My QEV copper cannon

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
spanerman
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Sun Apr 01, 2007 11:39 am

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

thats a nice gun but id take it to 200 psi
spanerman
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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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joannaardway
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Sun Apr 01, 2007 3:01 pm

I think you mean 2300kPa.

23kPa is almost nothing.
Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
spanerman
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Sun Apr 01, 2007 3:04 pm

yes i do, or 0.23MPa, my bad
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MrCrowley
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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
spanerman
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Sun Apr 01, 2007 3:22 pm

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

That would be 2.3 mPa.

Again, .23 mPa isn't a lot (about 30 psi.)
Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
spanerman
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Sun Apr 01, 2007 3:28 pm

damn, got it wrong again. runs off to physics folder.
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chaos
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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?
spanerman
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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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jackssmirkingrevenge
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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
Last edited by jackssmirkingrevenge on Mon Apr 02, 2007 6:24 am, edited 1 time in total.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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MrCrowley
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Mon Apr 02, 2007 5:31 am

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

Hmm, you could probably get 23 kPa from a balloon pump.
Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
spanerman
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Mon Apr 02, 2007 6:37 am

28mm!!!!
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should be solderd today
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