Lenz2 Water pump

[windstuffnow]

  Glenn Littleford put together a Lenz2 originally sporting an F&P alternator but the noise from cogging was pretty bad he said.   He ended up turning it into a water pump... pretty nice unit !

http://www.thebackshed.com/Windmill/FORUM1/forum_posts.asp?TID=69&PN=1&TPN=1

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[electrondady1]

congratulations ed your machines a workhorse too!

[nothing to lose]

Nice looking water pumper there.

You may be onto something here with the Lenz2.

[hvirtane]

Looks really nice.

Do you know the dimensions?

- Hannu

[ghurd]

I notice Glenn's doesn't have end caps on the blades, and yours do. Seems it would help the drag part, if not the lift part.

Is there much difference one way or the other?

G-

[windstuffnow]

  Hi Ghurd,

    Actually yes there is a difference, a big difference as a matter of fact.   I've also added winglets to both ends of each wing.   This acomplishes 2 things.... 1 - it keeps the air flowing around the wing on the up wind side and 2 - reduces drag created by turbulance.  A simple change picked up a few watts which comes out to about a 15% increase in output.  

    The closed ends help capture the air on the downwind side, without them its like filling a trough with no sides with water.   On the downwind side we want as much drag as possible, the upwind side we want as much lift as possible ( one side pushing hard the other pulling hard ).  

     Everything you see out there is either designed as primarily a "lift" machine or a "drag" machine, The Lenz turbine is a hybrid lift/drag machine.  Both sides are harvesting power from the wind.

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