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