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.

Paul,
Can't agree with you more Matey, that shaft is way too thin IMUHO.
That's an understood on the forging but I have given up on trying to find
something suitable and forging something without proper tooling is
problematic, due to the width of the flange and that of the shaft.

BTW what is the thickness of the flange 3/8"?  or 1/2" tapered at the edges.
Thanks for the other drawings, there are a couple there I hadn't seen
before.
George( down under)

My guess on the flanges is they are closer to 3/8th rather than 1/2.

Paul Lamar ...No rotor no motor.

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