i have a hack saw, but i might as well have them cut in 30 sec then me cutting . they usually cut other stuff for free

yep, i just gotta ask my home deopt if they will cut the tubes to specified lengths, i have no metal shop or anything.

for a BBQ lighter, what is a good length for the spark, right now im thinking of medium, to get a bright blue spark

low cost as possiable, i think ile go with an entirerly new combustion chamber, possiblly all metal, most of it being copper.

im trying to keep as low as possible, and i just found an weldeing kit

i wont be able to shoot fast, right now im getting the H/o2 mic directly from electrolysis.

well guess its time to find a better combustion chamber.... mabey one of those stainless steel water bottles? i saw it in instructions for a pulse jet.

1) i didn't epoxy, hot glued together. There are 3 copper tubes(small dia.) across the two cans to help it stay together. 2) how long of a barrel do you think ile need? i read there was a ratio for maximum efficency and a ratio for maximum power, whats the difference? 3/4th inch pvc will be barrel. ...

sorry, new to this, but pressure vessel = barrel?

Its not the storage you really have to worry about, its the flame front accelerating to a detonation

i don't get what you mean by that, ile get the dimensions now though.

EDIT: Dimesions are:
length 24.5cm
Diameter 6.5cm

in the center, it slants down to a diameter to about 5.7cm, than back up.

O.o my chamber lenght is like 4 times the the width. Im collecting the mix directly into chamber and firing right after, no hydrogen storage. Will be igniting well away from it, in case of explosion.

hey all, this is my first post, though ive been reading the forums for about a month. Everyone here seems smart and helpfull =) About two weeks ago, i got interested in electrolysis, and then the gun part. I made a small gun with a BB bottle as a combustion chamber and used a pen tube as a barrell, ...