boat prop

[sammie white]

i have a 50 hp 4 stroke merc,it has a 13pitch 4 blade prop,it only turns 5300 rpm at 32 mph. i am looking for a better replacement prop,i am stumped on props to replace this one because merc says to turn close to 6000 rpm for most hp.this boat is a polar kraft 16 mv 2002 model motor is 2004.please help suggest prop before i buy the wrong thing

 

[steelespike]

Re: boat prop

What is your load?Do you know the dry weight of the boat?
Your 4 blade prop can cost a couple of mph and some rpm.
depending on the load its possible a 12" 3 blade Might get you to 5600 or 5700.
An 11" maybe 5900. I feel the 12" would give better speed than the 11.