What is the ideal prop size for a Mercury classic 50 outboard?

depends on length/width/hull ype/and total normal weight load but heres and example 75 16 ft. sangstercraft /deep v hull weighing about 1800 pounds total incl. motor gear etc. i use a 12pitch prop it does 46 k/hr at mid trim and 51 k/hr at max trim ( roughly 22-26mph) if you are heavier or longer you will want an 11 or even a 10 pitch . best advice though is have tachometer installed so you can verify you are turning max rpm's at w.o.t . a motor running at its full potential will be healthier than one running outside that range usually 5000 - 5500 rpm

depends on length/width/hull ype/and total normal weight load but heres and example 75 16 ft. sangstercraft /deep v hull weighing about 1800 pounds total incl. motor gear etc. i use a 12pitch prop it does 46 k/hr at mid trim and 51 k/hr at max trim ( roughly 22-26mph) if you are heavier or longer you will want an 11 or even a 10 pitch . best advice though is have tachometer installed so you can verify you are turning max rpm's at w.o.t . a motor running at its full potential will be healthier than one running outside that range usually 5000 - 5500 rpm