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Your best performing piston according to GGDT?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Your best performing piston according to GGDT?

Unread postAuthor: boyntonstu » Tue Apr 13, 2010 8:20 pm

What was your highest flow coefficient valve you built?

If higher than 50% please describe it.
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Unread postAuthor: c11man » Tue Apr 13, 2010 8:24 pm

so do you want answers to the first or second question becuase they are completly different
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Unread postAuthor: Technician1002 » Tue Apr 13, 2010 9:25 pm

QDV in the short fat chamber is well above 50%. GGDT won't model a 1:1 OD diameter to seat ratio valve. Using in barrel accelleration data, the valve models like a burst disk.

http://www.spudfiles.com/forums/ggdt-an ... 18090.html

Due to the way the trigger rod slides inside the piston, the piston is struck, so the initial opening is much faster than a regular piloted piston valve.
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