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Help with my gun

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Help with my gun

Unread postAuthor: bennettjackson » Tue May 31, 2011 10:18 pm

hey everyone, i know this might be a bit much to ask for but is anyone willing to help me out if i send them my gun(detachable barrel so not too big) to try and dial in the right amount of pressure for my propane, i just cant seem to get te effeciency down. anyways it would be much appreciated, thanks
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Unread postAuthor: saefroch » Wed Jun 01, 2011 4:34 pm

For the right amount of money, we'd do almost anything. :wink:

It would be FAR cheaper for you to just state the problem more clearly so we can help you over the interwebz. By the wording of your post, I assume you have a meter, no?
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Unread postAuthor: bennettjackson » Wed Jun 01, 2011 4:54 pm

yeah i do, and i have a 6"x1/2" meter pipe going into a 17x4" chamber, currently i have the pressure set at two shots of 40 psi amd the first time i use it i get a decent launch but as i keep using it, it continues to decrease in power. then i let it rest for a day and its fine again, but i thought propane was supposed to cure the efficiency problem
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Unread postAuthor: Crna Legija » Wed Jun 01, 2011 10:40 pm

bennettjackson wrote:yeah i do, and i have a 6"x1/2" meter pipe going into a 17x4" chamber, currently i have the pressure set at two shots of 40 psi amd the first time i use it i get a decent launch but as i keep using it, it continues to decrease in power. then i let it rest for a day and its fine again, but i thought propane was supposed to cure the efficiency problem



do you vent the combustion gases after each shot?
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Unread postAuthor: bennettjackson » Thu Jun 02, 2011 6:34 am

yeah, for how long?
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Unread postAuthor: Crna Legija » Thu Jun 02, 2011 6:52 am

bennettjackson wrote:yeah, for how long?


idk your the one doing it
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