SpudFiles

I made that fire extinguisher tank the other day. Now, I need a mobile way to pump it up when I run out in an airsoft war. A bike pump is too big... but it is an option. I can strap it on my back and use it when I get a break. A small hand pump is an option, but can't reach high pressure. A shock pump is an option, but it might take forever to pump up which is not ideal, but it is small and I can put it right on the tank which is good. A small compressor in my backpack would be another option but I really don't want to do that because of 1)the noise, and 2) the bulkiness and the need for a hose to the gun. I can also build a small hand pump, but I don't have a lot of experience with that and it would probably turn out to be a disaster. I need more suggestions. Thanks, ~GF~

strap some spring loaded mini pumps to your feet and run!

On a more serious note...
A long stirrup pump. The strokes would be easier and could reach higher pressure. The problem with bike pumps is that they are easy to pump on the ground, but when you mount it it becomes really hard to pump

Isn't a bike pump a stirrup pump though? When people say "homemade stirrup pump" all I see is a "homemade bike pump". Is a stirrup just like a big shocky?

how bout a hand crank pump? Get a cheap 12v compressor and modify it so instead of using the motor thats geared down, you can just use a little crank handle. I think boytonstu might have posted something about that.

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strap some spring loaded mini pumps to your feet and run! Laughing

I was thinking the exact same thing lol.
i would use a shock pump or a small bike pump strapped to the side.

If you want a bike pump the Giyo air pump that i use is easily one of the best spudding pumps. It really isnt that hard to pump to 300 psi taking only about 9-10 full strokes. Its highly reliable as i have used it at 300 psi over 350 times with not one fault or breakage, i will be buying another 2 as back up pumps and at only $60 thats pretty damn good.

Edit: You could always mount a reciprocating saw attached to a shock pump and pump away lol

Lockednloaded wrote:strap some spring loaded mini pumps to your feet and run!

That actually sounds like something worth working on! Say you weigh 130lbs, with a 0.5" diameter pump you could potentially take a chamber to well over 500 psi with direct pressure while running even more if you come up with a lever system. It would probably look rather silly, but it could certainly be made to work.

LOL look... you just have to replace the two air springs with pumps

Lol, they're pump stilts
I think I'll go with a stirrup. However, I won't be using it on the ground. How easy should it be to pump to MAX 150 psi? And SB15, thanks for the link, it helped a lot. Did you use floating o-rings? How much less was the OD of the washer compared to the ID of the o-ring and how much could the o-ring move up and down on the shaft?

Gun Freak wrote: How easy should it be to pump to MAX 150 psi?

well on my pump it doesn't get too difficult till you reach about 300psi, but then again i am 240#'s, it all depends on the diameter of your pump, on my 3/4" pump i can pump to 150psi with one hand.

I'm thinking 3/4" copper or similar material. Most likely copper because it is cheaper thank buying a nipple, it has a smooth inside, and that is what most people use on their pumps so I know it works good.

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.

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