Bill Freeman wrote:

Paul,

I think the Aeromatic automatic prop also is AD free after
50-60 yrs of service.  Don't know how they attach their
phenolic (I think) blades, but it must work. Worth looking at.

The Aeromatic prop for those not familiar with it was an automatic
prop in the sense it changed pitch according to RPM or speed as I
recall.
Avia in the Czech Republic also builds an automatic self contained
prop.

I agonised over that for a few years and decided it was best to
have a cockpit control for pitch. I have a simple design that is 
controlled by dynamic pressure which I am pretty sure will work. 
Instead I fell back on the standard  electric pitch change mechanism
because there are situations where you don't want the pitch
tied to speed or RPM.

Paul Lamar
 
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