Wouldn't this statement  "V-ribbed belts are not recommended for
clutching drives."
keep you from using them.
Blake

I think they are speaking of the way Robinson uses
the belt idler to disengage the final drive gear box from
the engine. Robinson uses true multi V belts that are
matched in length to transmit the power. Those predated
the more modern V-Ribbed belts. We have one way clutchs
in the turbine gear box that take up the drive in a more
gradual manner. They lock up when there is as little as
one RPM higher in the turbine gear box output shaft as compared
to the E-shaft RPM.

Paul Lamar ...No rotor no motor.

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