Paul Carey wrote:

Hi Paul

Received my billet eccentric shaft from New Zealand, and the part looks
good. You will see the rotor bearing flanks are smaller in that the 10mm of
metal adjacent is missing - like the 12A shafts I believe. This was done to
lighten the shaft for racing.

The thing that has bothered me, is that the engineer that made it stated
that the shaft needed balancing. Talking to some experienced rotary guys
here, they say that only the factory can really conduct proper balancing,
and not many people attempt it, and the veracity of their claims cannot be
verified. Any thoughts on this Paul? The fact that the shaft is lighter - is
that a concern? I believe the rotors and counterweights have to be balanced
somehow all together.

Regards Paul

Paul Carey
Aero Group Pty Ltd
226 Railway Parade, Bayswater WA 6050
P.O.Box 119, Maylands WA 6930
Ph: (08) 9371 5205  Fax: (08) 9371 9644  Mob: 0418 959 892
www.aeromanagement.com.au <http://www.aeromanagement.com.au/>

Looks like the accessory end driving the supercharger is much stronger with
that spline. Do you have some sort of diaphragm between blower and engine
that can fail in the event of a back fire? 

Yes if the shaft is lighter the balance weights need to be adjusted.
It is not that hard if you know the math.

Paul
 
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