I'm glad you've revered the extinguisher

So just some helpful advice for your version 2.0. Since this is a Lockwood-Hiller Design, your exhaust tube should roughly be 1.5-2 times the diameter of the intake tube. Also, the exhaust tube and your combustion chamber should have roughly the same volume. You want to keep around an (8.7:1) ratio of the diameter to the length of the exhaust pipe. If too long then the exhaust gases will "burn out" and cool down too much -- making it impossible for them to ignite the fresh air/fuel mixture. Try and keep the exhaust and intake ends almost the same length with the exhaust slightly longer to avoid sucking in the exhaust. Also from a safety standpoint take the fuel line off of the exhaust tube as when the engine starts and gets to temp it will make the propane self-ignite within the tube. I commend you on actually getting up and building something. Trial and error is a very good professor for hobbyists and professionals alike. Always be learning and be able to accept positive criticism in order to improve your projects and yourself. Good luck in your future endeavors young man. I look forward to the next version.

@mrpingen

Жыл бұрын

Thank you!

@Fr4nzSK8

Жыл бұрын

When you say exhaust tube, does that mean all the piping from the combustion chamber and out, or does it mean just the exhaust cone itself? :-) I am calculating the volume of the combustion chamber and exhaust, as you mentioned that they should have the same volume. Thanks

@mrpingen

Жыл бұрын

I was looking at some slight modifications and your question about the exhaust occurred to me as well. 🙂

@Fr4nzSK8

Жыл бұрын

@@mrpingen I am building a jet myself and have a slight bigger combustion chamber than on the drawing som i am wondering about this. Great video btw! cool to see a smaller version also! cheers from Norway

@mrpingen

Жыл бұрын

@@Fr4nzSK8 Are you going to make a video of your jet?

I love that you made it work with a stick welder. You give your fellow budget pulse jet enthusiast hope

@mrpingen

Жыл бұрын

It is amazing what can be welded with a stick welder - it is just not very neat though. I have TIG gear but it goes through gas like it is going out of fashion - it does make a nice job as long as everything is very clean.

Excellent 👍 Definite sub from me. On to part 2..... All the best, Paul PS. Not too bad a welding job considering it was stick welds on thin walled tubing 👍

Greetings, from New Hampshire! Great job on the pulse jet first build! I've built several ranging in size,most run from a 20 gallon propane tank,and wow they just chew through the fuel!,I've switched over to gasoline with a fuel injection pump,Saab,but most pumps over 70 psi will work. A nozzle from a furnace to get it going easily,then to a copper.030 mig welder tip,spraying against 1/2 steel disc suspended mid compression chamber an inch from the tip,still eats the fuel,but it's cheaper! I Isubcribed today!

@mrpingen

Жыл бұрын

Your comment is not only useful but also timely as I was just yesterday working on the pulse jet setting up a proper butane/propane idle circuit and spark ignition. I am now looking at using methanol for the main fuel but have yet to figure out the system for it. I was considering homemade acetylene but it might be a bit too dangerous. I left it running in the garage and went out the front of my house just to hear how loud it is - it is louder than I thought and that was just on butane/propane mix, only the Gods know what it must have been like on 'MAP Plus' gas. You look to be a bit more rural than me - I have close neighbours (neighbors) to consider and most of them are pretty quiet. There is one scummy lot nearby and the next time they have a loud party.....

@pierrelaboom4026

Жыл бұрын

@@mrpingen yes,the noise can be startling for the unfamiliar, in fact,I am required to call police dispatch and tell them each time I build one and fire it up,I can't imagine what they tell the people that complain,Still, I'd call it a win for me!

That is just awesome.. put some cooling coils around the hot spots and use the intake vacumn to draw the heated air in..

@mrpingen

Жыл бұрын

Interesting thought, perhaps heat the fuel though?

@randallmarsh446

Жыл бұрын

@@mrpingen defitnitly would .. another thought was to put a wire honeycomb mess in the burn chamber to get a more even burn and keep from flaming out ,Theres alot of different implication going on here and the apllications are beyond the imagination.ty for showing that i got some ideas that will piss the power companies off.

Brilliant Pal !!

@mrpingen

Жыл бұрын

Thanks and glad you liked it. It might take me a bit of time to get the liquid fuel system sorted but that should give my hair and beard time to recover from the singeings they have received!

Been thinking about waste oil in one of these but I haven't even attempted to build one. Big credit to you for getting it right so easily. You could use LPG from BBQ gas bottles to get the jet hot which will phase change the oil from a Liquid to a vapor and it may tun then. Fuel delivery will be the crucial factor. I'd suggest something like a Roller type Fuel pump ( Bosch 044 Type) and them something like a carb jet or a needle valve to control the fuel flow. I would think warming the jet up hot and running at Minimum throttle and then adding the oil to run it hard and turn off the gas. I don't think pre heating the oil as everyone suggests with these things would help. Just have it going to a red hot part of the chamber and it will vaporize. Be very interesting to see how this goes as I can think of a bunch of things happening but what matter and what determines if the engine will run or not is a different thing. You sure would have an interesting engine though that could be used for heat and maybe power and if you could run it on waste oil, you could run the thing long as you liked.... or could stand it.

@mrpingen

Жыл бұрын

Just the sort of stuff I have been thinking about so your comment is a timely reminder for me to get on with things, so thanks for that. Colin Furze and Robert Maddox both run them on Diesel - Colin idles on gas and throttles up on Diesel; Robert starts on gas then switches over to injected Diesel with no gas. Not sure how Colin does it though, it doesn't look like fuel injection from what I can see. It drains one of the 400g MAPP gas cylinders in two minutes hard running and then just flares out due to lack of fuel. It certainly does make a good heater but at £4 a minute on the little cylinders is mega expensive. I am looking at getting a large propane cylinder to use with it but there is great difficulty getting cylinders at the moment for some reason unless you have one to exchange, which I don't. I have kind of amazed myself with how well the jet works to be honest - thought it might end up abandoned in a corner somewhere as an unfinished project. Big thank you to everyone who is watching, subscribing and taking the time to comment. Cheers.

@glumpy10

Жыл бұрын

@@mrpingen I am very interested to see how you go with this and if there is anything I can help you with feel free to ask. never done a pulse jet although have wanted to but I have a few clues about oil Burning now. There are a couple of things with oil that's different with Diesel. Firstly, Diesel is a lot lighter in the fractions so Combusts a LOT more readily. That said, If you put oil, engine or Veg, into / onto a red hot surface, it will phase change ( boil) instantly and turn to a gas. My question with this is how will the jet handle it in relation to the lag time for that to take effect? there may be -some- puddling of the fuel and that will relate to how well the jet will handle a rich Mixture in effect. I think it will be OK because it will burn according to the oxygen available and then re-ignite when there is a fresh air intake. I have had to watch this with hot burners over the years flaming out because if they are smoking which is just gas and you reignite in an enclosed Cylinder, then they can go pop.... which is exactly what you want. :0) The other thing is waste oils leave residue which refined fuels ( Diesel, Turps, petrol etc) do not. My Burners don't have a problem with that because they burn hot and have excess air so the resulting carbon is burned to fine ash which is exhausted. I think your Jet will do the exact same thing. the vibration alone should break up any residue and eject it. I think you will see a good amount of sparks as that happens but nothing to worry about. I believe this will work, I think you may find it better to move the fuel to the back of the combustion chamber so it is further from the short end which would be fine as you can inject the start up gas where it is now. This will give the oil more time and surface to evaporate on and stop spitting raw or burning oil out the end. You will also I think want the smoothest Fuel delivery, Maybe a pressurised tank instead of a pump would be better and then you can have a small orifice and control the oil flow just by regulating the fuel pressure. Going on the fuel burn you are having, My guess is you are going to want about 150-300Ml of Oil per minute fuel flow. That's kicking out some heat, ( about 150 KW ) and can think of a lot of different factors affecting that but that is where I would start. If you set up your fuel flow around that before you start, I think you would be in the ball park and could tune from there. I think the difficulty will be in just finding the sweet spot but one you do should be very consistant and easy to fire up. A lot of people get scared when they get a flare up with oil and shut things down just as they get to where it's going to go but if you expect, ignore and work though that You shouldn't have much difficulty. The trick with oil is HEAT. Not atmosiation or whatever, you need heat to change it from a liquid that will not burn to a gas that will and that is all you need to remember. Look forward to your future experiments!!

@mrpingen

Жыл бұрын

Thanks for that - it has got me thinking about a few things and confirmed some of my own ideas. Finlay Shellard (in NZ) tried some experimenting with different liquid fuels and found old engine oil to be the best of what he tried, which is interesting. I remove ethanol from our rubbish petrol for use in my old two-stroke bike (ethanol would damage the crank seals) so I was thinking about distilling that off from the extraction water and using it. Ethanol would burn very clean but would need a lot of flow due to the lowish energy density. I have seen some people cobble together "pulse jets" from old tin cans etc. and just pour some liquid fuel in and set it going. Seems to work so I guess any pooling, as you suggest, wouldn't cause problems. I also wondered about adding something like a piece of perforated tubing inside the combustion chamber which would heat up and give a hot surface for the oil - might, of course, cause problems for the running of the jet. Anyway, thanks again for the info. and ideas.

@gigabytegb

Жыл бұрын

@@mrpingen Didn't you try to mix propane or butane with the oil? Maybe it will turn the heavy oil (engine lubrication used oil; burned oil) more volatile and easier to evaporate and atomizer. I already mixed LPG (mixture of propane and butane, the cooking gas here in Brazil) with gasoline, ethanol, and diesel. Sometimes I like to put propane/butane into a Coca Cola bottle 😶 at about 6 bar of pressure. When you make the mixture with others hydrocarbons the temperature will increase a little, them you need to insert it slowly. Increasing the proportion of heavy hydrocarbons in the propane, the static pressure will decrease and you can maintain for a longer time inside a Coca Cola bottle in your bedroom 😶. But, but, you can operate a red cylinder as an inverse fire extinguisher 😂. A fire extinguisher is a very good cylinder for storage pressurized gas up to about 15 bar of pressure. The R134a too. I like to storage LPG in an cilynder of R134a or R22 because is cheaper, lower weight and easier to transport.

@gigabytegb

Жыл бұрын

@@mrpingen Here in Brazil the gasoline have 27% of ethanol 😶, the biggest proportion in the world!

With a stick welder? Respect!

@mrpingen

Жыл бұрын

Not as neat as TIG (I have TIG gear but the gas is very expensive and it uses a lot). Can't weld continuously though so have to keep stopping and let it cool for a second or two. I am so busy with other things that I seem to be making very little progress with the liquid fuel system. Pretty certain it will be methanol though - should be a nice clean burn.

@heliarche

Жыл бұрын

@@mrpingen If you can get the job done with your stick welder, seems like you're better off. Sort of like training under adverse conditions. I have a MIG and I like it but same here, the gas is expensive. That engine sounded vicious with the MAP gas!

@mrpingen

Жыл бұрын

@@heliarche I was starting to mess about with acetylene production with the intention of using it as the idle fuel then using heavy oil of some sort. But, as you will know I am sure, acetylene is megga dodgy stuff. Even though I have welding/safety/hazardous area training I might not continue down that road. It could also melt the jet - now that would make a good video!

Cool jet. Well done! Have you considered Iron Bru for a combustion source? 🙂

@mrpingen

Жыл бұрын

Why?

Nice build! And a good explain Do you got Some building plans for me?

@mrpingen

Жыл бұрын

Thanks! If you go to 3:40 in the video you will see the plan. Diameters are on the inside of the drawing and lengths/widths on the outside, all in millimeters. For example, the large exhaust cone is 478mm long, 58mm internal diameter at one end and 33mm at the other end. I am going to try some modifications and will update with a new video - when I get a chance as things are busy at the moment (aren't they always!). Still trying to sort out a liquid fuel system but I have now got most of the parts collected that I need... 🙂

Hey man that's very interesting I'd help you if you want to continue researching I'm in Cheshire I suppose your either newscastle or Rochdale I think you'll do well I'd bring me tent

Very cool indeed! What is that,an icelandic Finnish on some of your words? Hardly noticable! Good video!

@mrpingen

Жыл бұрын

I am Pictish, French, Spanish. Worked in various parts of the UK often rural areas with strong accents but, interestingly, sometimes with scandinavians. I might have picked up some of their ways of speaking and it is possibly similar to Icelandic so well noticed.

Could you please do a video on building your valve amplifier ? It resembles a Trainwreck amp, which is the style I'm most interested in, so I'm curious what you did with yours. You play guitar, or at least enjoy trying to, right !? We look like we could be brothers across the pond, so I suspect we're off the same age group.

@mrpingen

Жыл бұрын

I have actually started a video on the amp. but, as is often the case, got sidetracked by various things. I will get one done and might even display my less than average guitar playing skills in it. Have a look at my channel later on or in the coming days as I could cobble together an intro. or teaser video. Had a look at the amps. you mention and see what you mean. There is a bit of a backstory to the case I made for mine.

Any idea of how much thrust it produced running off of propane or acetylene?

@mrpingen

Ай бұрын

I have not measured it yet. The jet is kind of on hold as the houses next to me figured out who was creating the infernal noise so I thought it best to leave it for a while. I will get it going again in the winter during some very bad windy weather.

@brandonlaragirl

Ай бұрын

@@mrpingen sweet

Props for butt welding tubing with a buzz box.

Hehe quality!

try rocket nozzle widening valveless continuous burn "pulse" jet, more like afterburner than pulse jet tho

@Jkauppa

Жыл бұрын

yes pass-through air input, valveless afterburner (sc)ramjet, hour glass shaped, able to work both ramjet and pulsejet like modes

@Jkauppa

Жыл бұрын

no moving parts/flaps/valves

@Jkauppa

Жыл бұрын

if you dont use external heat, but gasoline, then use a glow ignition electric resistance coil to vaporize mix burn the fuel, like a fuel b0mb

@Jkauppa

Жыл бұрын

yes a flame thrower

@Jkauppa

Жыл бұрын

more like a well mixed fuel rocket stove, than a pulsejet, without the noise

I love it, make the next one bigger ! Gotta lose that stupid high viz though, they're loose, flammable and usually just a neon sign advertising I've got no idea what I'm doing so when it all goes wrong, please don't run me over as well. And most importantly, H and S will have pity on me when I'm laying in hospital after being shrunk wrapped in dayglo orange synthetic high viz material. Trade the fire extinguisher in on a bigger gas bottle.

@mrpingen

Жыл бұрын

I will need to get a better source of fuel before going bigger. It is obviously the way to go though, like Colin Furze and Robert Maddox.

@funkiwikid6106

Жыл бұрын

@@mrpingen Diesel injection ?

@funkiwikid6106

Жыл бұрын

@@mrpingen Did you have to play with the length or was that a lucky guess? It seems to start easily which is great.

@mrpingen

Жыл бұрын

@funkiwikid6106 Diesel injection - Yes, Robert Maddox does it that way - check out some of his videos.

@mrpingen

Жыл бұрын

length: I had to add in the vertical section on the bend to get it to go. But, in the part 2 video I remove it (plus a bit more) and add on to the exhaust cone length. It seems to work better. You are only seeing the easy starts in the videos.

Thrust?

@mrpingen

Жыл бұрын

Yes. Not measured it though - yet.

@brandonlaragirl

Ай бұрын

We need to know! Awesome video!

All you got to doo now is connect it to old moped and zoom to Middlewich come see me

Volume fades sometimes.

@mrpingen

Жыл бұрын

One of the problems of using the microphone on the phone. The editing software I use allows volume adjustment of the individual sections but it seems to be a bit hit and miss - even when set at the same level they come out different in the finished video to how it plays in editing. It is a bit of a nuisance. Thanks for commenting on it as it lets me know that others notice it.

Wake up neighbors!!!!

Mount it on the back of a bicycle.

U vau 😮😮😮

@mrpingen

Жыл бұрын

🙂

Put it in your truck down right dangerous

Sorry, saw you're very soaked feline and so many single entendres came to mind. British humour. Of course a Scot with a cheeky wee peek can assemble it in jiffy. Scottish- genetic engineers. "I'll just add a wee bit here"- goes like a Buzzbomb. Is there a limit on the fuels you can use? I'd imagine it wouldn't take to heavier oils?

@_soku_

8 ай бұрын

this made me laugh 😹😹 as for the question of fuels, ideally you want a gas as fuel. liquid wont work properly as it will not pulse properly. you need a gas such as, propane (best), butane (another good option), kerosene is good, gasoline, as long as you inject it slowly it will evaporate into a gas, you just dont want to flood the chamber. hope this helped ❤