My RCGF 32 run the 20,5x10 between 7000 to 7100 rpm. to compare this result with the 175CDi I ask to Christophe (CPLR) if he had measure this propeller he said me 7050 rpm. so what is interesting in this result is that it is obtained with basic fuel for the RCGF and with ultra rich nitro fuel for the YS .... the OS 33 gt is in the same case than the RCGF.