What do you figure the weight difference to be between what you used of
the 12A and the same parts in the 13B?

How smooth was it?

I am very much interested in getting a rotary on my ultralight.  I would
be happy with 60HP in that same weight range.

Keith

A 13B base would add appr. 15 lb.

The only time I am seeing torsional vibration is below appr. 1500RPM

Richard Sohn
N2071U

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