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  • From: "WILLIAM JONES" <billj AT harborside.com>
  • To: <homestead AT lists.ibiblio.org>
  • Cc:
  • Subject: [Homestead] Solar-Powered Buoyancy-Driven Heat Engine
  • Date: Sat, 16 Jun 2012 22:16:16 GMT

Don Bowen wrote:
> Those low speed devices are best for such things as pumping water. If
> you try to gear them up for higher output speed you run into significant
>gear losses due to the significantly increased load between drive elements.
Oh you bet.  Fortunately you can always match the required torque with the
available
torque, just by modifying the design of the screw.
> The screw (basically an inclined plane wrapped around a shaft) will move
> water but you have to take into account losses between the pipe and the
> edges of the screw.  The screw is used to pump water in India by human
> power.  A treadle is hooked to the upper end and turned by the feet of
> the pumpers.  Cheap and easy to use so losses become less important.
It's possible we're talking about apples and oranges.  Are you talking about
an
"open trough" screw?  The kind I'm familiar with has a spiral hose that can
develop
very high pressures.  But in this case, it produces a certain proportion of
compressed
air in addition to water.  If you just waste this compressed air, then the
losses are
extreme.
Anyway, I'm working on figuring out how best to mount the plastic bottles
around
the central hub.  They mustn't be punctured in any way, hot glue doesn't hold
them, and a
giant rubber band isn't very appealing.  Any suggestions would be GREATLY
appreciated.
Bill



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