2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 35Get this manual
Technical tips Propeller selection Propeller selection The performance of boat and outboard motor will be critically affected by the size and type of propeller you choosePropellers greatly affect boat speed, acceleration, engine life, fuel economy, and even boating and steering capabilitiesAn incorrect choice could adversely affect performance and could also seriously damage the motorUse the following information as guide for selecting propeller that meets the operating conditions of the boat and the outboard motor
Selection
When the engine speed is at the full throttle operating range (5,000-6,000 rmin) an ideal propeller for the boat is one that provides maximum performance in relation to boat speed and fuel consumptionF50F50A Propeller size (in) 10x15-G