Fred Osborn wrote:

Paul,

I?m a newbie and not sure this is the right address for this but the
posts on the LAEV prop have aroused my interest. I?m a retired aerospace
EE with 30+ years experience some of which involved use of various forms
of slip rings. Nasty things, prone to failure, cause of many headaches
and sleepless nights ;-). This is not to imply that the LAEV approach
lacks merit, make that considerable merit.

In the past I?ve given some thought to the problems involved in an
in-flight prop pitch adjustment and concluded that a electromagnetic
coupling would be the best approach. Something along the lines of a
pancake 2 phase or stepper motor generator with its rotor on the prop
shaft directly driving a 2 phase or stepper motor and gear train in the
hub. A switch would control the generator stator DC excitation (+ off -)
to determine the status and phase (direction) of the motor drive. It
seemed to me that this could resolve all of the wear and contamination
problems at a minimal weight penalty.

I don?t know if these thoughts are of any interest but I thought I would
toss them up for your consideration.

Fred Osborn

I would love to see a design for that. Can you get power to the motor
without contacts? I have no knowledge or experience in that area.
Can you do a schematic for us and upload it? Can we get the motor off the
shelf?

Paul Lamar
 
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