Stainless is an extremely good insulator, you can hold your hand within 3" of the engine. Add to that the fact that propane expands and acts like a refrigerant, after a minute or two of running the propane tank can actually form ice on the tank. If you sit around and do nothing for the time it takes for the tank to heat up to the point where something bad can happen, you would have to be an idiot. Common sense is keeping something for putting out fires near by, no different from a BBQ grill.

Its about 1000 degrees away from melting, you can hold your hand 6" away from the chamber just fine, the propane tank 4' away is actually chilled considerably by the evaporating propane.

nice lamp

If anybody wants to try this engine, it is important to switch to liquid fuel when the engine reaches operating temperature. If you operate the engine on propane vapor, thrust will decrease rapidly. You can only get 60 percent power with propane vapor. this is because the volume of the combustion chamber is not the same for propane vapor and liquid fuel. Propane vapor will take more space. Therefore, with propane vapor, the volume of the combustion chamber will be small. This information is from the Thermojet patent (US patent 3,517,510. page 4)

@Nick-dz4ml

6 жыл бұрын

Andrew Shingange switch to another fuel lin3

That shot looking down into the chamber was just awesome.

0:42 I expected a mini boom, and got that cute PFT sound :D

I would seriously consider moving the propane tank to the outside of the shed and run a longer hose. Could be a disaster being that close to the glowing part of engine.

"MOVE THE BLOODY PROPANE TANKS!!~" Haha, I was thinking the same thing.

@josephstalin364

3 жыл бұрын

Ikr. It’s terrifyingly close.

Thanks :) Nice to see you on here too :)

Segurança NOTA 10 pra esse cara pqp... This guy think Safety certainly ò.Ó

Pulse jets have been known to run on anything from sawdust, coal dust, to diesel and petrol.

Thanks for your help, and I'll stick with making mini-models for now XD

amazing work friend

That is true. Once it gets hot, the cycle continues on it's own.

Nicely done.

can u send me a blueprint of ur engine plz. i m making a smaller version for a project

Fine Engine Eric: Jim

That looks VERY safe.

I think you are super awsome and smart. I built a u type valveless pulsejet but cant get it to light. So i am going to copy yours. Thank you smart gentlemen.

That's pretty neat.

Cool project, I'm thinking of building one myself....

Pulse jet engines are pretty easy, you ignite the fuel, and a "pulse" is created. The resulting vacuum pulls more fuel into the combustion chamber, and it ignites again. This process repeats and creates a jet engine.

Core temps of the pulsejet are close to the temperature limits of the fuel burning in a higher oxygen environment. Propane will produce a core gas temp of over 2600 F very easily. Propane stoves, or even torches for that matter wont really melt steel, but if you stick a steel bar in the tail pipe of a pulsejet, it will melt very rapidly and shoot globs and sparks of molten metal out of the engine.

Great video! amazing how the combustion chambers lights up!

lol i was waiting for the gas containers RIGHT NEXT to the glowing hot end of the jet to explode or something

Another interesting thing is that mild steel engines will have lower core gas temps than stainless engines. The mild steel conducts and radiates heat away so much more rapidly than stainless. A mild steel engine can give you an infra red "sun burn" up to a foot or two away, where on a cool day you can put your hand right next to a stainless engine for a few seconds without discomfort. The energy that doesnt escape from a stainless engine is kept in the exhaust to do work and create thrust.

Wrap it in some Kaowool/Inswool, ceramic wool that can stand up to 2800-3000 degrees F. Great insulator and will probably enhance efficiency as more energy is directed out of the exhaust and not radiated off as heat. I use it in my propane forge, 2" thick, and the steel shell only gets up to a few hundred degrees despite the inside behind bright yellow orange.

wow that got hot very fast..

wow! future sound of airline!

HEY!!! ITS A LAMP lol but that thing is shining!!

The pressure changes rapidly, but you can measure the pressure with the right equipment, peak pressure is about 60 psi, the min pressure goes down to about 7 below atmospheric.

I would think that the header tape would probably cause the stainless to melt as it would prevent a lot of heat from excaping. Ceramic lining a pulsejet on the other hand would keep the stainless from absorbing a lot of heat in the first place. Doing both could have some very interesting results.

cooooooooooooooooooooool goes into my favorites list

awesome video. you should make a tutorial on how to make one

10 lbs thrust, with a special mix of methanol and gasoline and a model turbine fuel pump One of these has put out around 14 lbs thrust on a RC setup.

@BeckTechnologies 1. Put it in a plane to demo it. (ie fly it) 2.Show how you propose to carry liquid Propane in the plane (and control flow rate) 3. Show the engine on a test rig doing 1lb up to 10lbs thrust. 4..Demonstrate thust to weight ratio.

With how good of an insulator stainless steel is, and how much propane cools when it expands out of vapor form, putting the engine directly against the propane tank would possibly just barely make up for how much the tank is cooled. A few minutes of running will cause the tank to form ice on it, 28lbs of steel + 20 lbs of propane all cooled below freezing would take a lot of heat input to not only keep up with the cooling but cause it to over pressurize.

mild will do, but it will deteriorate after a while. i built a small one with .060 thick mild steel and only ran it 7 times before it burned up. im trying to come up with a design that uses standard plumming parts so more people can make them.

interesting for an R/C setup but how much thrust does it produce and would the extreme heat be a problem?

Its not really an overheating problem, they are designed to run that hot, using stainless to handle the prolonged high temps. You can run them on RC planes, liquid fuel systems with pumps work the best.

Now to figure out a way to stop the combustion chamber from melting

Maybe this works better as an efficient heater :) Anyway, great video!

That Thermojet is a cool engine. Now that I have a better job making better money I can save to buy me a TIG welder and start making these things like to make a scaled down V1 to mount to my bike and go buzzing down the road.

Butane does not burn very quickly but you should still be able to get an engine going on it. You need an ignition source in the combustion chamber for best effect, if it doesnt ignite in the right spot it wont build up to the explosion like combustion.

@BeckTechnologies makes sense. but how big is the power increase compared to methanol or kerosene?

Are there any good videos that explain how these work?

Dimensions are rather important, cant just stick a bunch of tubes together and expect it to do anything other than burn fuel and make noise if it runs at all. With some engines altering the dimensions 1/8" can result in a 50% increase or decrease in thrust.

That's 10lb thrust. A lot of people use propane. It can be as cheap as the cost of scrap metal and some brake lines if you know how to weld. Now sure you could rig it on a bike, gokart or whatever, but I'd be iffy about ridding along with a red hot piece of steel. Plus you can't run them very long without running the risk of failure.

Just out of curiosity, have you ever tried to measure its loudness with a sound level meter?

So if you want to heat something up really fast, and make a lot of noise while you do so, this is the technology for you ;)

Is there a way to measure pressure within the combustion chamber ? I know it's oscilating between positive and negative pressure... but how great is the pos pressure ?

@BeckTechnologies Do you have clip of one of your engines running on Methanol perhaps?

what about running this off of and in conjunction with woodgas

I would enjoy fabricating one of these. My house is heated by a pulse jet furnace. Very interesting.

I was wondering that what's the radius of the chamber's back-panel?

Because when they ran out of fuel (acetylene) there was a flap that deployed to make them dive

The design is mine, roughly based on the Thermojet design, except with huge changes to the intake lengths and configuration for better performance.

@Themayseffect Pulsejets will run on almost anything that burns, but if you deal with them on a daily basis, you'd probably go with propane too, since you dont come home every night stinking of kerosene. Methanol mixed with hydrocarbon fuels produce very good results. Hydrocarbons will burn significantly cleaner with methanol mixed in.

how much thrust is that thing kickin out and how many would i need for a jet pack

Would it be able to run without the sparkplug when glowing red hot (Dieseling effect)?

Is there any compression of air before it enters the combustion chamber pulsejets? if so how is it compressed ?

@EnglishTurbines That particular video was running on a nearly empty, cold tank, so it was not at max throttle. At max throttle it is much more like the videos of the 4lb thrust engine, with distinctive shock wave pattern in the exhaust. The engine will put out approx 14 lbs on liquid fuel like methanol, you dont fly with propane. Propane is simply a clean easy no mess no fuss fuel for ground tests and demos. You dont go home smelling like kerosene at the end of the day.

@EnglishTurbines The evaporative cooling from methanol results in a much higher fuel charge density, combined with its rapid burn speed, result in much more thrust output.

yes it can

is it able to install on an rc jet plane? its usually the valved ones that go on them. so if you can put it on a rc plane, do you use a fuel other than propane?

times even the air trying to put into rotation? should bring more power

@BeckTechnologies oh okay. Cool man. Hey how much thrust do you think it's putting out?

jeez it got hot did u try to measure the temperature with temp gun ??? bet l=its like 1000F

a chamber (combustion chamber) gets filled with gas, (the end bit thats fat on this video) then a spark plug ignites it all and the gas creates a big bust of air (also can be provided by air compresser) that pushes a continuous flame out the flame tube. the spark plug doesnt have to be sparking at a constant cus the flame from the first fire keeps it going. and the gas has to be flowing at a continues flow. any more questions about em?

could you use a soup can as the chamber?

nice for a rc V1 ;)

Question did you leave the sparkplug on

what size is the diameter of the tie pipe and combustion chamber and how long is the tail pipe

i was waiting for the spark, propane tank & boooooommmmm, seriously though how would you fit that in a model with out it catching on fire

I found this in Gmod. I tried to stop it and you killed me!

@rocketlauncher9308

9 жыл бұрын

"And you killed me" how did he kill you? This isn't a game! Someone probably just made a jet in Gmod and uses it.

Does the small 4lb thermojet start by itself as well?

Which type of valveless pulse has the most thrust when made right?

how its looks like from inside?

I bet the birds shut up fairly quickly! :)

@BeckTechnologies Why don't you make a video showing the performance difference of the same engine with different fuels?

how would you trasmit this to movement

It breathes air? and if so, where is the intake?

You can always purchase directly even if I do not have any ebay auctions going. I am currently boycotting ebays high fees, ridiculous feedback policies, and the extra fees on top of fees.

What type of spark plug is required?

But will it blend?

Please, can you help us about Pulse-jet Ignition System ?

How much would it cost for a thermo jet a little maller than thisone. Say 6-8lb thrust with the gas intake nozzzles as well?

I think there's a small hole in the chamber at the back.

does the construction have to be stainless steel? or will mild steel do?

THAT LOOKS HOT!

i dont know much about the abilities of mixing gases but there seems to be an argument over using methanol or kerosine. is it possible or has anyone tried mixing the 2 to creating a different type of burning process? more of a curious question.

How much thrust do you think this puts out?

would an engine of this size even be capable of running on a model aircraft using propane? (the small propane or MAPP brazing cylinders come to mind) or would that not produce enough fuel for any significant amount of flight time? also, whats the rough diameter of that combustion chamber? 6in? more? is the 10lb of thrust a figure only attainable under ideal "bench-test" configurations, or could u actually get that on a flying model? thanks!

Well Done, where could I get some dimentions for one of these? Do you sacrifice mutch thrust using valveless?

Hy, I plan to build such an engine myself-valveless...and I had a few ideas of how to improve it!What's do you think about: 1. A ceramic (or asbestos?) coating inside the combustion chamber. It would protect the outer metal shell and it would increase the combustion temperature thus increasing the fuel efficiency and power? 2. A turbo, powered by some exhaust that would in turn send compressed air into the intake? 3. Linking 2 eng. in a series? exhaust to intake. Thanx, Alex C

Know how much heat a car engine and jet engines put out? The flame of a gas turbine can be as hot as 2000 degrees celsius.

Where is the fuel line going in to the engine at

That's hot

Is it possible to make this in a bigger scale say maybe 2-3 times bigger. I have donloaded your prints an all im just wondering if it wont be any problem? maybe use thicker steel? is liquid fuel ok?

Cool motor you sound like Tom Green ha 🤣