Good morning Paul

 I am sending you a sketch the way i am looking the
reduction angle drive with all components ,check it and come back on
 your own view


 Jean Prudhomme

 Nice sketch Jean.

 I took the liberty of modifying it the way I think it should be done.

 IMHO using u-joints on the prop shaft adds unnecessary weight and
 torsional flexibility.

 It is up to you of course.

 Paul Lamar

Jean Prudhomme wrote:
 Paul what are you doing for the reverse trust when engine is lost and
prop dragging on the air stream crating a reverse trust on propshaft??

 How are you attaching the prop flange to the main carbon fiber tubing??

 Jean Prudhomme

The carbon fiber prop flange would be bonded to the carbon prop shaft.

About the only practical thing to do is find an electrically adjustable prop that
will feather.  I don't think you are going to come up with a workable hydraulic
constant speed featherable prop system with this arrangement of angle drives
and carbon fiber shafts.

If you make everything out of steel to tolerate the oil 200F temperature it will be a
huge weight penalty. As a I said before put two engines on the wings and talk
Mistral into selling you a couple of constant speed gear boxes and forget it :)

Perhaps Jeff Doddridge can build us a planetary constant speed prop gear box
like these 3D's.

Paul Lamar