Hi I purchased a new 21 ft Lowe pontoon with a 90 hrs. 4 stroke comand thrust mercury . It cam with a 4 blade 14 pitch prop. My to speed was 16 mile an hour at 6000 rpm. I talked with dealer he wanted to bring the rpm down and speed up so he got me a 3 blade 15.5 inch 17 pitch prop it brought...
