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Longest shot?

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: Redcoat » Tue Sep 11, 2007 5:10 am

Furthest shooting a whole potato out of a combustion= about 165m.
It was funny cause it went straight past the target and 4 houses down it splattered all over a real estate sign.
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Unread postAuthor: El Beasto » Tue Sep 11, 2007 9:44 am

MrCrowley wrote:Is that a ball valve? You should build a piston valve or even a 2" sprinkler valve would be better then a ball valve.


Yes...it is a ball valve. We never really got to experimenting with any other kind of valves cause we didn't know about them. Where could I get a 2" sprinkler valve? Would it noticably improve performance?
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Unread postAuthor: jackssmirkingrevenge » Tue Sep 11, 2007 10:05 am

Would it noticably improve performance?


Oh you have NO idea!

Yours for less than 60 bucks but I'm sure you can find it for cheaper.
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Unread postAuthor: El Beasto » Tue Sep 11, 2007 11:00 am

Thanks! Are they hard to install? Do you just glue it on and you're ready to go?
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Unread postAuthor: thespeedycicada » Tue Sep 11, 2007 11:08 am

dont worry its very simple but you have to mod it to get the most performance out of it just thread in a blowgun,screw it on to the male adapters on the barrel and chamber and your ready to go! the power increase makes a ball valve look like a nerf gun and oh yeah use lots and lots and lots of teflon tape!
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Unread postAuthor: williamfeldmann » Tue Sep 11, 2007 11:15 am

I used to build a lot of smaller ball valve pneumatic potato guns and we could always clear both goal posts on a football (american for you soccer nations) field at relatively low pressure 85ish psi. I have since moved into tennis balls.

My largest cannon will chuck a weighted tennis ball (I added sand to get the thing to 226 grams or half a pound) around 300 meters. I never accuratly measured but used the old 1 stride = 1 meter guestimate.
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Unread postAuthor: El Beasto » Tue Sep 11, 2007 1:02 pm

Yeah I'm scared to go above 80 psi on the schedule 40 6" pvc so that's as high as we're going.

Cicada, thanks for your help! I'll pm you if i need more help!
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Unread postAuthor: DYI » Tue Sep 11, 2007 3:10 pm

With a chamber that big, you should extend the barrel to at least 20' to get some real performance.
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Unread postAuthor: El Beasto » Tue Sep 11, 2007 3:20 pm

DYI wrote:With a chamber that big, you should extend the barrel to at least 20' to get some real performance.


Really? 1:4 ratio works well? Never thought about making it longer...I'll have to try that.
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Unread postAuthor: DYI » Tue Sep 11, 2007 3:29 pm

What is the volume of your chamber? I usually aim for .25:1, because I build barrels around a specific chamber, and aim more for power than practicality.

20' was a pretty arbitrary number, but you can't get pieces of PVC much longer than that. Also, C:B ratios are always expressed as _:1, to avoid confusion. As you probably know, the 1 is the barrel.
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Re: Longest shot?

Unread postAuthor: Dumbascii » Thu Sep 13, 2007 1:37 pm

With a potato, map landmark measured, the Taternator II will go just over 1000' with 2X MAPP, 8' long 1.5" barrel. Beyond that much power, I can't use potatoes because they liquefy. With other projectiles at 3X MAPP or oxy/acetylene, I can go well over 2000' but have not had a chance to do this at the measuring site - I'm hoping to be happily surprised.
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