This is my old design shown on the ACRE NL web page.
I had an idea for reducing the cost. The blade ball bearings shown are
Torlon which are very expensive. I chose Torlon as they could run directly
in the anodized aluminum housing without hardened ball races.
 
The threaded portions are designed to be screwed into cheap steel 
conduit couplings that are bonded to carbon fiber blades. 
See the ACRE NL web site for more details.

Moving the electric motor behind the prop
hub will save some cost. If you have a hollow PSRU prop shaft even more
space, weight and cost can be saved by putting the motor in the
hollow PSRU prop shaft. 

I will redesign this for a welded steel tube housing, the above changes
and cheaper steel ball bearings.


Paul Lamar
 
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