Wrathall Mark wrote:

Paulwrote:

I think you are missing something Chrissi. These brushes are going to get
wear that
is 1/1000 of the wear of say a Hoffman or MT electric prop brushes. In some
cases
they are only engaged for seconds on any given flight. Take off and climb at
low pitch. Increase the pitch for cruise. Decrease the pitch for landing
and you are done using the brushes.

Paul Lamar

Mark wrote:
How long do you think before people get seduced by the idea of a constant
speeding prop, and build a cheap electronic governer to drive pitch changes
into this system? If you programmed enough hysteresis into the controller ,
the solenoid system should be fine, but if the prop tries to hold perfect
set rpm, it wouldn't last long.
Mark Wrathall

I don't know Mark but if they insist they will have to put up with the same
brush life as a Hoffman or MT electric prop.

Paul Lamar

Why build? Just whip out your trusty JC Whitney catalog &
order one of their automotive cruise controls that have an
electric servo for throttle control. Hook the servo to  your
prop controller. :-)

Charlie England

 
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