I have decided to change out my Two Blade to a Three. I was advised by some on the forum to go with a RH 13/10 1" Shaft prop. When I contacted Cambell as was also suggested they recommended a RH 13 X 8 X 1. The difference is in the pitch. Is there a right answer? It is an 89 Cat 30 TRBS, Wing with the standard Universal M25XP. I need to get an order into the system ASAP or will miss out this season as I splash in the next week or so.