Picture of How to build your own Jet Engine
You don't have to be Jay Leno to own a jet powered motorcycle, and we will show you how to make your own jet enigne right here to power your wacky vehicles. This is an ongoing project, and plenty of additional info will be available on our website soon. See the full build at

This information is brought to you by Bad Brothers Racing and Gary's Jet Journal

Warning! Building your own jet engine can be dangerous. We highly suggest that you take all appropriate safety precautions when dealing with machinery, and use extreme care while operating jet engines. Serious injury or death can occur while operating a jet turbine engine in close proximity, due to explosive fuels and moving parts. Extreme amounts of potential and kinetic energy are stored in operating engines. Always use caution and good judgment while operating engines and machinery, and wear appropriate eye and hearing protection. Neither Bad Brothers Racing or Gary's Jet Journal accept any liability for your use or misuse of the information contained herein.
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Step 1: Come up with a basic design for your engine

Picture of Come up with a basic design for your engine
I started the build process of my engine with a design in Solid Works. I find it much easier to work this way, and creating parts using CNC machining processes turns out a much nicer end result. The main thing I like about using the 3D process is the ability to see how the parts will fit together before fabrication, so that I can make changes before spending hours on a part. This step is really not neccesary, as anyone with decent drawing skills can sketch out the design on the back of an envelope rather quickly. When trying to fit the entire engine into the final project, the jet bike, it will certainly help a lot.

I would also suggest that to get the best answer to questions if you are attempting to build a jet engine or turbine based project, subcribing to a user group is the way to go. The years of combined experience from various users proves invaluable, and I am a regular on the Yahoo Groups DIY Gas Turbines forum.
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MarcusF5 months ago

okay i know this sounds stupid but im wanting to make a real working ironman suit but i need to know how to make to turbine small enough to fit the hand and feet so my suit can fly. i need some help. more or less hands on help.

Sorry to say, but you'll never be able to make it actually fly (for a couple of reasons). First off, if you make the turbines small enough to fit in your palm (literally), then they would not have nearly enough power to lift you off the ground. Second, Jet Engines produce huge amounts of heat, and so you would have singed hands if you ever tried. Also, Jet Engines need a large amount of air traveling (more or less) in a linear direction, so unless you have a large hole in your hand to allow air to enter the turbines, you would have a lot of trouble pumping through enough air. Lastly, unlike in the movies, controlling flight with the center of thrust(s) being the ends of your limbs is really difficult. Really cool idea though :)

This is actually wrong, anything is possible. The trick is having he lines stronge enoguh to support the pressure. As long as lift exceeds weight yo have flight. With .1% of atmospheric change you get 212 lbs of lift. Do with as you will!

jay4123 MarcusF28 days ago
Im pretty sure iron man doesnt yse simple turbine engines for his advance suit,one if the engines where that small it would not work and two in the movie he has flew in space and water.
How big would this be? Also how much thrust would you get? I was thinking about turning this into a jet pack or something?
check out my post im planning to build a jet powered ultralight and incase your wandering yes yes i am indeed a mad man
read my reply sir. basically you would be wasting money and time on that. for the purpose of jet flight on an ultralight, you'd want to go with the largest engine JetCat makes, and install 2 of them to power the ultralight.
does it power enough thrust for a small homemade single engine ultralight aircraft

I would not think so. The Engine would require a source of wind (I.e leafblower in this case) and a fuel source as well.

actually, it needs a source of ait, not wind. the leaf blower is only to start the engine to give it initial compresstion. once the engine is started, so long as you have fuel, you can theoretically keep the engine running indefinately...had it not been for reality of wear and tear of parts.

so yes, you could in fact use this to power an ultralight, but it would not be effective when you total the values of the weight for the engine. fuel, oil, and other components required to make the bird fly. you would just be better off installing 2 of the largest engines that JetCat makes.
JohnS10718 days ago

Magnesium parts are lighter

jay412328 days ago
Can some one please tell me everthing there is to know bout jet engines,i plan to be a engineer in aerospace tech when im older
RyanA73 months ago

I was curious if you discard the waste gate or what max pressure you use if you do utilize the waste gate ? Also how many CFM required to start engine as i see several 12v auto style blowers that provide approx 230 cfm.

Probably a really bad idea but would you be able to fix it to a gocart and what would be an estimated max speed?

hilalh7 months ago

hello. the jetspecs program is very useful but i need the long hand calculations of the flame tube holes to develop a better understanding. i have tried the link you have share above for those calculations but i can't find anything. can you please give me a current link and help me out regarding it?

ridalyn10 months ago

A note about aluminum, as the creators of the Bradley Fighting Vehicle can attest, when exposed to high combustion temperatures, it creates extremely toxic (read FATAL) gases. Be very careful if you intend to use aluminum for any of the core components of your jet turbine engine.

I am trying (somehow) to put this together with a waveboard to make it hover at least a foot. can anyone help?
f=ma my friend. it is the most important thing you will ever learn.
I'm assuming that f = either force or fuel. m = mass. what is a?
force = mass * acceleration. Newton's second law of motion.
i thought it was the third law of motion?
Nope, it's the second law:


Second law: A body of mass m subject to a force F undergoes an acceleration a that has the same direction as the force and a magnitude that is directly proportional to the force and inversely proportional to the mass, i.e., F = ma. Alternatively, the total force applied on a body is equal to the time derivative of linear momentum of the body

you are right, but never, never ever ever quote Wikipedia

ridalyn Rebreg10 months ago

That quote is a verbatim quote from my college physics textbook which predates Wikipedia by about 30 years.

force = mass X acceleration
How is this project coming?
115 lbs of me, plus at least that much in fuel and engine, not enough power to hover..... :(
Power to weight.
Fuel weighs a lot, engines more. You could, but check the price tag....

so i have looked in to these jet engines for a while now and ive found a designe for it and i am making a motorcycle version(most i have found for vehicles is a go cart type thing) so i want to know will the little portable grill propane tanks work im gonna use two of them on it one on each side to try and balance it better i just dont know if they have enough fuel for a short run or even that of driving it to like the store or somthing

please tell me how that works out ?

chriswillb6 years ago
Also can it be made out of aluminium
Aluminum is the best idea for a metal flying machine becaus it is so light and that is what they use on the big jets at airports so you don't have to worry about it melting of heat
I'm not sure if you guys have any experience working with metal or a whole lot of knowledge about metallurgy but steel would be preferable. I work with both a lot in my welding class, and though I like aluminum, it's not really all that strong and its melting point is about 1200 F, (which believe it or not isn't a whole lot for a jet engine) whereas steel's melting point is somewhere closer to 6000 F. It may be a little heavier but I think that since it's a stouter metal and more resistant to becoming liquid while you're trying to ride it makes it a better choice.

the melting temperature of steel is not that high, I melted a 2" thick jackhammer bit in my forge and it's not anywhere near that hot the melting temp of steel is closer to 3000 F

And if you get the bright Idea to use aluminum for some parts and steel for others bear in mind that anywhere aluminum and steel are touching will tend to cause both to corrode very quickly.
turbochargers have a steel turbine shaft that then has the aluminum compressor wheel attached to it with an aluminum nut. i have never seen one of these parts corrode like you have mentioned.
That doesn't mean it doesn't happen. Basically, aluminium is more reactive than iron. Where a ferrous metal (eg steel) interfaces with aluminium and there is water bridging the interface, it will effectively act as a shorted battery. In a nutshell, you're going to get aluminium sacraficing itself and corrosion occuring. Perhaps the internals of the turbo are kept real dry, hence you haven't witnessed the corrosion.

That part tends to spin pretty damn fast, so it would stay dry, any water that formed on it before it started would be forced to the outside, and as it compresses the air it gets hotter, thus it will start to evaporate if it hangs around.

That's true, but I'm sure most people stop the engine eventually. Moisture in the air could easily condense when the engine gets cold in the shed overnight.

it really depends on the parts man, some parts are not reaching extremely high heat, some are, for example, in a car, a forged iron piston is one of the best to use because its been tempered many times, and because of that, it is extremely strong, that is what they use in formula one cars;
however, a component such as an intake, can be very light as its not reaching as high heat as the pistons.
galvanic corrosion only happens when it is electrified though.
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