Propeller, Replacement, Propeller Dia. (In.) 42 in, Bore Dia. (In.) 1 3/16 in, Number of Blades 4, Pitch (Deg.) 30 Degrees , Blade Material Spark Cast Aluminum, Keyway (In.) 1/4, Number of Set Screws 1, Rotation CW Facing Discharge, Required Motor HP 57-1/210, Required HP @ Higher RPM 10 hp, Required HP @ Lower RPM 5 hp, RPM Low 1,100 RPM, RPM High 1,370 RPM, Max. RPM 1100/1250/1370, CFM @ 0.000-In. SP 30,000/34,140/37,420, CFM @ 0.125-In. SP -, CFM @ 0.250-In. SP -