Gun Freak wrote:And SB15, thanks for the link, it helped a lot. Did you use floating o-rings?
Yes, the design was a floating o-ring type.
How much less was the OD of the washer compared to the ID of the o-ring?
IIRC, the o-ring had an ID of 5/8", and floated around ~1/2" diameter washers. That leaves a ~1/16" gap between the inside of the seal and the inner washers.
How much could the o-ring move up and down on the shaft?
The o-ring thickness was 3/32", and the spacing between the upper and lower steel washers was about 1/8".
Ok so the O-ring had plenty of space between its inside and the washer, and also had wiggle room. How much did you have to squeeze your o-ring into the main pump body? was it a perfect fit or did you have to squish it a little? And which is more ideal?
I guarantee a shock pump will not be worthwhile for a tank that large. My vote is definitely with a stirrup pump (aka bike pump). You'll have to use it when you get a chance to rest, but it's the only real option.
So you're saying making a small stirrup pump to use as a hand pump would not be a good idea?
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Last edited by SpudBlaster15 on Thu Jul 15, 2021 1:15 am, edited 1 time in total.
A stirrup pump is good because you can use your weight over a medium area to get high pressure quickly.
If you made a small hand-held stirrup* pump, you would have to make it a much smaller area to get the same pressure, which would happen very slowly.
I tried using a shock pump to fill my smallest cannon, and it took a very long time and was still hard to reach 300psi.
*The name stirrup pump comes from horse-riding, where the stirrups are used to place the feet in to balance. When you stop using your feet to balance the pump, it is no longer a stirrup pump.
Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety. -Benjamin Franklin
It's too loud, and I'd have to go buy one, hook up electronics and hoses and more fittings. Too much money. Plus, with my reg that I put on, I don't think I'll need it. I fixed my reg btw
clemsonguy1125 wrote:well the most practical idea would be a 12 volt compressor hooked to 8 AA's
not really, those things are p.o.s. for one thing, not to mention that unless you got lithium batteries(or similar) it wouldn't last more than a couple fills
well walmart has them for like 10 bucks and they hook t a schrader and all you need is a few alligator clips, plus one you fire the gun people will know where you are, and the compressor can pump while you run
clemsonguy1125 wrote:well the most practical idea would be a 12 volt compressor hooked to 8 AA's
not really, those things are p.o.s. for one thing, not to mention that unless you got lithium batteries(or similar) it wouldn't last more than a couple fills
Then I "mies" well carry a damn generator in my backpack along with it
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