use some other pulse jet diamentions and work out the eqations they use for example the tail pipe is 5 x chamber length and tail pipe width is 1/2 chamber width and intake width is 1.3333 x tail pipe width.
Go to w w w dot pulse-jets dot com and go to the forum. You might take a look at my videos of the $15 pulsejet I built... it started so easy it startled me.
I'll have to draw it up with my mods. Yours is a form of the Chinese design, but the ratios of sizes are important (acoustics involved) Google Advanced FWE pulseject and go to Eric Beck's site for another good set of plans.
First of all, if you using the small handheld (butane?) torch to supply fuel it probably wont work, not enough gas.
Next the combustion chamber is very long, assuming that it's about 11 inches long you could probably cut at least 4 inches out then weld the end dome back on.
Next extend the intake pipe so that the open end is at approximately 1/3 (one third) of the overall length. Then try to flare the ends of the intake and tailpipe.
ok, i have shortened the combustion chamber by 3 inches and extended the air intake by an inch. we have got the spark plug ignition system working and it will run properly without the ignition on. bur it still needs the compressed air. any ideas?
Have you tried to use the spark plug to ignite the mixture rather than the torch? are you using an unregulated propane supply? The combustion chamber may be too long. I sounds like it wants to run. The tail pipe should have a flare on the end. Try getting the propane to burn in the chamber without the air gun. Increase/decrease the fuel valve to see what it does. Then squirt air into the intake and it may start.
yer, i tryed the spark plug, but it couldent even light the torch, let alone the jet. i had it on very low fuel because if i turned it above a trickle, it would just go out.
the intakes are too narrow.
CKC90 4 years ago
use some other pulse jet diamentions and work out the eqations they use for example the tail pipe is 5 x chamber length and tail pipe width is 1/2 chamber width and intake width is 1.3333 x tail pipe width.
98209276 4 years ago
yer. i think i know why it didnt work. i had no plans, just based it on what id seen.
rapidrory 4 years ago
Go to w w w dot pulse-jets dot com and go to the forum. You might take a look at my videos of the $15 pulsejet I built... it started so easy it startled me.
I'll have to draw it up with my mods. Yours is a form of the Chinese design, but the ratios of sizes are important (acoustics involved) Google Advanced FWE pulseject and go to Eric Beck's site for another good set of plans.
KanzlerM 4 years ago
thanks, i will see. i had noo plans or dimentions for it, just guesses. probably why.
rapidrory 4 years ago
First of all, if you using the small handheld (butane?) torch to supply fuel it probably wont work, not enough gas.
Next the combustion chamber is very long, assuming that it's about 11 inches long you could probably cut at least 4 inches out then weld the end dome back on.
Next extend the intake pipe so that the open end is at approximately 1/3 (one third) of the overall length. Then try to flare the ends of the intake and tailpipe.
Hope that helps..
78James 4 years ago
tnx, i will
rapidrory 4 years ago
ok, i have shortened the combustion chamber by 3 inches and extended the air intake by an inch. we have got the spark plug ignition system working and it will run properly without the ignition on. bur it still needs the compressed air. any ideas?
rapidrory 4 years ago
Ist I'm going to say I don't know!
Have you tried to use the spark plug to ignite the mixture rather than the torch? are you using an unregulated propane supply? The combustion chamber may be too long. I sounds like it wants to run. The tail pipe should have a flare on the end. Try getting the propane to burn in the chamber without the air gun. Increase/decrease the fuel valve to see what it does. Then squirt air into the intake and it may start.
rons22SandA 4 years ago
yer, i tryed the spark plug, but it couldent even light the torch, let alone the jet. i had it on very low fuel because if i turned it above a trickle, it would just go out.
rapidrory 4 years ago