X-Mozilla-Keys:                                                                                 
Charlie Kuss wrote:

Paul Yaw wrote:

My experience has been that these gears only break as the result of
ricky racer trying like hell to get rubber on the upshifts.  With the
stock flywheel weighing 25 to 30 lbs you can dump a lot of force into
the box when you upshift.

snipped

 I don't know if this means
anything when considering a prop, but I wanted to let you know that most

tranny problems are due to overexuberance, or solid motor and tranny
mounts. (Solid mounts and gear banging always seem to go together for
some reason.)  They even last fairly well at the drag strip IF you run
slicks which absorb a lot of the shock loads during upshifts.

PY

Charlie Kuss wrote:

 Although your automotive stick shift flywheel weighs around
22-30 pounds, it's diameter (and therefore it's moment) is very small compared to
the 6 feet + diameter of an aircraft propeller. Propellers can generate much
greater forces for the gearbox cum PSRU to deal with. This is why comparing auto
use with aviation use is an apples to oranges comparison.
Charlie Kuss
RV-8 wings

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