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Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Is it Beast or is it BEAST?

Poll ended at Mon Dec 29, 2008 2:51 pm

could use some work
10
77%
looks great
3
23%
 
Total votes : 13
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Unread postAuthor: qwerty » Mon Aug 24, 2009 11:17 am

It sounds like your dealing drugs :shock:

Happy to be of assistance :wink:
If you are going to make one for you first i recommend a coaxail gun because i found them alot easier to make than Ts.
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Unread postAuthor: Technician1002 » Mon Aug 24, 2009 5:12 pm

DR wrote:I agree; It would be nice to know the length/diameter of both the chamber and the barrel.

I don't see a hacky-sack going 'a couple hundred yards' at only 40psi with that cannon, sorry. :roll:


I disagree; - Guessing at both and playing with GGDT ( 40psi/ Generic Valve / 100-500ms Valve Open Time/ Flow Coef from 70-90... I get upwards to 200fps (136 mph)

A hackey-sack is typically 4-5cm in diameter / 50 grams ... I could imagine that flying pretty far.

I DO agree, that most will mistake "yards", for feet - when bragging about performance of their launcher. :wink:[/quote]

A couple hundred feet is believable. Take it to the local football field and launch it over the goalpost towards the other goal post and let me know if you get it over both goalposts in one shot.

I have gotten stuff over a couple hundred yards, but not at 40 PSI and not with a ball valve. :D

Edit, removed extra quote. Thanks Thunderlord.
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Last edited by Technician1002 on Tue Aug 25, 2009 6:39 pm, edited 1 time in total.
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Unread postAuthor: THUNDERLORD » Mon Aug 24, 2009 5:53 pm

@Tech, your MrC quote includes DR's statement...
Not that anyone appreciates quotes of entire replies anyway.
Confusing, misquote really.
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Unread postAuthor: Tcoz370 » Tue Aug 25, 2009 12:55 pm

Yea there is a huge differance between a modded sprinkler valve and ball valve. The only way you can semi decent results from a ball valve is to clamp a pole to it so you have leverage and open it a lot faster.
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