I've got an '86 Johnson 60 fiberglass fish/ski boat. Prop is 13 1/4 x 17" pitch. WOT is 35mph 5600 rpm. Can anyone give me a top speed guestimate and RPM on switching to 19" pitch?
Also. Rarely I've got 4 adults in the boat but it runs like a slug when I do. Will 19 pitch prop help or make it worse when fully loaded?