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Building your own pump

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kik128
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Building your own pump

Postby kik128 » Mon Jun 20, 2005 2:01 am

Hey all,

Does anyone know where I can get info on building your own pump out of Plumbing pipes ?
Winds Suck now so gotta keep busy.

I understand white water rafting guys make their own pumps and big ones at that.

Does anyone know where instructions are available ?

Tried googling but know luck

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tweekster
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Postby tweekster » Mon Jun 20, 2005 7:07 am

why would you wanna make your own pump? they cheaper than dirt.

kik128
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Postby kik128 » Mon Jun 20, 2005 7:34 am

Hey.
Because I can and have the time

and there's no wind

and because I can't be F'd with the shitty 1.5 litre pumps they send with the kites.

and beacuse I want to make a pump like this mother

http://www.nrsweb.com/shop/product.asp? ... eptid=1113

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lesbian horse
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Postby lesbian horse » Mon Jun 20, 2005 8:03 am

I don't think they will do high psi. Rafts only need like 1-2psi.

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spork
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Postby spork » Mon Jun 20, 2005 8:42 am

lesbian horse wrote:I don't think they will do high psi. Rafts only need like 1-2psi.
Yeah, there was a guy marketing that type of pump out at 3rd Ave last year. It will pump up a kite just fine. Looked like it would be relatively easy to make. Mostly PVC. I'd use aluminum tube for the shaft. I vaguely recall that it only pumps on the down stroke (which is my preference anyway). The secret is to make the plunger portion out of plastic. Then you have a thin piece of semi-rigid foam (similar to ethafoam) beneath the plunger. The foam fits more firmly to the side walls of the pump. On the down-stroke it pushes itself firmly against the plunger (forcing the air out the hose). On the up-stroke it flexes away from the plunger exposing vent holes in the plunger.

You'll also need to make a flapper valve at the hose junction. I can post pictures of how I did one if necessary.

Having said all that, I prefer the BST-12 electric. Haven't had my hands on a manual pump since.

RC


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