Long a$$ marble cannon

[rna_duelers]

I plan to make a long marble pneumatic cannon useing a modded sprinkler valve and 6' of 1/2"pvc pipe and a 2' piece of 2" pipe for my chamber.I was wondering if some ine would be so kind as to GGDT at 120spi so i can see the distance and fps it would be greatly apreaciated.Ohh and does a marble fit cpvc better or pvc?

[Benny]

lol, GGDT said 37 fps with a 50 gram projectile and 100 psi, and it said the barrel was chocking flow.

[rna_duelers]

BAHAHAHAHA..lol,thats quite funny.But a marble isnt 50 grams is about 3-4 grams...But still thats shocking..lol

[taterjim]

You can use cpvc without drilling it, The 1/2" pvc I also use is drilled with an 11/16. I have a marble cannon with a similar design to the one pictured and I have it mounted on a home made wooden stock . I installed sights on it.
It's kind of long but shoots really well. My other one is an under over design. The under over is a little easier to hold and shoot and has a longer barrel with yet a much shorter overall length.