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Re: foot pumps
By:Paul MacIntyre
Date: 3/15/1999, 10:17 pm
In Response To: Re: foot pumps (Pete Rudie)

> Great post, Jack. The only addition I have is about the spring question,
> which is moot if you don't use the Chimp, but may apply to others as well.
> The return spring fills the pumping chamber after you empty it with your
> foot, so the force it needs to overcome is the sum of the internal
> friction of the pump and the weight of the water column in the pickup
> tube. Internal friction is pretty small, so the major factor is the head
> pressure in the water column.

Most of these pumps have a one way outlet valve, so I believe the head pressure is only a factor in the expelling stroke not the filling stroke.

Messages In This Thread

foot pumps
Paul MacIntyre -- 3/12/1999, 11:23 pm
Re: foot pumps
Paul MacIntyre -- 3/15/1999, 7:24 am
Foot pumps: another small idea
Pete Roszyk -- 3/16/1999, 9:10 am
Re: Foot pumps: another small idea
Paul MacIntyre -- 3/17/1999, 12:15 am
another idea
Jon Murray -- 3/16/1999, 10:15 am
Re: another idea
Jack Martin -- 3/16/1999, 7:43 pm
Re: foot pumps
Jack Martin -- 3/15/1999, 6:25 am
Guzzler info
Mark Bodnar -- 3/18/1999, 9:05 pm
Re: Guzzler info
Jack Martin -- 3/19/1999, 6:57 am
Bracket for hand pump??
Mark Bodnar -- 3/19/1999, 7:37 am
Re: Guzzler info
Pete Rudie -- 3/19/1999, 12:02 am
Re: foot pumps
Ed Kuczmarski -- 3/17/1999, 3:46 pm
Re: foot pumps
Pete Rudie -- 3/15/1999, 12:31 pm
Re: foot pumps
Paul MacIntyre -- 3/15/1999, 10:17 pm
Re: foot pumps
Mike Allen -- 3/14/1999, 1:38 pm
Re: foot pumps
Scotty -- 3/14/1999, 3:46 pm
Re: foot pumps
Mike Allen -- 3/14/1999, 6:41 pm
Re: foot pumps
Ross Leidy -- 3/13/1999, 11:14 pm
Bulkhead-mountable footpumps
Pete Roszyk -- 3/13/1999, 10:26 am
Re: Bulkhead-mountable footpumps
Pete Rudie -- 3/13/1999, 4:19 pm
Re: foot pumps
Pete Rudie -- 3/13/1999, 12:43 am