Paul,

    Perhaps Lynn can answer this one easily.  I am wondering if the
    transmission spline size and shaft was enlarged when Mazda went from a
    13B to  the 20B.   Do racers use over sized shafts and splines to handle
    the larger amounts of torque and power.

    Doug in Japan

    Those pro road racers using 3 rotors are using $50,000 Emco
    transmissions. http://www.emco-gears.com/GT46.html
    That is the least of their worries :)

    Most of the airplane people are using the same input shaft Tracy is
    using on the
    two rotor. I think it is from a Ford V8 or some such. It mates up
    with a clutch
    disk center. I don't know what Mazda did on the 3 rotor Cosmo. Your
    buddy should be able to answer that question.

    Paul Lamar


I used the Tilton sport discs for a Volvo in my Mazda input shaft Saenz
transmission. And Chevy 15/16 fine spline on the richmond gear
transmission. The rotary, even the three rotor, have dismal torque and
there is little problem with shaft size. Drag racing with a heavy
flywheel would need a deeper evaluation. Nice pictures.

Lynn E. Hanover


Thanks Lynn.

BTW Tilton is my old Lamar Engineering company with a name change.
I sold it too cheap around the early 70's and retired for awhile
on my sail boat :)

Paul Lamar

Lynn,

Thanks.   Interesting you mentioned "Drag racing with a heavy flywheel
would need a deeper evaluation."  This is exactly my concern because I
will have a 55 lb prop that essentially has a direct load path to the
spline with only the planetary gears and prop to absorb any sudden
gyroscopic loadings.

Resonance engine induced torque is handled by a dampener between the
engine and the spline female coupling.
Paul the spline I have now from the early 13B appears to be 19mm  OD or
3/4"    Do  you have an idea what dia. the spline is in the picture of
Tracy`s Ford unit?


Cheers

Doug in Japan


Are you lucky. I just happened to have one here in the office.
One inch OD.

Paul Lamar