Introduction: Pulsejet-thermojet Engine

Picture of Pulsejet-thermojet Engine

Hello everybody after a long time iam posting a new instructable. Now this is my brand new design expected to produce 35pounds of thrust.
This is my new pulsejet engine made in mild steel 3.5mm thickness the expected thrust from this engine is 35pounds,but still i didnt conduct the thrust test. I will conduct both thrust test as well as TSFC test and post the video as soon as possible.

In this video you can see the engine running at low throttle i didnt upthrottle the engine because at low level itself the sound was too high and neighbours started complaining. So sorry for not showing the full power of the engine. I will post the dimensions as soon as possible.


amarsajjad1994 made it! (author)2016-04-25

Hello ganesh. My name is Amar and i really need your help regarding thermojet. I made 12lb thermojet using 1.5mm stainless steel 316 and i used LPG as a fuel. The LPG cylinder has adjustable regulator which can make gas flow upto 2 bar. I am using normal single head spark plug but its not working. Its not even igniting. Then i used a compressed air but still it did not ignite and didnt start. I dont know what the problem is maybe the fuel air mixture is not good. Now i am going to use fire crackers instead of spark plugs and see if it works. Please help me in this matter it is my uni project. I can also send u the dimensions of my engine

tanmay2368 (author)2014-01-30

can u upload its plans\blueprint , how long is the exhaust pipe

rimar2000 (author)2011-12-03

Good work, really!

What thing are those two little tubes parallel to main?

Did you try it without intake pipe? It is to say, the same tube be intake and exhaust alternatively. I think that must work, and simplifies greatly the making.

ganuganu (author)rimar20002011-12-03

thank you, the two little pipes are intake pipes. If i should use the plan as you said then i have to place the intake pipes in forward direction.

rimar2000 (author)ganuganu2011-12-03

No, no. I say the intake pipe be the same exhaust pipe. I suggest to remove them, directly.

ganuganu (author)rimar20002011-12-03

thats a tough job. I dont know whether it works or not.

rimar2000 (author)ganuganu2011-12-04

My idea is very very simple, attach a drawing.

The air get in after each cycle because in the inner chamber there is a strong vacuum. You must have a valve in the fuel intake to avoid the backward motion of the fuel. The frequency of the spark plug must be controlled to suit that of the pulses (it can be a multiple).

The flow in the tube will be alternate, but the thrust will be positive, as works the pop-pop motor.

I don't make one of these because I have many neighbors!

ganuganu (author)rimar20002011-12-04

you are saying about a valved pulsejet but iam purely interested in valveless pulsejet engines. Valveless engines have zero moving parts.

rimar2000 (author)ganuganu2011-12-05

No, no, no. My design has not valves. It is valveless, as yours.

I suggest only a very little valve in the fuel conduit to avoid the backward motion of the fuel, but that is not for air intake.

ganuganu (author)rimar20002011-12-07

There wont be any backward motion of fuel, if it prevails then the cylinder should have exploded.

Kiteman (author)2011-12-03

Those feet at the end - do they belong to the complaining neighbour?

ganuganu (author)Kiteman2011-12-03

yes and some were standing near our house..

Kiteman (author)ganuganu2011-12-03

You're going to have to get the jet out into the countryside...

Oh, if you're expecting 35 pounds of thrust, that might be enough to push a small boat!

ganuganu (author)Kiteman2011-12-03

yes, but iam not going to fix it to a boat instead to a bicycle.

About This Instructable




Bio: hello everyone iam steam turbine design engineer. My hobbies are making pulsejet engines,stirling engines,animations.
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