i was at a race with the team in patchog l,i, and bob took me in his toter and showed me a chart he developed with gear ratios and prop size everything was down to 50 rpm,s to mph to length of course, it was amazing to me. the chart was 4 foot long by 2 foot wide, i,d say yes he knows props. if you go after team AMSOIL you better do your homework and pray for luck!,,,:USA: