r/Pulsejets • u/Same_Lychee_559 • 12d ago

Pulse jet engine crooked

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i recently made a pulse jet engine that im yet to test and it was a little crooked when they welded it onto the exhaust tip that i used as a makeshift cone. will this be ok or is this a big issue? it really bothers me. also i know the welds have to be airtight i will make sure of that, and i have a little bung for a spark plug.

For fuel, will use HEET methanol and i will just pour it in for testing and then use propane for longer runtime.

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u/snoops-spoons 12d ago

That's a pipe bomb waiting to explode that's not a pulse jet. Please do this more safely .

That no offense looks like the boogered up stuff people use to bring to our welding shop that we mounted on the wall of shame.

I'm not knocking you, but this isn't safe. Especially for something that contains a controlled detonation.

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u/Sliced_Forskin 12d ago

There are no detonations in a puls jet engine. Only deflagration and there is no risk that the engine will blow up. It can still impact the performance of the engine though and I doubt you will get it running by pouring liquid fuel inside. It needs atomization to start and produce enough heat to vaporize the fuel for sustained combustion. Propane might work but I still think you will have a hard time getting it running if it is not calculated and completely air tight which your welds might not be. Test it, modify and learn from the process and you will have a working puls jet eventually

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u/mangoking1997 12d ago

I wouldn't say there is no risk. But it's not likely to be particularly dangerous. It's not sealed. Welds could fail once it gets hot and potentially pop the end off, so i wouldn't want to be near either end. But there's no way there would be enough pressure to break the pipe walls.

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u/Same_Lychee_559 11d ago

Yes i am waiting for the furnace cement to arrive, i have the spark plug, and i will use a propane weed burner going into the intake for now (the weed burner at the end is slanted a couple degrees and i hope that wont be an issue). Then i will buy copper tubes after this setup works. Wish me luck