propellers

i have a 21 ft pontoon with a merc 60 hp four stroke big ft engine i am only getting about 15 mph does this sound right the prop is a 14x10 red line on engine is 6000 wot will over rev the engine any suggetions on how to get more speed or correct prop size :brickwall:

This is kind of a neat idea... Piranha Propellers has signed up 30 dealers so far who have agreed to participate in a propeller recyling program. Authorized centers will collect damaged propellers that will be shipped to a center where they will be recycled. Article link below...