Right prop for a Merc 87' Classic 50

[FishinInMizzou]

As you know a classic 50 is actually a 45 hp. The current prop has 13x9 on it - it runs out at 5200 rpm's and 18 mph. I think that is probably right for a 20' Suntracker. The current prop is pretty beat up. Is the prop I need to replace it with the one at this link?

http://boatpropellers.iboats.com/Me...16942/?**********=939309554&*******=335340463

Thanks, Ken

 

[steelespike]

Re: Right prop for a Merc 87' Classic 50

First number is the diameter.
13" in your case. Pitch is 9" which does seem about right.
You need a 9" pitch.Don't worry about diameter.Diameter simply follows function.
You might consider a 4 blade prop And reduce the pitch by 1 inch.
The 4 blade will be less likely to vent(cavitate) and will work better in reverse.