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Monster tennis ball gun

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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Unread postAuthor: hoarp001 » Tue Jul 22, 2008 4:18 pm

Quick update:

I just shot an empty coke bottle, 763mph. 2mph over the speed of sound, 100psi.

Just uploading a video now il post the link when its done.
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Unread postAuthor: hoarp001 » Tue Jul 22, 2008 4:43 pm

http://www.youtube.com/watch?v=qpVNyBJx94c

Video.

Note how the backstop flew backwards. If the MDF board was supported better, im pretty sure the bottle would have compleatly cleared the board.
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Unread postAuthor: DYI » Tue Jul 22, 2008 5:21 pm

With the chrony so close to the muzzle, the blast might be affecting it. Try heavier projectiles from farther away, and see if you're still getting higher readings than GGDT predicts.
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Unread postAuthor: THUNDERLORD » Tue Jul 22, 2008 5:23 pm

hoarp001 wrote:http://www.youtube.com/watch?v=qpVNyBJx94c... If the MDF board was supported better, im pretty sure the bottle would have compleatly cleared the board.


One way to find out. :wink:
Pretty amazing for an empty bottle! 8)
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Unread postAuthor: hoarp001 » Sun Nov 02, 2008 6:43 pm

Hello again,

After afew months of nothing, I took the piston out and re-greased it and cleaned it up. Turns out that a highly greased piston increases power by a good margin.

Heres a recent video:

http://uk.youtube.com/watch?v=UpHg3vmesug
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