The Belts on the R22 and R44 look very similar to those that drive the main threshing drum on the Massey Harris Combine's, if they are they should be very good. The Rotorway does look quite a neat little eggbeater, BUT I have resevations as to how I have been told( by the importer)how they balance the Rotor blade's, somehow it seems a tad wrong, I would not like to be the one to find out IT WAS WRONG, but if its built right ,in theory it should fly right, or......