Wednesday, March 28, 2012

Re: [Electric Boats] Re: Regen (again)

 

Tim
The pressure is on the opposite side of a blade if its being driven or doing the driving, or to put it another way, the blades are rotated about 180 degrees in their radial axis for the different functions. That is one of the major reasons why regen is generally a waste of time
rgds
Alan
----- Original Message -----
From: Tim
Sent: Wednesday, March 28, 2012 8:01 PM
Subject: [Electric Boats] Re: Regen (again)

 

Eric,

I do know that you have said that no one is making more than a 100watts with regen, and I believe you. I also know that people are making a lot more than 100watts with screw impellers in streams. What I don't know is why it matters whether the water flows or the water stands still and the impeller moves. I suspect blade stall has something to do with it. An autoprop would reduce or eliminate blade stall.

I don't think an autoprop will increase performance at the optimal cruise speed. After all, it will be at one pitch at that point and shouldn't perform any better than a properly pitched fixed prop. I do think it should widen the envelope of performance so that you get better performance over a wider range of speeds. I think it will couple the drive line to the water more efficiently in varying situations.

Mostly I think it might provide interesting data.

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