Good C:B Ratio?
Just finished my tennis ball cannon, and realized that my C:B ratio was probably way out of whack. ATM: MY 4'by 2.5" barrel has a volume of 235 CI, my 3' by 3'' chamber measures in at 254. For a combustion the best ratio is between .6 and .8, What would it be for a pneumatic? about the same?
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Gun Freak
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It is fine.....
OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
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MrCrowley
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You can simulate any cannon design you want and receive estimated performance for such design using a program called GGDT. Any information you require about using the program can be found on the site so be sure to read it over before asking for help with it.
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Mr.Tallahassee
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Search the GGDT site. Depending on what model and size you have, there should be an accurate representation for the valve. I think it's under the "Archives" section.
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velocity3x
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For high pressure, I prefer a CB of 1:1Gidney14 wrote: For a combustion the best ratio is between .6 and .8, What would it be for a pneumatic? about the same?
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Technician1002
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For low pressure, you want larger chambers. For high pressure, if the compressor supply is not an issue, large is good, but has diminishing returns. For hand pumping, a smaller chamber can reduce performance a little while cutting the workout on the hand pump to a managable workout.