I could use some expert advice.
20 horsepower diesel engine turning *a 12 x 14 R/H 3 blade prop, engine runs no load full fuel at 3200 rpm @ 2750 rpm I can cruise at 6.0 knots max speed on a good day is 6.2 knots at 3100 rpm *full fuel. *If I change the prop to a 12x15 or 12x16 will this increase my top speed, I would like to cruise at 6.5 to 7.0 knots, I am not sure if this is possible with my 20 horsepower engine I believe my transmission ratio to be 2.4:1 but I could be wrong on that. *All advise will help. *thank you