Need help deciding on a pump

[Gun Freak]

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?

[SpudBlaster15]

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[Gun Freak]

Ok cool thanks for the help.

[Biopyro]

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.

[Gun Freak]

Ok so I might as well carry around my bike pump with me to fill it up. I can get to 120 psi fairly quickly.

[clemsonguy1125]

Yeah pretty much, the best idea Ive heard is to use a 12 volt compressor, with a crank or powered by batteries

[Biopyro]

Using a compressor with a crank is a nice idea but totally defeats the object of using a compressor instead of a pump!

8 AA batteries wouldn't be too hard to fit in a backpack, but I think the compressor itself would be the challenge.

[clemsonguy1125]

I think he said he didnt want the noise of the compressor, but it would be easier to crank than pump

[Gun Freak]

No I'm not doing that, I think I'll just carry my bike pump, it's the only practical idea.

[clemsonguy1125]

well the most practical idea would be a 12 volt compressor hooked to 8 AA's

[Gun Freak]

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

[spudtyrrant]

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

[clemsonguy1125]

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

[Gun Freak]

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

[clemsonguy1125]

Well you could probably hook up a couple RC batteries from Goodwill and find a cheap charger