Paul, I received 2 copies of Contact! #89 from Mr. Morgan. Just wondering if
you received anything, I can mail you a copy, and or scan some pages.



C. Smith

 Not yet. I'll check the mail tomorrow.

I got the article and the Installation Handbook from Mr. Morgan. Thank you
Mr.  Morgan.  Very interesting idea.  They used my annular clutch throw out
slave cylinder invention invented in 1971 now widely used on most auto
transmission cars to change the pitch of the blades.  There is a serious
error in the dwg of the device that will confuse most people.  I'll have to
redraw it to clarify but it has to do with the allowable travel of the
annular slave cylinder.  Here is a modified sketch.

They use a PWM electric motor to provide the oil pressure to change the prop
blade pitch.  It is not necessary to do this with a leak free system.  You
could mount a long travel, small diameter cylinder behind the instrument
panel and change the pitch merely by pushing in the piston rod with a knob
on it.  It would look just like the pitch control on a C182.  There is a
European designed variable pitch prop that does it this way.  Super simple.
Just like a clutch master cylinder in a car.  That would save a lot of
money.  However you would not have the automatically controlled constant
speed feature.  That requires the PWM electric motor or a conventional prop
govenor.


Paul Lamar

Paul:

Am I to assume that this mechanism bolts to the engine prop flange?  If so,
how far does it extend the prop forward of the prop flange?

Tom Parkes

My guess is 4 to 5 inches from the flange face to the center of the blades.

Paul Lamar