N_Cook wrote:



Supposition is that the difference in flywheel dia is related to belt
thickness, as one flywheel is inside, and other is outside the drive
belt loop.

RL


That would be lead to a much closer pair of pulley diameters.


** The supposition is nonsense.

Where the drive belt is curved, the outside radius is greater - but both flywheels are on the INSIDE of curves.


..... Phil