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Using Shock Pumps.

A place to ask general spud cannon related questions.
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Using Shock Pumps.

Unread postAuthor: Mitchza89 » Sun Aug 19, 2007 2:25 am

Does anyone have an idea on how long it would take to get 30cm of 1/2in Gal pipe up to a good pressure with a shock pump?
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 19, 2007 2:27 am

Probably around 2-3 minutes to take it to 300 psi.
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Unread postAuthor: Mitchza89 » Sun Aug 19, 2007 2:29 am

Crap... thats still a fairly long time. I wonder how many pumps that would be. Do you have any clue?
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 19, 2007 2:34 am

Never bothered counting but well over 100 - it's a good workout, trust me, and more socially acceptable than masturbation ;)
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Unread postAuthor: Mitchza89 » Sun Aug 19, 2007 2:39 am

Haha thats the one. I doubt I'll need to get to 300psi anyway. 200 should be plenty to do some good damage with a bb though :wink: but obliterating the target with 300 just sounds way too tempting haha.

Is it possible to go over the 300psi recommended limit and really get some high pressure?
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 19, 2007 3:11 am

The highest I ever got (estimated as the gauge only goes up to 300 psi) was around 425 psi, I can't see your average person doing more than that with a small shock pump. With specialist (and correspondingly expensive) stirrup pumps used for commercial pneumatic rifles you can go up to 3,000 psi easily.
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Unread postAuthor: Mitchza89 » Sun Aug 19, 2007 3:17 am

425psi?! Your arm would have been feeling pretty lousy after that. After I make my bb rifle, I'll make a bb piston handgun just for fun. I'll make the chamber small enough so with the shock pump, it'll get up to pressure real quick.

I saw one of those 3,000psi pumps on ebay... Not exactly within my price range...
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Unread postAuthor: noname » Sun Aug 19, 2007 10:08 am

400 psi takes around 3-4 minutes with my airsoft rifle, which has a 1/2" x 8" chamber (and a coaxial barrel). 300 psi took 1/2 to 2/3s the amount of time.
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Unread postAuthor: f.c » Mon Aug 20, 2007 5:41 am

air compressor would be the best opinion. or regulated co2.
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 20, 2007 5:44 am

f.c wrote:air compressor would be the best opinion.


It depends, for a large calibre launcher with a large chamber a compressor is ideal, but for small high-velocity BB pneumatics, high pressure in a small chamber gives the best results, an for that (unless you get a very expensive high pressure compressor) a small shock pump is the most cost effective filling method.
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