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Rethinking the fluidyne shallow well pump

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Posted by Morris Dovey on October 25, 2009, 8:53 am
This relates to my post of September 9 [Fluidyne well pump (5m)]. I was
after a really simple solar-powered shallow well pump, and was fairly
pleased with that design.

But I just couldn't leave it alone - and wanted to simplify it still
more. After a lot of lost sleep, I decided that it should be possible to
eliminate about 2/3 of the plumbing /and/ about 2/3 of the fluid and
have a more efficient engine/pump combination.

What seems particularly interesting is that the new single-piston design
might open the door for a completely dry (no fluid at all) engine
capable of driving a single 'hard' piston for use with a linear
alternator - an exciting prospect for me since the 'classic' fluidyne
isn't particularly well-suited for generation of electrical power.

If you're interested, I've posted a new web page at


with a drawing and rationale.

Feedback invited.

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

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