Instructables

How to build your own Jet Engine

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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 http://www.badbros.net

This information is brought to you by Bad Brothers Racing and Gary's Jet Journal
http://www.badbros.net
http://www.garysjetjournal.com

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

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.
chriswillb5 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.
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.
hawksky acolombe6 months ago
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.
kschmidt2 hawksky2 months ago

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.

hawksky kschmidt22 months ago

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.

twashmon acolombe5 months ago
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.
I know this is old, but most aircraft engine parts that are part of the combustion/exhaust system are usually made of titanium for it's weight/strength ratio. Aluminum is used mainly in the structure, where high temps aren't an issue
gee i think we have an aviation expert on our hands here
actually, hes right... the plane is made of an aluminium alloy, the engine isnt, it would be idiotic to build it out of aluminium, it will not hold up.
thats what im going to wrap around the engine when i build my ultralight plane wich i will build out of aluminum
atatistcheff2 months ago
One of the URLs in this article is non existent and one is hosting malware. They need to be removed.
bobdude3 months ago
very dangerous...
how fast does your "toy" go?
rohitbansal7 months ago
will aluminum will work beter thn steel??
Whatever you do, please do not use aluminium for core internals. As others have mentioned, aluminium melts at a far, far lower temperature than steel, and also lacks a lot of strength that steel has. Also, where aluminium and ferrous metals interface, severe corrosion occurs if any condensation is touching both the metals.
ShikenNuggets10 months ago
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
dustyrik1299 months ago
does it power enough thrust for a small homemade single engine ultralight aircraft
i just wanna now if there is more application for that jet engine wich could be useful for daily life ?? plz give an answer
BoltZ mustafahood10 months ago
If you use LPG/BBQ gas a fuel; place the gas tank in a container/tank large enough to support the tank and enough beers for you and your mates. Fill the tank with water, and add the beers. Run the jet engine at full blast for approximately 5-10mins. The gas bottle while operating the jet will absorb the heat energy from the beers and surrounding water in the tank, leaving you with nice frosty beers. Enjoy.
I am trying to build this, but right now I am having trouble find an ST-50 or a similar sized turbocharger, can you list any others that would be similar in size? Also, what is the inducer is 3 inches and the visible blade diameter is about 2.18 inches, will that give me enough power to move something light like a bicycle? And why can't you have a divided exhaust, I've read that the split helps improve power?
BoltZ kevineleven10 months ago
You can use a divided exhaust turbo; I completed an engine from these instructions last weekend using a turbocharger from a Caterpillar 3406 engine; the turbo has a divided exhaust and worked a treat.
I am trying (somehow) to put this together with a waveboard to make it hover at least a foot. can anyone help?
How is this project coming?
115 lbs of me, plus at least that much in fuel and engine, not enough power to hover..... :(
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:

From http://en.wikipedia.org/wiki/Newton's_laws_of_motion

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
force = mass X acceleration
Power to weight.
Fuel weighs a lot, engines more. You could, but check the price tag....
oh my god...
aryanchopda2 years ago
can there are any formulas for exactly calculating the combustion chamber and flame tube dimentions?? And the dimentions and number of the primary,secondary and tertiary holes ??? And also send the info of which kind of fuel injector and igniter has to use, from where they can be bought? my id: aryan.chopda@yahoo.com
aryanchopda2 years ago
hey, can anyone tell me what kind of fuel injector have to use in it?, and what kind of igniter have to use? And how we can buy or make them??? And also can there is any formulas to exactly calculate the size of combustion chamber containing flame tube. If anyone has info please send me.
neivadan2 years ago
i dont know about you but like to make non earthy machines like flying saucers and mecha even though am human lol !!!!
dciocoiu5 years ago
where on earth did you get your hands on an turbocharger?
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