump that will fit in your bilge. Matter of fact, get two. The bilge pump thru-hulls being above the water line is not as critical of material used, as those below the water line. Having a seperate thru-hull for each of your 2 or more main bilge pumps is the way to go. You are doing very well, I like to watch as your knowledge base increases. Here ya go use a sealant when you want protect from water intrusion. Ues an adhesive when you want to attach something to something. On the keel, it is 3M 5200 adhesive. There is no other choice that compares. Those guys at 3M have an "unofficial" slogan about 5200, it goes like this. "What 5200 puts together, no one but God takes apart" Be happy, be safe.

@SailingAurora

3 жыл бұрын

Thanks for the good insight Larry, sounds like you have got a hell of an experience. Being at Plastskador has really taught be a lot about bonded and glassed grids and I would have liked to have know it before looking around to buy a boat.

The second bilge pump is a definite Go Ahead. The one you have is way too Pussy for a boat of this size and investment. A separate hose and discharge port is a definite Yes. I also do not like standing water in my bilge--always want to determine how it got there?!-Mikey, Belfair, Wa, USA

@SailingAurora

2 жыл бұрын

My thinking exactly. I just need to mount an anti syphon valve at some point in the pipe. Since this video the bilge pump is mounted and will work well I think. Thanks for the comment

I just found your channel. If you've never seen his channel, Mads (Sail Life) has an amazing channel and he's just about completed a near complete rebuild of a Warrior 38.

@SailingAurora

3 жыл бұрын

Hi and welcome to the channel! Thanks for the tip, we follow Mads as well, he is doing an amazing job. Cheers, Chris & Tanja

Thanks for the in depth! Die nut is the term in Oz. For cleaning a damaged thread. I plan to build a cat yet all boat repairs are educational.

@SailingAurora

2 жыл бұрын

Thanks Jason, much appreciated

My partner and I have been watching every episode as we have a 418 on order. I can’t tell you how excited we are about picking her up from Greifswald later this year! It was shocking to see the damage done to Aurora and the wait to get her fixed must have seemed interminable for you! The repair looks to be very thorough and the yard have done a great job thus far. I’ve been wondering how those cutout sections will be reinstated, but ensuring the grid is a strong as it once was. I guess I’ll just have to be patient to find out, but am looking forward to following the numerous stages of the repair. With the grid glass bonded to the hull, Aurora is going to be extra robust! It’s also nice to get sight of the anatomy of Aurora, so we have an understanding of the hidden bits of our 418, when we need to take things apart. I don’t agree that production boats are poorly put together - the build quality looks as solid as the rest of what we saw when aboard two other examples. The damage to your boat looked bad, but sailing 12 tonnes of yacht at 6 plus knots into a rock will do serious damage! I wonder whether you can get the track data off the plotter as there should be specific speed and direction information for the collision. You’ll need some sort of .gpx file reader software. Just one question: I notice that you have a 3 bladed Flexofold prop. What engine size do you have fitted to Aurora? Best of luck Chris and look forward to seeing the boat out on the water again! 👍

@stuart7060

3 жыл бұрын

Good luck with the new boat. My 458 has just come out of the factory and is being inspected today! I based my 385 at Greifswald for three seasons so feel free to PM me if you want any advice about the commissioning process there.

@SailingAurora

3 жыл бұрын

Hi Peter. So exciting for you! Hope you will have a great sail to your home on your new Hanse 418, it is such a special feeling leaving in your brand new boat! Yes, the wait felt endless, but now we can see an end on it all, and just looking forward to the new season. All the best, Chris & Tanja

thank you dude

Hi Chris, thank you for another very informative video. Lets hope that Aurora will indeed inherit some benefits of a custom yacht! On the subject of the new bilge pump, Johnson quotes 4 times more flow than the stock Xylem (Jabsco). It is however double the height of the stock pump (216mm vs 111mm) so I doubt it can fit under the floorboard. An alternative that I am considering is to fit a second Xylem pump close to the original one, that only activates once the original pump is overwhelmed. In addition, it might be a good idea to install a 3rd pump in the forward cabin. Water could go anywhere when you are sailing. In any case, the through-hull should be above water level at all angles of heel. But the higher you go the pump's performance will be dramatically reduced, so I think the best option is what Hanse already does, i.e. take the hose aft, right below the platform opening. btw I am planning a transatlantic voyage in a couple of years by joining the ARC rally in November 2023. If this may trigger your interest and fix a date, just think about it! All the best

@SailingAurora

3 жыл бұрын

Hi Aristides, No worries, happy to share, she will be very strong when finished. Thanks for the info on the bilge pump, I purchased the Johnson yesterday actually, I measured it and it will fit. It might sound like a stupid question but can I ask why you need the bilge pump to be out of the water at all angles of heel. I was thinking that if I put a big enough U bend in it, it should be fine, also there will be a none return valve on it. I'm not saying your wrong, just want to know the thoughts behind it as I am still deciding where to run the hose. Also a good idea with the bow bilge pump, it maybe a future project. Sounds great with the ARC rally, are you asking for crew or another boat to join? I am definitely interested. Cheers

Hope the repair turns out well. I'm sure it will be beautiful again by the end of this process

@SailingAurora

3 жыл бұрын

Thanks very much. I'm sure she will be great

Thank you for your showing other repairs in your last video....its amazing how much the manufacture's cut cost by using bonding materials in key strength area's...to keep costs down....as they say in many things (TIME IS MONEY) 😠 instead of quality ...😢 and care of the final product....🤔

@SailingAurora

3 жыл бұрын

Hi Bruce. Thank you, glad you liked the video. Yes, you are definitely making some trade off when buying a production boat. Cheers, Chris & Tanja

Put a 30mm condut across in the grid then you will have space for wiring later

@SailingAurora

3 жыл бұрын

Thanks, exactly the plan:-) Cheers, Chris & Tanja

Great video,keep it up!🛳

@SailingAurora

3 жыл бұрын

Thanks! Will do!

Glad to see things going well. Great explanations. You and RAN2 really make sailing in the Swedish archipelago really attractive.

@SailingAurora

3 жыл бұрын

HI Keith. Thank you, yes there is light at the end of the tunnel. It is in deed a very beautiful place to sale. Stay safe, Chris & Tanja

I totally agree on the comments on how the stringer is bonded to the hull, but the real problem is about the quality of the adhesive used. Use a polyester/vinyl-ester bonding paste

Wow this is unbelievable, how much work this takes. How much is all of this going to cost??? Great drone shots and content. Keep up the good work.

@SailingAurora

3 жыл бұрын

Thank you Jason. Yes it's really extensive work. The estimated cost is € 40k. Best, Chris & Tanja

Very interesting getting into the various build formulas, I own a a custom built low production power yacht 650k for 38' and even though it was a low production there are still items that suprise you. I like that you have pointed out that in general its also true car production up and down a manufacturer line many similar parts. My beef is that many of these parts are lower quality made in china which I understand but not getting the mark up on crap parts. Bilge pumps - I obsesse as well no water but interestingly I have 6 bilge pumps.

@SailingAurora

3 жыл бұрын

6 bilge pumps, wow! That's awesome, now I can justify the cost more easily to myself. Thanks for sharing

@keithhall9298

3 жыл бұрын

@@SailingAurora I use a dry bilge system from seaflo price varies 180-300 gets everything out - everything

you are passing through what @Expedition Evans passed, they got a damaged boat and there are tons of videos of all their work to re-laminate a grounded Beneteau.. good learning channel of how the boat is built

@SailingAurora

3 жыл бұрын

Hi Miguel, yes we have been following their channel closely and it's really interesting. I wish I could be down at the yard all of the time to really share it like they did but I have to run another job as well. Hope you are enjoying both channels. Cheers, Chris

Keel bolts tend to be cast in lead, and drilled/taped in iron.

Interesting!

Great video, interesting to see the work being carried out. That is some bilge pump you are looking at installing, 258l/min - just looked at the spec for mine, a Johnson pump, a miserable 16l/min, I think a bucket might be quicker.

@SailingAurora

3 жыл бұрын

Hi Barry. Thank you. Not a great situation, but we are making the most of it, by learning a lot about our boat and from people at the workshop along the way. And yes that is some bilge pump. Chris just picked it up today and decided to test it in the kitchen - not the best idea he have had:-) It can really move some water that pump. Think it will be a great addition to the existing bilge pump. Cheers, Chris & Tanja

@caylieanddavid

3 жыл бұрын

@@SailingAurora Ha. I can imagine the kitchen. I bought a 4000GPH a couple of weeks ago as a backup but am planning to use 2” layflat hose and not install it permanently

Well made video. This is a major repair that most boat owners hope not to be faced with. You've turned it into something positive. Could you share your general budget and time needed to get this done?

@SailingAurora

3 жыл бұрын

Hi Jeff. Thank you! Yes, and we could never have imagined that we would have to go through this with a bout not even 2 years old:-( But we are trying to make the best of the situation. Yes it is a major repair, it's estimated at 400 work hours, so 10 weeks of work, and at a final cost of €40,000. Stay safe, Chris & Tanja

Just checking your video first time .I’m restoring old classic Irwin37cc YT “sailing Envera” .Testing for bildge pump show Ryle in practical sailor magazine best for pushing water flow few meters high in air.I’m installing 3 with separate hoses for making better flow if they need to pump out.Also manual emergency pump and one for flood on generator 110v.shame they didn’t fill properly keel to stick there.In US we use 3m 5200 for permanent bond.My opinion regarding true hulls you have 2 companies true-design NZeland and Forespar Marlon but I like Truedesign better just look well made and that will be also my go to product except engine intake because vibrations from it. Wish you good luck with projects Check also Divinycell foam to put on bottom around keel to stiffen area more,you will need one sheet 3/4 to cut in pieces and stick and laminate but it will be much more support for flexing.Best regards from Fl

@SailingAurora

3 жыл бұрын

Thanks so much for the tips, it's on my to do list to research through hulls this week at some point. You have some good ideas with the bilge pump also, gives me more food for thought. Cheers, Chris

Only February, and we have a strong contender right out the gate for the best sailboat KZread video of 2021. (It's a mark in your favor that you didn't have a thumbnail of a 20-something in a bikini.)

@SailingAurora

3 жыл бұрын

Cheers, Eric... I'm not sure I am that good but trying my best to deliver some good content to on KZread. The only reason there were no bikini's was because there were none around :) I will try harder next time. Jokes aside, it does get to me sometimes when all you see is click bait on KZread. All the best, Chris

I’m coming from the carbon fibre world where when you bond two pieces of carbon fibre together using Methyl Methacrylate you’re not able to break that seam before you actually crack the cf laminate first. I’m curious to understand what is the bonding material used in boats like Hanse? Methyl Methacrylate should bond equally as well to glass fibre. I believe you got the it backwards regarding polyester being stiffer, that is not the case. Tensile strength in epoxy is higher than polyester. Great video. Interesting to see the work carried out by these guys.

@SailingAurora

3 жыл бұрын

Hi there, thanks for the comment. I'm not sure what was originally used by Hanse. I have been doing quite a bit of research on Epoxy and Polyester over the last couple of weeks. These videos have caused quite a stir. As you probably know, tensile strength is the breaking point of a material, I beleive Epoxy excels in this partly because of it's flexibility or deflection. Wheras stiffness is the amount of deflection of the material. Polyester is less flexible. Thanks for the compliment, the repairs are going well so far. BR Chris

You mentioned that the keel of your Hanse 40' was bolted through just 10mm of hull fiberglass. It is insightful to contrast current boatbuilding practice against 1980's boatbuilding practice. My 1985 Pearson 36-2 has a 10mm thick structural grid of longitudinal stringers and lateral ribs. The grid extends up above the heeled waterline, and the grid appears to be bonded to the 10mm thick hull with 5200. The strength of the grid is such that the shroud chain-plates are bolted to the grid where its top edge is heavily glassed to the hull. The grid also extends down into the hull's keel stub & bilge. Consequently, the external lead keel is bolted through both structures comprising at least 20mm of fiberglass.

@SailingAurora

2 жыл бұрын

Hi Ash, since making this video I have notices that the hull varies in thickness, it's only parts that do not need to be that strong are fairly thin to keep the weight down... which is understandable. Around the keel the thickness from factory is significantly thicker that 10mm and is very strong. It's true, they did make them like Tanks back in the day

Proper keel bolts have the shape of a traditional umbrella handle, or the letter J. You cannot just unscrew them out from the keel.

You experienced the reason I will only own a full keel boat. I know of dozens of fin keels boats that have suffered this same damage. 9 out of 10 never make it back to the water. Those boats include models of every manufacture you mentioned at the beginning of your video.

@SailingAurora

3 жыл бұрын

I can't blame you if you want a full keeled boat, they are very robust. Fin keel boats are definitely prone to this damage, up here in Scandinavia as we have a lot of rocks, it's a common occurrence to run aground and there are a lot of companies doing this kind of repair. I guess the insurance companies assess if it's a write off or not before paying for the repairs.

@Garryck-1

3 жыл бұрын

My attitude is, fin keels and spade rudders are unseaworthy, period.

@benrandomly2016

3 жыл бұрын

@@Garryck-1 Yes, I agree.

@stephenburnage7687

3 жыл бұрын

It's not fin keels that is the issue but bolted on keels. A fully encapsulated fin keel is as strong as a full keel, with none of the disadvantages. Old 70's and 80's boats with fully encapsulated fin keels have been grounded many times with none of these issues.

@Garryck-1

3 жыл бұрын

@@stephenburnage7687 - Fair point. But those are not (and haven't been for a long time) the kind of keels being churned out in huge numbers by manufacturers, and sold to an unsuspecting public, are they?

Swing keel problem solved !! couch captain 👍😁

@SailingAurora

3 жыл бұрын

Would love one, a little out of my budget though :)

ahoy ⚓️ very well documented! I have one more question: is the damage insured? And what does the repair cost? thanks for replying. Lg. Stefan from Switzerland 🇨🇭

@SailingAurora

3 жыл бұрын

Hi there. Thank you! Yes the damage is insured, thank g.. for that. The repair will cost €40,000 incl. VAT of 25%. Stay safe, Chris & Tanja

Expedition Evans bought a grounded boat and repaired it themselves. Same issues.

@chrisevans7416

3 жыл бұрын

And they consulted pros and used epoxy ,not cheap polyester

@SailingAurora

3 жыл бұрын

Hi Bill. Yes, we are also following Expedition Evans. They have done a great job!. Cheers, Chris & Tanja

@SailingAurora

3 жыл бұрын

@@chrisevans7416 There are different applications for Epoxy and Polyester, if applied correctly Polyester is more than adequate, I will cover this in the next video and explain a little of why epoxy was not used. Plastskador has been around for 30 years and is well known all over the Nordics for quality repairs, they also do a lot of the work for the major insurance providers, I've done my research and they know what they are doing.

@chrisevans7416

3 жыл бұрын

@@SailingAurora Mine was done by a custom yacht builder of 50 years from Holland and done in Canada. Epoxy is stronger to an already cured structure . Boats are not made out of epoxy only due to costs. Vinylester is a compromise in strength and is better resistance to water and cheaper than epoxy.I'm sure your boat and most production boats are vinylester I'm sure it will be fine and they know what they are doing ,however then why the adhesion tests? . There are many tests on youtube boatworks today for example. I had 3 well known boat repair yards quote on my boat and they all said epoxy, just saying ,done by insurance with a surveyor hired by them

@SailingAurora

3 жыл бұрын

@@chrisevans7416 Sounds like you had some good boat builders too. The adhesion tests were for a few reasons.. 1. Because why not before you commit to the whole hull 2. To double check there are no unwanted chemicals anywhere such as silicon, diesel etc. this is really bad.... and 3. Testing the sanding depth for the adhesion. Probably unnecessary but doesn't take long to have a double check before the commitment.

very nice and have a hole there, I would actually have one on each side so it will be aerated

@SailingAurora

3 жыл бұрын

Good idea, and there will be 2 holes there, but we need to be careful not to do too many as it needs to be the strongest place on the boat pretty much. Chris

Whale bilge pumps are also nice

@SailingAurora

3 жыл бұрын

Hi Jon. Thank you for the tip. Already bought the other pump. But maybe a Whale next time, got a tip on having three of them... Cheers, Chris & Tanja

The fishing boat had a y valve in the bilge,it could suck salt water through a throughhull for washdown or y valve to bilges for sinking,kept us running for hours till we ran the boat aground under the lift at the hall out yard….

@SailingAurora

2 жыл бұрын

Sounds like a good solution, I thnk when/if we leave for an ocean crossing I would like some connection to the engine water pump also

I wouldn't buy a production boat. Ever. I really do struggle with bolt on keels. I have grounded a few times and my well built solid keel took it in its stride. Grounding is a fact of life on a sail boat and I just can not get my head around compromising the integrity of the boats structure. I love the look and finish of these boats but think this is a flaw that needs be addressed.

@SailingAurora

3 жыл бұрын

Hi Steven, you have some fair points and I agree somewhat. Nowadays people are looking for performance also and full keels or longer keels are just a little slower. I guess the solution is to never run aground but we both know that is unlikely. A company called Linjett in Sweden has a good solution with a swinging keel in the event of ground, but I sense problems there also. BR Chris

@davidclarke7728

3 жыл бұрын

That’s o k if you can afford hand built

@GaffLife

3 жыл бұрын

A laminated fin keel with internal lead ballast would be nice.

@steampunk888

Жыл бұрын

Your instincts about bolted keels are quite correct. It will probably recede as a technology, and its main purpose was only to make sailboats available at a lower price point. It has been, overall, a debacle.

@iansenior9759

Жыл бұрын

Boat maintenance and repair is expensive. I doubt I'd buy a small cruiser but if I did I'd favour a Victoria 30 with full Keel and encapsulated ballast. At least you know its not going to fall off and the Hull design is seakindly. I remember the story of Drum in the Fastnet which suffered Keel failure and flipped over. Beneteau and Dufour are the same with a bolt on fin waiting to snap or fall off.

This is the trade off for fibreglass boats In the end isn’t it? They’re much cheaper and lighter but less solid if something does go wrong... Enjoying watching the work done anyway as every boat material has merits and they’re all interesting.

@SailingAurora

3 жыл бұрын

Hi Alistair. Glad you enjoyed the video. And yes there are always trade off's:-) Cheers, Chris & Tanja

For a steel boat sailor, very interesting to see! Through hull fittings: With collars around 'plastic' valves, like supplied by several, valves are accepted by for instance USCG. Bronze will last for ever in sea water. I myself removed valves/seacocks from sv Venus, at that time 110 year old original Collin Archer. Material was by spec. 'Admirality Bronze', that in fact is a sw resistant brass. Same material in keel bolts on this vessel. No corrosion, no damage, appart from wear. The boat was built in Larvik, commisioned to Bergen. Sea water all her life. Now in Oslo, Maritime Museum. Still sailing.

@SVImpavidus

3 жыл бұрын

They are not Plastic www.trudesign.nz/marine/certifications/1-seacocks-and-through-hull-fittings

@svhulda6157

3 жыл бұрын

@@SVImpavidus I know, that's why I used 'plastic' with '' :-) Just to mark that it is not metal or steel.

@SailingAurora

3 жыл бұрын

Thanks for the comment, interesting stuff. I'm still thinking it over abit

Thanks Sailing Aurora. You mentioned brass versus plastic seacocks. Like you said plastic seacocks have the potential of shattering under an impact load. The reason for this is some seacocks are made of cheap plastic with a poor fracture toughness. The cure is to force the seacock manufactures to build out of more expensive plastics with acceptable fracture toughness. Fracture toughness is a materials resistance to cracking under impact load. I am sure there must be manufactures who build seacock with very good plastic parts. Any suggestions from the other readers. Good luck with the rebuild.

@SailingAurora

3 жыл бұрын

Thanks for the comment, we are going to buy True Design composite ones now, they should be good. Cheers, Chris

@bobbyrayofthefamilysmith24

3 жыл бұрын

Some plastics are stronger than metal

Brass has to be protected against galvanic corrosion. Plastic turns brittle.

@SailingAurora

2 жыл бұрын

Thanks Stephen, the new ones I put in are composite from Trudesign. Highly recommended

Thru-Hull fittings and taps, the general rule that most of us follow in tropical waters is to change them every 7 to 10 years whether Bronze or Plastic. the fitting materials usually outlast the ball valve area of the tap. The ball and internal face usually fail and seize (thru poor maintenance) before serious corrosion problems. Some English made valves are made for pull-apart maintenance, expensive but worth a look, for a much longer service life than 10 years. I only have 2 thru-hulls, one for in and one for out, I run a manifold system on my custom built boat.

@SailingAurora

3 жыл бұрын

Hi Stuart, thanks for the advice, really appreciate it and learning everyday. Right now I am looking at TrueDesign stuff, it looks pretty good. Not sure how long term testing they are though. CHeers

After digesting 20% of the comments my intention to build my own cat remains just as sure as before. Great inspiration!

@SailingAurora

2 жыл бұрын

Hi Jason, that's great. I hope you are well on the way to building it

Sailing Parley is a good video to watch ! Repaing poor bulkheads caused by cheap production fabrication !

@SailingAurora

2 жыл бұрын

Yup, Colin and the crew did an awesome job on that boat, really enjoy watching the channel

Maybe someone mentioned this in another post, but, have you had the engine brackets holding the motor in place checked? They usually take quite the damage when running aground, just food for thought.

@SailingAurora

3 жыл бұрын

It's one of the fist things the repair guys mentioned. They went through the entire boat looking for damage and the engine mounts were checked, they are fine. Thanks for the tip :)

Would you be able to provide the grounding details? (Speed at time of grounding, what was hit, weather, etc). It appears this was a significant event. If this is covered in another video I look for it. Thank you!

@SailingAurora

3 жыл бұрын

The weather conditions were fine, I have the track but I need to find out how I extract the data from the Zeus3 chart plotter for speed. For sure it was a rock they hit, you can see the track on Ep36. No worries, I will do some investigation tonight, I would love to find out also, BR Chris

I've heard of a tee valve being added to the engine cooling system to suck in bilge water in an emergency to augment the bilge pump. Personally, I don't think that would add much. Better to add another bilge pump for more throughput AND redundancy.

@SailingAurora

3 жыл бұрын

I think Sailing Nahoa did a test on this also. The throughput wasn't that great. Would be good as an extra though I guess

Good job, I hope you succeed. Where do you repair the boat?

@SailingAurora

3 жыл бұрын

Thank you. The boat is being repaired at Plastskador & Montage, Svinninge Marina, Sweden. Cheers, Chris & Tanja

that's why I'm searching for a steel boat...

Smack tarred that one, ouch.

You can use a t connector for a pump out but it must have a check value, and one that will not clog. Some pumps have check values built in?

@SailingAurora

3 жыл бұрын

Hi Michael. Thank you for your tip, will definitely look into that. All the best, Chris & Tanja

Have you watched 'Expedition Evans' where they are re-glassing the grid back after a grounding ?

@SailingAurora

3 жыл бұрын

Hi Andrew. Yes we are following Expedition Evans. They have done an amazing job, and really interesting to follow and compare to the repair Aurora is now going through. Cheers, Chris & Tanja

I have watched way to many videos of problems with production boats, I have been in the market for a 45'-65' sailing catamaran and I decided on an aluminum hull boat and I am building it myself.

@SailingAurora

Жыл бұрын

Sounds like an awesome project. I would love to learn Aluminium contruction and welding for sure, unfortunately only so much time in the day though :) Good luck on the project

@alexanderparkman4393

Жыл бұрын

@@SailingAurora I own a metal fabrication business so it's building aluminum structures is within the realm of what I do. I am going to either buy off the shelf plans for a boat or work with a naval architect to design my own from scratch.

you do not need a seacock for the big (or any) bilge pump, because the through hull has to be way up above the water line. Of course no T into the existing bilge pump line. Big hose, 1.5" and no check valve.

@SailingAurora

Жыл бұрын

That's exactly what I did, thanks for the advice though

I can relate. When cars went from a frame to a unibody construction they faced similar problems.

@philgray1023

3 жыл бұрын

Monocoque construction wasn't it, where they bolt the subframes to a tin box. My wife's car was written off by what literally looked like a minor panel damage.

Too bad about the boat. I'm in the same predicament on my own. My boat has had a really hard gronding a loong time ago. The problem is that the repair is delaminating.... descoverd this when i started to fix my osmosis problem... so no im considering buying a different boat. It's is an old boat... but im gonna follow your videos with great interest. Best of luck . Regards Jarle

@SailingAurora

3 жыл бұрын

Thanks Jarle, well that really sucks about your boat. When I am exploring at Plastskador and talking with the guys they have shown me a little of repairs that have gone wrong. Not a fun thing. I hope it works out for you. Cheers, Chris

The strength of fiberglass is long continuous strands of glass fibers laminated before the chemical reaction has cured.A repair patch stick on is just that a patch.When your hull flexed and popped the glued in grid structure the entire hull flexed and broke the fibers.Marelon fore spar thru hulls are inert and lightning proof along with non corrosive. Amel uses a sea chest for that reason as does feadship

@SailingAurora

3 жыл бұрын

Thanks for the explanation, I really like the sea chest idea with one thru hull to serve many, it's a good idea. Chris

Good investment? Would you do it again? Also I would replace the front keel bolts at least.

@SailingAurora

3 жыл бұрын

Hi Mark, I would absolutely do it again, minus maybe the chartering. I will see what they decide on but I will ask the question as these bolts took the most beating :)

I'm thinking what would happen to a boat with a fully laminated grid during a hard grounding? Would more damage be done to the hull itself?

@SailingAurora

3 жыл бұрын

Great question! I will cover this a little in the next video. I am told the damage would find the next weakest place and this usually further away from the keel and up the insides of the hull. I will try and find an example in the future.

@anthonyellis9804

3 жыл бұрын

@@SailingAurora I think the biggest problem is a 10mm thick hull