Weight of boat? I found the merc/quicksilver prop calculators very accurate. My boat is 21ft, 220hp 5.0L. 3000lb plus gas/meat/gear. The calculator chose a 4 blade aluminum 19p, 14.5" diameter OR a 3 blade 18p aluminum 16" diameter. I opted for the 4 blade.
At a loaded weight of 3500lb, wot...