Guy Fawkes wrote:

You MUST KNOW THE YIELD STRESS of your flywheel material, that word is
KNOW, as in FOR A FACT, as in you have absolute knowledge of the
precise composition of the material it is made from.

Somehow, you are right. But it suvived the 100 RPM on the lathe er ...
mill _with_ cutting forces. So it will not crack at 200 RPM on the
engine (that will be a _sloooow_ running 4 stroke).

BTW, it was a very nice machining CI.


Nick
--
Motor Modelle // Engine Models
http://www.motor-manufaktur.de
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