The bow wave you want to mitigate will vary depending upon the ships speed, sea state and wind. A fixed bulb can only be optimised for a single condition and in other conditions will actually be harmful. In any case, the mitigation will only be partial at best, so the benefits might be limited. For a vessel almost always travelling at a constant speed this might be acceptable. But for a vessel constantly changing speed and course, example a sailing ship or warship the benefits might simply be too small to justify the costs. For a small yacht the benefit might be very small ( the speed is low, the bow wave very small and the fuel is free and who really cares if sometimes you might go 0.1 knots faster ). An ideal bulb would be able to change it's shape to automatically adapt to the conditions, just like aircraft have swing wings. However making a 10?? ton shape shifting bulb might be way beyond practice, although perhaps this would be a good project for a naval design student somewhere.

@CasualNavigation

6 жыл бұрын

Thanks David. You are right, it would be a great project for a naval architect student - and I know shipping companies would buy it if it would save fuel!

@huss03

5 жыл бұрын

I would have thought that a bulb that can be made to move it's position forwards and aft depending on ship speed wouldn't be beyond the limits of engineering. Wouldn't that widen the window of speeds for which the anti-phase wave could be set up?

@davidjames1068

5 жыл бұрын

Moving the bulb alone, might not be enough to help. It might need to change size/shape as well. The key problem would be if the wider window of speeds gives useful savings at speeds actually commonly used by the ship.

@greeneggsandsam2014

5 жыл бұрын

david james As I understand, these bulbous bows are used mainly on large, ocean traversing cargo vessels, which do travel at mostly constant speeds at sea. Their main speed changes happen near land, and not where they spend most of their time moving through the water, the ocean.

@matthewhemmings2464

5 жыл бұрын

david james you can still try to aim at an optimal condition. The cost is marginal on the scale of large boats being built, and the drag is mostly affected by high speeds, so you can bet that optimizing the bulb for medium-high speeds for bigger ships is a sure way to go.

I believe it’s for mating reasons with the female ships

@johnclayden1670

5 жыл бұрын

all ships are female ...

@jakedragsknee

5 жыл бұрын

John Clayden did you just assume all boats gender

@ph89787

5 жыл бұрын

John Clayden Not entirely true. The Kaiser wanted some of the German ships to have male pronouns.

@Cleptro

5 жыл бұрын

Jake Fejer All ships are female.

@jamesavery6671

5 жыл бұрын

Female's can wear strap on's though...…..

My father, who was a navy man, always told me that this behaviour was found by accident. The first was build for sonar and it created a possitive increase of speed

@davidjames1068

Жыл бұрын

I read somewhere that they discovered this when they put rams on the front of early metal war ships. When a ram fell off, the ship was slower and someone went 'ah-ha!'.

@Nibby12

Жыл бұрын

Your Father was right. On Warships they are Sonar domes.

@sakuyaizayoi8946

10 ай бұрын

i immediately started chanting sonar when the video asked what the bulge was for, only now i learned it also on very specific occasions and circumstances helps with the waves.

@pizzlerot2730

8 ай бұрын

​@@Nibby12sorry but no. The bulbous bow predates sonar by quite a bit. The reason that it's used for sonar on warships is simply that the location of the bulbous bow is exactly where you'd need to put a forward-sweeping sonar setup, and since they already had that protrusion, they just put it inside of the bulbous bow.

@pizzlerot2730

8 ай бұрын

Now you can tell your dad that it's actually the opposite, and he can learn something new 👍

“Is that a bulbous bow on your hull or are you happy to see me?”

@aberamagold7509

3 жыл бұрын

Sorry I was just waving.

@dattatreya4448

3 жыл бұрын

?

@mrsauce9307

3 жыл бұрын

Lmfaoo

@robertpradella6550

3 жыл бұрын

Lol

@jduff59

3 жыл бұрын

I just like the word "BULBOUS".

I was part of the commissioning crew of the USS Ronald Reagan CVN 76. We had tee shirts made that read, “ I’m Not Fat. It’s My Bulbous Bow.”

@bollockjohnson3706

3 жыл бұрын

*I* too was on the commissioning crew of the USS Ronald Reagan CVN 76 and I am calling you out on your bovine excrement.

@TheGnarlyPigeon

3 жыл бұрын

@@bollockjohnson3706 lol

@jtseafarer6871

2 жыл бұрын

I was also one of the dry dock crew of Ms Rotterdam I have pictures of bulbuos bow but on that time I don't what is the used of that bulb

@i_know_youre_right_but

Жыл бұрын

Shite yank banter

Canceling the wave out, also reduces turbulence and cavitation on the rear propulsion

@bendover2684

3 жыл бұрын

Thanks i Just wanted a short 0answer and Not 4 Minutes of blabla

@isonbogosian3080

3 жыл бұрын

Yoooooooo

@davidjames1068

3 жыл бұрын

Really? For a typical freighter i would have thought that any effect would be dissipated long before it reached the stern of the ship. And no freighter should ever be using it's propellers close to cavitation speed.

@mmonroe8253

3 жыл бұрын

There you go! It took you 10 seconds to explain what the video tried to do in 4+ minutes Thank you!

@bobthebuilder2922

3 жыл бұрын

Yes

i really like these kind of videos, no bullshitting around, informative and in only 4 minutes i know what i wanted to know when i clicked on the video

@roonbare2769

3 жыл бұрын

And no annoying background music

@airzulu2733

2 жыл бұрын

I found it interesting . Having watched ships and this bulbous bow and not understanding what's its use . And now we know . I liken it to a form of leading edge on an aircraft wing .

I'm going to use the information in this video at parties. As an icebreaker.

@felixiathegoat3259

3 жыл бұрын

Made me laugh out loud

@cindyzins6628

3 жыл бұрын

Me too! (LOL, I mean)

@weppwebb2885

3 жыл бұрын

Ironically icebreakers do not use bulbous bows as far as I know. Might want to try a spoonshaped bow for maximum effects. xD

@johnpatz8395

3 жыл бұрын

That’s freaking horrible! I LOVE IT!

@abhi2349

3 жыл бұрын

Lol.. I was already thinking about it !!😂😂

There is actually one more very important reason for the bulbous bow along with the wave canceling effect! A ship which moves considerably slow without the bulbous bow will create 70% more air bubbles than one with a bulbous bow, as well as the lack of wave counteracting effect, moreover the bubbles created by traditional bow gets push to the bottom of the hull which causes a loss of water pressure underneath the hull inturns less force pushing against hull, and decrease buoyancy, therefore the ship will sit lower in the water and create more drag and less hullage capability. on the other hand ships with bulbous bow, when the bow pushes against the water, it creates fewer air bubbles and the bubbles are mostly displaced to the side of hull, therefore, the hull will maintain its water displacement, less drag and what's even better is the air bubbles get push to the side of the hull making it less drag from the side of the hull resulting better fuel economy!

@aberamagold7509

3 жыл бұрын

Did you just make that up? 😃 JK it was a very informative comment.

@chsemaphor

3 жыл бұрын

Lol

@sammynicholas

3 жыл бұрын

@@aberamagold7509In fact I tried it out on a few scaled models and in CAD fluid test and both supports this...

@robbiejosh6082

2 жыл бұрын

I don’t believe you

@BobSmith-cb5xr

Жыл бұрын

Sounds some some brilliant mark Twain shit I like to make up. Sounds good, but is it really true?

I love how the internet have all the answers to those random questions we ask ourselves about lol

@moritzwegge6835

5 жыл бұрын

Yeah!

@doughesson

5 жыл бұрын

Look up cow aerodynamics some time. You won't regret it.

@mackweisz4161

4 жыл бұрын

And all the questions we don’t ask ourselves

@lukeaabbcc313

4 жыл бұрын

@@doughesson down the rabbit hole i go lol

I am teacher and I can tell you you did a great job, no flashy words but the physics was very clear.Thanks

@CasualNavigation

5 жыл бұрын

Thanks Physics_rabbi. I hoped it would would come across clear.

@wholeNwon

5 жыл бұрын

Don't eschew "flashy words". Learn instead.

@RideBikes_Walkplaces

5 жыл бұрын

Not an English teacher I presume.

@wholeNwon

5 жыл бұрын

@@CasualNavigation Clearly?

@chikennuget3634

5 жыл бұрын

wholeNwon when teaching a new concept it’s generally not a good idea to introduce new terms. it’s better to let the students grasp the concept before telling them how to put the concept into words

Never searched for anything revolving ships. But I still clicked

@MeteoricStoneofShatteredSouls

3 жыл бұрын

That's because Google knows what you want to see before you do.

1:37 "If we think back to mathematics." Me: * Vietnam-style flashbacks begin *

@tophan5146

2 жыл бұрын

😂

0:42 ''Let's consider this vessel'' Me: TITANIC!

@notesl5576

6 жыл бұрын

CRS Ikr it's clearly her..

@z0901

5 жыл бұрын

It's so easy to see

@dylanhultman3922

5 жыл бұрын

CRS It could of easily been the Olympic. The Olympic classes all look the same.

@usmc5977

5 жыл бұрын

Me too hahahhh

@prnothall9302

5 жыл бұрын

Dylan Hultman correctly, could HAVE been, or could’ve been. Could “Of “ been, is non- sensical. Just sayin’.

I consider anyone with a British accent to be an expert.

@CasualNavigation

5 жыл бұрын

Thanks Manoj. As long as we all keep learning, that's the main thing

@nearestyoutube

5 жыл бұрын

Mr Bean?

@mog882

5 жыл бұрын

Manoj Philip They feel that way as well.

@MrMunchbunch83

5 жыл бұрын

I'm British with a British accent and I'm an expert in fuck all!!!

@bigbrother9531

5 жыл бұрын

Not me. All I gotta say is, name a ship disaster, then ask, who built her.

Now I understand what the hull is going on! Thank you!

@kindnessmattersmost

Ай бұрын

Clever😂

A lot of this I already knew because I was a US Navy sailor but I’m still learning a lot from these videos, I’m glad I bumped into this channel. Well done.

That’s actually pretty genius. “Hey let’s make a second set of waves ahead of the first that will cancel each other out”

@DrWhom

4 жыл бұрын

Is the effectiveness a function of speed?

@fieldmarshal7298

4 жыл бұрын

@@DrWhom yes

@RyanMcIntyre

3 жыл бұрын

Same principle behind noise cancelation

@hyonker2134

3 жыл бұрын

I used the wave to destroy the wave

@DrDeuteron

3 жыл бұрын

bow's passive cancelation. Not to be confused with Bose active cancelation. also it only has to cancel the wave along the hull, I mean somewhere out there, there might be a bigger wake.

I woke up with a bulbous bow this morning.

@fellowcomrade7357

3 жыл бұрын

Nice

@peterrabbit2965

3 жыл бұрын

Nailed it

@woofowl2408

3 жыл бұрын

I hope you weren't put in a dry dock.

@manxman8008

3 жыл бұрын

what was her name?

@fangospucklovesveena464

3 жыл бұрын

@@woofowl2408 wonder what that ol' Night Mate wuz doin'???

Great explanation! I used to provide water taxi service to ship's agents servicing the cruise ship industry here in Maine. Twenty-five years ago these cruise ships generated huge waves in their wake. Today a 1,000' cruise ship produces a wake smaller than that produced by a 36' lobster boat largely due to these bulbs. And speaking of lobster boats, a local fisherman took a clue from the cruise ship industry and added a fiberglass bulb to the bow of his 45' boat. I've photographed it several times while the boat was tied up to the dock but have never had the chance to ask the owner if it has worked to reduce fuel consumption.

You know I've always wondered about the bump on the bow of a ship but never seemed to research it honestly. Stumbled across this video and honestly learned about it ha! Simplistic explanation and well laid out video makes it super easy to watch. Well done sir

@CasualNavigation

5 жыл бұрын

Thanks killerta87

When I was younger, my dad told me it was for ramming sharks

@iaffrayliillii704

5 жыл бұрын

Lmao that made me laugh

@hiddenname8953

5 жыл бұрын

Happy younger life...

@d3m3n70r

5 жыл бұрын

Right. But it renders useless, when they already began to form a sharknado.

@certaindiaster59

5 жыл бұрын

d3m3n70r lmao! Not the f-in sharknado!

@certaindiaster59

5 жыл бұрын

It started off with only female sharks but eventually it changed to anything in the water and nothing was safe from then on...

“This first vessel” is clearly the Titantic

@irongoatrocky2343

3 жыл бұрын

Full Speed Ahead!

@patagualianmostly7437

3 жыл бұрын

Or...perhaps...one of her sister ships...which gave decades of service. Mmm?

@angelvillegas9604

3 жыл бұрын

@@patagualianmostly7437 Titanic

@ICUinthedark

3 жыл бұрын

@@angelvillegas9604 nope not Titanic, there is no Jack and Kate on the top deck on the front...

@angelvillegas9604

3 жыл бұрын

@@ICUinthedark Jack's not real

0:11 is a Swedish/Estionian company and it cruises from Stockholm to Tallin.

@pihlajafox

Жыл бұрын

Also Finland-Eesti and Finland-Sweden

Excellent explanation. Thank you.

@CasualNavigation

6 жыл бұрын

Thanks William! Glad you liked it.

Nonsense. It was designed by Airfix so you have somewhere to hold the model when you paint it, as any fule kno.

@honeydew5022

5 жыл бұрын

Haha

@NPCSN

5 жыл бұрын

🤣😂

@beepthemeep12

4 жыл бұрын

Lmao

@gormauslander

3 жыл бұрын

And then the shipbuilders were like "oh heck, our ship isn't accurate to the model" and changed it

@kartikkalia01

3 жыл бұрын

Thanks

I've seen those many times and always wondered what they were for. I've heard anywhere from a forward weight to help hold the bow down, to breaking the waves before the bow has to hit them, but this is the first time I've heard about the destructive interference design, how cool!

I would have guessed for two reason : 1. It's act like a bumper, to prevent the hull got damaged if it hit something 2. As sacrificial part, so it get eroded faster by the water, than the original bow section Thanks that I found this video 😅

@seven7zip

2 жыл бұрын

i always thought it was for ramming in military applications

To differentiate male ships from females..

@thickschmeat7560

5 жыл бұрын

there are only female ships cause if a male ship gets penetrated. Its gay

@ianwinfield929

5 жыл бұрын

There’s only two genders

@MrEazyE357

5 жыл бұрын

All ships are female.

@janchocruz1378

5 жыл бұрын

@@MrEazyE357 why?

@SuperKiko112

5 жыл бұрын

And gay ships ? How to differentiate them ?

The bulbs were from WW2 submarines for their sonars, it just worked out for great unexpected advantages other than for sonars. Then so, the bulb design went to ship bows....thanks to the WW2 submarine.

@Shloomy_Shloms

5 жыл бұрын

wave haven A lot of ships in at least the US Navy still use the bulbous bow to house their sonar

@CasualNavigation

5 жыл бұрын

A lot of merchant ships do to. It is a nice empty space right in the bow so is ideal for sonar

@DerSchwantz

5 жыл бұрын

@@CasualNavigation are you crazy or do you not even know merchant vessels have no sonar. The bulb is a void with nothing in it. In some vessels it is common to the forepeak..commercial ships have a transducer for the depth sounder. It's a little bigger than a hockey puck and sits up forward.

@NPCSN

5 жыл бұрын

I was actually wondering this exact thing (about subs and sonar) I was wondering if it was an accidental discovery. 😁 good stuff. :)

@mayuri4184

5 жыл бұрын

The Yamato had it too IIRC.

KZread: Hey you, we see you like to watch sitcom clips and funny animal videos. Now listen to this British guy explain the mechanics of cruise ships. Me: *ok*

@camkai1998

3 жыл бұрын

I’m here a year after 😂😂

@andrewryan4417

3 жыл бұрын

You too?

I went on exchange about 10 years ago... Lived a while in Finland... Traveled in Silja Line and Tallink, to Tallin and Stockholm... And also visited the Vasa Museum... I loved ships but never imagined I would end up studying naval Architecture as now ❤️

All this time I thought it was for crushing ice. I learnt something new today. Thank you

@DeathByLego

3 жыл бұрын

There are some for crushing Ice! The have bigger, angled fronts to push the ships above the ice, then the weight breaks the ice!

@thatdude101ish

3 жыл бұрын

@@DeathByLego dam! that was what i was going to say, ice breakers are very costly to run due to the flat hulls and the drag.

@DeathByLego

3 жыл бұрын

@@thatdude101ish have you seen the biggest Russian one?! It’s an absolute monster.

Its there for the purpose of reducing drag and streamlining hydrodynamics. Plus it can alsi be used to RAM the hell those megalodon blocking the way

Subscribed to your channel recently. Really interesting to learn new things about an area that I’ve not really thought about at all before. Thanks

This is great thank you. I love learning about anything! I used to go out with a girl whose father was a naval architect. He made millions because he created a piece of software that predicted the rise in water levels. He wrote it in C+ years ago. He was actually an arse outside of that. When I started seeing her he Contacted my university to see if I really worked their and completed a PhD there. As I was really well known, and this is a very specialist small university, which only has PhDs or Masters, HR contacted me, laughing about it. He pretended that his company was offering me a job, so he broke every privacy rule around. He thought he was the only person in the world with a PhD from a world top ranked university.

@anthonyboyce8844

3 жыл бұрын

You got a PhD?is English not your first language?

I've just assumed forever that it was to add buoyancy to an area of the hull with the least. A great explanation.

@jalaluddinmorris2978

3 жыл бұрын

... and by adding buoyancy it helps a ship do what it is meant to do - namely carry things.

This is called "destructive interference"

@Allthingstech3108

5 жыл бұрын

jon doe The phenomenon is called destructive interference it is an important phenomenon in the physics of waves.It is taught at 1 year college and senior classes in schools

@baduploadschedule1015

5 жыл бұрын

jon doe Thats what it's called itself, but the effect it has is callef destructive interference

@Allthingstech3108

5 жыл бұрын

jon doe correction "gone to" instead of went to

@lelandlewis7207

5 жыл бұрын

Sounds like Tump's foreign policies. 😀

Brilliant. Short, neat , clear and interesting. Thank you.

Cool and to the point video! I knew the bulbous bow helped ships sail more smoothly but until now didn't know the principle behind it. 🚢

Wonderful explanation, in 4mins I feel like a smarter man!

@CasualNavigation

5 жыл бұрын

Thanks Scott. Glad you liked it.

@patagualianmostly7437

3 жыл бұрын

Is that not the whole reason for You Tube existing? Just a shame more don't use it.... after watching those of Jay Leno. Dear-oh-Dear. The billions wasted on education. It could actually fund a social health care programme........

Reduce wave friction on a ship of a certain size and speed + convenient location for the sonar suite. There are a couple more advantages and disadvantages but that is the tldr. Keep up the interesting topics. Will watch the video to see if i am right :)

Things that we spend whole day in studying, learnt in 4 minutes. Thanks!

When I was young, I thought it was a sonar dome. Then I realized its true purpose. The first ship to have the bulbous bow was the S.S. Jimmy Durante.

@stevelivers3793

2 жыл бұрын

Lol

@ember9361

Жыл бұрын

Hm like a beluga whale :)

I was told that they were small rooms for radar sensors or something, I don't remember where I learnt that but this makes a whole lot more sense, you explained it very clearly.

@zo5679

11 ай бұрын

It true for the Arleigh Burke Class Destroyer and other military ship

It’s used for making baby tug boats that will someday grow up to be ships.

@alfredmorency8296

3 жыл бұрын

Tugs never get anywhere, they just hang-around their mother's harbor. you have to cleave some water to be a ship.

@rosethefirechieftess1683

2 жыл бұрын

🤣

I really appreciate how you get right to the point from the start.

Outstanding explanation. I had to watch it again to refresh my memory. Well done!

It sounds a bit weird to call it drag because we usually call it resistance. But i think it's to make the explanation understandable to those who didn't know Naval Architect. Great job!

@markgadsby5568

Жыл бұрын

Resistance is normally a force directly opposing something whereas drag is friction along the sides

I love when KZread answers all my questions at 2am.

It also helps dampen pitching, albeit slightly. The sonar dome of T22 batch III frigates, which is a larger version of a bulbous bow, reduced slamming noticeably.

Just popped up in my suggestions thumbs up though!! You piqued my interest and now I know some thing I never knew that will probably serve me no purpose but I'll pull out one day like yah know what that thing does and explain

We can add one more function to the bulbous bow: to get stuck inside sand and prevent ship from moving

I had no idea I needed to know this but I’m glad I now do!!

Perfect video. Short, sweet, to the point with no waffle or bullshit. Thank you

Wanted to shout out the way you remind users to like videos without directly stating it, I and im sure many others appreciate your indirect approach

I am always thinking that it serves as a water break. Thank you for educating me

I live in the middle of the desert, why am I watching this at 1am...

@nxtchpforme9154

3 жыл бұрын

Happy life??

Nice video. Clear and concise. Something I always wondered about. Thanks for posting.

US aircraft carriers are designed with that bow piece for the same reason, even though being nuclear powered pretty much negates the need to conserve fuel for the vessel's propulsion.

@danepatterson8107

5 жыл бұрын

Of I am not mistaken, it was the Japanese Imperial Navy that invented this for the Yamato and other fast huge battleships.

@vk2ig

4 жыл бұрын

@@danepatterson8107 You are mistaken. While bulbous bow designs were developed for IJN ships; according to en.wikipedia.org/wiki/Bulbous_bow, _the bulbous bow concept is credited to David W. Taylor, a naval architect who served as Chief Constructor of the USN during WW1, and who used the concept (known as a bulbous forefoot) in his design of the USS Delaware, which entered service in 1910._

*I have wondered this for years. I suspected it had to do with waves but how exactly I didn't know. Thanks for making this video.*

Nice job demonstrating this on an Olympic Class Liner from the White Star Line! If they only had this technology and knowledge over a hundred years ago that they do now (that and also safety equipment)?

@CasualNavigation

5 жыл бұрын

Thanks Zach. Glad you liked it!

@dylanhultman3922

5 жыл бұрын

Zach LaFleur My first thought was “Is this the titanic?”

@ph89787

5 жыл бұрын

In which case. If Thomas Andrews can get the length of the bulb correct. Not only would Olympic, Titanic and Britannic be even more fuel efficient. The reduction of drag could raise their top speed by a few knots. Whether it would be as fast as the Lusitania and Mauritania, i don't know. But it would be close. Hell it would be even a great selling point for passengers.

@rimmipeepsicles1870

5 жыл бұрын

@@ph89787 'cause what would passengers care about? Mostly luxury and speed. They would even retain the Blue Riband if they had bulbous bows for how many years, probably up to the inter-war period.

@vk2ig

4 жыл бұрын

The increase in speed due to the reduced drag would only mean the RMS Titanic would've hit the iceberg at a higher speed and possibly done more damage so it might've sunk faster.

This video fulfills my daily quota for new things I learn. Thanks.

Your videos are always compelling. Thanks.

SILJA LINE!!!!🇫🇮🇫🇮🇫🇮🇫🇮 Suomi

@veewee4826

4 жыл бұрын

PERKELE TORILLE SAATANA SILJA GALAXY

@kaiusylander1320

4 жыл бұрын

SUOMI PERKELE

@seal7216

4 жыл бұрын

Silja line o paras👍👍

@AngelVazquez-xh1dh

3 жыл бұрын

I navigated in one of those ❤️

@flintytheraccbold

3 жыл бұрын

Have you Finnished

I learned something new today! The more you know 💫

This is the first time i came across such an easy explanation. Thank you so much...

I've been wondering what the purpose of those things were and now I know. So thank you for clearing up one of life's great mysteries for me.

Thanks! I learn so much from your videos! Keep it up!

I have no idea how I ended up watching this video but that’s something new I’ve learned today thank you! 👌🏻 +1

I worked building Navy ships in Bath, Maine. Military ships often have their sonar in these forward bulbous bows to locate them far away from the ships internal noise.

I always assumed it was to protect the ship from a front impact. But I never had a real answer and didn't even know what they where called. This makes alot more sence. Thank you!

Yes always wondered what they were all about Thankyou

@CasualNavigation

5 жыл бұрын

Thanks Craig. Glad to help out.

Very interesting. I knew it helped fuel consumption, but never knew why. For some reason, we always called it a "steering bulb", which is totally inaccurate.

@CasualNavigation

6 жыл бұрын

Thanks Capt Edward. I guess it could help with steering by increasing the length of the waterline, thus affecting the length / beam ratio. I hadn't considered that before

@MotoroidARFC

4 жыл бұрын

Some ships have thrusters inside them that help turn the ship when docking.

Hi CN. I'm really loving your videos so far. Keep up the good work!

Excellent video and very informative. Would you be able to do a video explaining the parabolic bow and how it works please? I have become fascinated with the new Virgin Voyages' Scarlet Lady and it has a parabolic bow. I have noticed that some new cruise liners are now using this type of structure as well and I am wondering how and why they are doing so and have yet to find anything that really explains it as well as you do. Thanks so much for these well produced nuggets of information!

You make it easy to understand..that is a very difficult thing to do...thanks

@CasualNavigation

5 жыл бұрын

Thanks When I became the sun. Glad it was understandable.

Well done CN. First time I have seen a video applcation of the sine wave concept to explain the function of a bulbous bow. Is this now a part of the STCW based COC syllabus for mariners? If not, it should be. Downside of bublous bows? They make huge and expensive holes in the hulls of the ships they crash into!

@CasualNavigation

5 жыл бұрын

Thanks Seaprof! I do not believe it is part of the STCW syllabus - I only know it because I had a background in physics before going to sea so I find these sort of things fascinating. You are right about the holes too. Bulbs are below the water so unfortunately tend to do damage below the waterline!

@DerSchwantz

5 жыл бұрын

The physics are better understood when you apply rudimentary hydrodynamics. In the beginning g of the video the narrator does not develop this by treating it as a waveform analysis. Any naval architect William explain that the high pressure of the bow wave is minimized as it passes the forebody of a displacement hull such as that show in the video. These initial dips or trenches of the bow wave contain suction proportional to the bow wave, and that is drag. The bulb minimizes this. Which is why they are less efficient as speed decreases. The latest designs for slow speed have a token bulb or none at all.

I've lived this long not knowing what the bulbous bow was for, nor did I know why ships are painted red below the water line, and I've learned both in one night. Pure KZread genius! Outstanding video, and not even one comment mentioning Ron Jeremy from the Peanut Gallery.!

Thanks for a concise informative video! First time in my 67 years I've now learnt this. As a former engineer, I like to translate things in to my way of thinking: "Bulbous Bow generates an antiphase waveform (great pun opportunity!) that cacels the normal bow wave".

Strange this should pop up now, but I think it's for getting stuck in canals.

@chrisest6715

3 жыл бұрын

🤣🤣🤣

I thought that they were designed to reduce water resistance at the front of the ship, like airliners have a round leading edge at the wings. VNow I see it with a totally different view than before, thanks to your excellent explanation!

@CasualNavigation

5 жыл бұрын

Thanks Bandicoot

@DerSchwantz

5 жыл бұрын

...and Bandicoot has it right. An aircraft wing operates on the same principle by splitting the air into the longer upper path and the shorter lower path it creates low pressure drag called the Bernoulli Principle which generates lift.

@vk2ig

4 жыл бұрын

@@patrickbennett752 LOL. If it's not Bernoulli's Principle, then what is the principle dictating how an aircraft wing generates lift?

wish I wouldve found this channel sooner, very informative. Great Job.

Love your videos! short and to the point !great content

Keep up....your channel is great!

@CasualNavigation

6 жыл бұрын

Thanks reifukaiyukikaze!

I've Actually seen Tallink or Silja Galaxy in real life when I visited Latvia, Beautiful ship.

@Janfey

4 жыл бұрын

I've been on it many times.

Coming from a family of sailors for over 5 generations, I’m no expert, but I do know this.., The configurations belong the water line are the most critical when dealing with speed, handling and fuel/wind economy. It’s all about the math, not looks. Fabulous video.

I finally see a practical application of the sine and cosine waves taught in school years ago.

I almost bailed out at “...lets think back to mathematics...” but pleased I stuck it out! 😀 Excellent explanation and it seems you have attracted quite a number of intelligent and observant comments as well. 👍👍👍

That’s very interesting. I always assumed the bulbous bow was to deaden a head on grounding of the ship. I figured the sharp sleek hull of say the titanic would cut through the water without any problems.

@CasualNavigation

5 жыл бұрын

Thanks Grimreaper57. Glad it was interesting.

Some trawlers I worked on had bulbous bows , secondary purpose was as an extra fuel tank to increase time on the fishing grounds .

Thanks for the explanation. Always wondeeed about this, but I've never found an explanation before.

“As you can see, they’re all different sizes” that’s what she said.

@JorgeGonzalez-ut3pm

3 жыл бұрын

Lol

@jduff59

3 жыл бұрын

At least it's not called a "bulbous member".

@boataxe4605

3 жыл бұрын

I was about to give you a like, but I saw that you have 69 so I’ll leave it alone.

Thanks. Keep up the good work.

@CasualNavigation

5 жыл бұрын

Thanks Asura

Great, understandable, to the point explanation. Thank you

I love your videos, finally something to learn on the internet

I guess what it was for after watching the clip at the start, feeling very smart right now

It's really only effective at design draft and design speed chosen by the naval architect.

Thank you for your effort to explain us , I was wondering what it does ,now I know 👍

Would it make sense to design a variable bulb that could change size depending on speed or sea condition in order to optimize efficiency?