Paul,
   I'm at the point of doing my prop shaft and have decided to do it in a
   two piece, joined as in the Mazda flywheel i.e. taper with key. I have
   found a chap who has done a number of flywheels for the Rotary and he's
   doing the single crank. He has all the details of the taper and keyway,
   so I will utilize that data.
   I was wondering what the thickness of Tracy's flange and shaft. I don't
   intend copying Tracy's design just looking for a guide to strength. I
   figure the 43mm ( as in the crank) will be more than enough.
   George (down under)

   It is all a function of prop weight. A taper type design is not as
   strong as
   a forging. Tracy's forging is around 1.375 as I recall. So 1.693"
   should be strong
   enough for wood props. A Lycoming that must deal with 50 pound metal
   constant speed props is about 2.25 to 2.375 " in diameter.

   Here are some other designs that are out there but not very
   successful in terms
   of sales.

   Paul Lamar ...No rotor no motor.


Gentlemen! The statement regards to sales may be somewhat
correct,however that does not mean, its not fit to be sold now! Those
pictures are to be renewed as are the new and tested redrives of the
today.We have been running this unit extensively on one of our clients
"Fastglass" machines,just to prove, that we are here to stay.Pretty
pictures and empty promises just won't cut it, not here anyway!   Cheers
John Vlake.  G.A.P. industries

John, do you have an updated dwg on the prop shaft?
What is the current price?
What ratios are available?