Dynajet spudgun?

[MaxuS]

It would be worrying for me it my spudgun actually glowed brightly with heat, so how hot does it get?

[Tom]

I have seen them to, there is even a website how to buildt one(valveless pulsejet go-kart). But in my opinion they are too big, with a jet engine you would catch less air resistance
GR.Tom

[octane89]

Id say draw up some ideas, post them here, see what people say, and do as you please. You seem to know about PJ's enough to trust yourself with this so give it a try with some sketches.

[jimmy101]

I think it would be pretty tricky to get this to work.

Most valveless pulsejets (and, i assume, valved jets) cycle at a couple hundred times per second. Obviosly that is way too fast, for no other reason than it'll get too hot.

If you slow the ROF down to say one shot per second then you really don't have a "jet". Simply an auto cannon, one that refills with fresh air automatically.

You might be able to get the reed valves to work to automatically let fresh air into the chamber but the reeds will have to be substantially stronger than what is used in a reed valve jet. The jet operates at fairly low pressure, perhaps only a couple PSI above ambient. A spudgun is going to be hitting peak pressures of at least 50 PSIG. I would think the typical reed valves used in a jet would be trashed the first time there was a round in the barrel and the pressure rose high enough to actually launch the round.

[thespeedycicada]

No the valve will not be trashed they are made of steel that is thicker than soda cans and soda can burst discs blow at a higher temperature than a combustion will create.

[Novacastrian]

No i have not used my jets in planes and probaly never will as these planes can reach 200+ mph! Besides my jets are valveless like the one below.The dynajet produces around 4 lbs of thrust and is about 1 lb or less in weight.I most likely will start this project tommorow but morre comments/suggestions will be appreciated the prototype will be pvc to test the theory.I also encourage some of you guys to get into pulse jetting its reallly addicting seeing a heavy tube get red hot in 15 seconds with enough noise to blow your eardrums.Ahhh the two of the most dangerous hobbies ever,spudding and pulsejetting.

Sounds like just the thing i need to piss off my neighbours
Not illegal and "Perfectly" safe!