yes metered! like to go with 3.5%, because this is the most reliable i got from butane in the past.
technician i know about the data from burntlake is incomplete and hgdt tells that more chamber volume = more power....
that makes this all so difficult
find the right lenght of the chamber is meaning that i have to bring many parameters into the calculation.
my given parameters are
4" chamber id
1.7" barrel id
2" barrel od
16" barrel lenght (spare part and fixed in lenght)
proj.weight 1.5 oz
butane (metered)
coax
fan
2-3 ign. points (taser 30000v)
i dont know what i should do now......
the range is 0.5:1 to 1.5:1 so far.
i need a compromise between power and noise...with a tendence to less noise.
maybe i will shoot this thing in a big 10 yard garage(noise) in an urban area.
jean
oh and the cannon is in progress now see the pics
and give you advice