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My QEV copper cannon

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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Unread postAuthor: spanerman » Sun Apr 01, 2007 11:39 am

made some impovements today...
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Unread postAuthor: Kenny_McCormic » Sun Apr 01, 2007 11:47 am

thats a nice gun but id take it to 200 psi
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Unread postAuthor: spanerman » Sun Apr 01, 2007 11:49 am

id take it to 23kpa if i had a pump that would do it
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Unread postAuthor: joannaardway » Sun Apr 01, 2007 3:01 pm

I think you mean 2300kPa.

23kPa is almost nothing.
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Unread postAuthor: spanerman » Sun Apr 01, 2007 3:04 pm

yes i do, or 0.23MPa, my bad
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Unread postAuthor: MrCrowley » Sun Apr 01, 2007 3:18 pm

100kpa = 1BAR
1MPa = 10BAR
700Kpa = 100PSI(Roughly)
7BAR = 100PSI(Roughly)
10BAR/1MPa = 145PSI
23Kpa = Jack sh*t :P
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Unread postAuthor: spanerman » Sun Apr 01, 2007 3:22 pm

yeah, my statement was correct :P id feel happy taking it to 250psi
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Unread postAuthor: joannaardway » Sun Apr 01, 2007 3:22 pm

That would be 2.3 mPa.

Again, .23 mPa isn't a lot (about 30 psi.)
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Unread postAuthor: spanerman » Sun Apr 01, 2007 3:28 pm

damn, got it wrong again. runs off to physics folder.
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Unread postAuthor: chaos » Mon Apr 02, 2007 4:00 am

man whats the c:b ratio on this thing?

have you considered using a blowgun for the trigger?
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Unread postAuthor: spanerman » Mon Apr 02, 2007 4:57 am

i have considerd a blowgun, i have used one, the perfomance suffers as the flow rate is so small, there is about a 1:1 ratio
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 02, 2007 5:20 am

spanerman wrote:id take it to 23kpa (edit: for which read 250 psi :P) if i had a pump that would do it


If you don't mind the effort, you can get yourself a mountain bike shock pump relatively cheaply, it'll be low volume so pumping up might take a while (I suggest you use your compressor first then top up with the shock pump) but the performance increase for specific targets is more than worth the effort :D
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Last edited by jackssmirkingrevenge on Mon Apr 02, 2007 6:24 am, edited 1 time in total.
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Unread postAuthor: MrCrowley » Mon Apr 02, 2007 5:31 am

Pretty sure it wouldn't take long to get to 23kPa :wink:
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Unread postAuthor: joannaardway » Mon Apr 02, 2007 5:57 am

Hmm, you could probably get 23 kPa from a balloon pump.
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Unread postAuthor: spanerman » Mon Apr 02, 2007 6:37 am

28mm!!!!
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should be solderd today
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