Ira
Bob's right. Resonance is the issue. MT propellers will know the answer,
they usually do a vibration analysis and they are careful experienced
people.
You need to think where the pulses from the power strokes come, then
compare that with the pulses from the airflow. Those will be caused by
the pitch angle of the thrust line plus any
R.C.Harrison wrote:
> Hi! Ira
>
> There is possibility of conflicting resonance between the position of
> the blades and the power strokes of the engine which can be
> considerably reduced with the rotational alignment specifically
> arranged in relation to the power strokes. A three blade prop requires
> a different alignment to a two blade prop and I believe that a four
> cylinder engine compared to a six cylinder needs a different
> consideration too. Sorry I cant help further but Ive trawled through
> all my files to no avail. I know I once referenced the problem with MT
> Propellers and they made a definitive reply
>
> Bob Harrison
>
> Robt.C.Harrison
>
>*
>*
>
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