X-Mozilla-Keys:                                                                                 
Perry,
The prop looks great Perry. It just looks like it has
too much pitch. I think with a new duct and a new prop
and with a smaller cowl you might be in the realm
of acceptable performance. Hang in there a while
longer. 

Perhaps you can use those blades and 
bond on a hub of some sort with carbon cloth
reinforcement to make a ground adjustable pitch
prop. A little more blade thickness down around the 
hub should not matter much.

I would do that before I would make a new duct
or change the intake system and cowl.

                        Blade  90-blade
Radius  Cord    Thick.  Angle   Angle

4.0     4.00    0.49    64.00   26.00
4.5     3.95    0.46    60.95   29.05
5.0     3.90    0.43    57.90   32.10
5.5     3.85    0.41    54.85   35.15

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org