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 oversized 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


Paul if you have that reduction gear can you turn it around so I can see
the other side? img 7998.jpg.

I have figured it out almost. Input shaft from engine splines to #3887,
#3887 turns #15, #15 turns #30. But the picture shows #15 to be splined
on the inside. Is 15 driving the prop or is something bolted to 30
driving the prop?

Dan


Part number 15 and there is a female spline in it. It is iron or steel in
the six pinion version. 15 is driving the prop but that is not the best
way of doing it. Cut down 15 and use something like this hollow shaft version.
The conventional output shaft with the large ball bearing is very heavy indeed.


Paul Lamar