thanks for the psi number, and yes i can still access my fan and i will try to go and get one of those personal fans. but will they fit in my 2-1/2 in chambers? thanks

ok everybody, i figured out the volume of the meter pipe, it is 79 cc. i do have a chamber fan and yes it is very close to the end plug but it still moves a little air, but i don't know how many cfm it moves because my dad found it in my grandma's old computer and gave it to me. also, thanks on the ...

hope you guys like my first cannon.

i do have a chamber fan in the cannon and i let it run while i inject the propane and while i am trying to shoot it. i will try to get a picture up so you can get an idea of how it works.

my barrel is about 6-1/2 ft long and i think its 2-1/2 in thin wall (pop-can barrel), also my chamber is a dual chamber (side by side) so all of the fittings and pipe combined probably come out to about 98 in, but i do know the displacement of the combined chambers is 462 ci because me and my buddy ...

i have done a liquid displacment test on my chambers and it is 462 ci (i am using 2.5 in sch 40 pvc), but i have not done a displacement test on my meter pipe. also, some of the pressures i have tried so far are 17, 60-70,90, and 110 psi. are those pressures too low, or do you think i need to put mo...

i have tried using that calculator and the pressures it gave me didn't work. i don't know what the problem is the ignition works fine, it has been checked numerous times. i just don't know what the problem is.

hi, i have just finished building my first propane cannon and i need help with the meter pipe. i have a meter pipe made that is 14 inches long and made out of 1/2 in sch 40 pipe. my total combustion chamber size is 462 cubic inches. i cant seem to get a pressure that will ignite. if someone could he...

if you have pics of your metered propane potatoe guns post them here. thanks

i was wondering more along the lines of puting in my chamber dia and length and barrel size in some sort of calculator.

where can i find out what fps my gun shoots at? thanks

what size chamber would you say for getting 1000 ft out of it with golfballs and also i was thinking of making interchangeable barrels for marbles too, how far do you think they would go. thanks
PS: i was thinking of using electric soleinoids

also one of my friends is a senior in high school and has been building them for years and he is going to help me build it. he has built pneumatics, combustion and is building a hybrid.

how long of a barrel do think i should use. i was thinking of using 4 soleinoids for fast release.i am going to use 100 PSI. i am new to this and am not sure what to use.

PS: would this work or am i just going to have it explode?

how about with a golf ball as a projectile and a chamber 2.5 inches dia. and 1 foot long.