I think what I may do in just cap a piece of vinyl tubing, drill different sized holes in it, and see what kind of precision I can get with the different diameter holes...

what is your chamber size?

I plan to use this system initially for a small gun to shoot .50 cal paintballs and other ...

Do you think a 3/8 inch nozzle would be small enough?

I have considered injecting compressed air aswell, but I am having trouble decideing between that and a simple chamber fan to suit my needs. And yes, lots of trial and error for me! I plan to use a gradulated cylinder and a bucket of water to dial in the amount of propane released.

Hi!
I am building a fuel injection system for the gun I'm building. It employs a solenoid valve that will soon be controlled by an arduino board. I plan to solenoid valve to the chamber with barb fittings and tubing. Do you think I will have issues with hot gases entering/ blowing of the tube ...

Cartridges seem more complex than I was aiming for, and may well be above my skill level... I think I may start with a simple combustion, and then work my way up to a hybrid if need be. Also I have tried to download HGDT but failed to get it to run. It kept saying missing file. Thanks for all the ...

I was looking for something that could be reloaded very quickly, within a few seconds. This why I was leaning towards combustion. What fps could I expect from a simple combustion? Could an oxidizer not be used to increase the power? What material would be proper for a hybrid? I have read sch40 steel ...

Thanks for all the info! I was trying to avoid pnumatic, because I don't want to have to lug around extra equipment. I also don't own a compressor.

Hybrid is a possibility... I would assume I could build a combustion gun and later adapt it to be hybrid, correct?

What velocities could I expect ...

Hi there,

I have build one potato cannon before, but I have a few questions before I begin building a second. The first cannon I build was combustion, had a one inch bore, piezoelectric ignition, and shot pretty well. On this new project it will also be combustion, but I would like it to be more ...