I want to get top end speed faster and know zip about props. I have a fiberglass 1988 Four Winn's 18' horizon, open bow with a 4.3L cobra engine and a aluminum 3 blade 15x17 Michigan prop. ( I don't know what 15x17 means) I've had the boat for 10 years, no engine problems and very clean. Usually it's me and my son or wife and daughter too, total about 600 pounds of people. It seems to max out at about 4200 rpm's with a max speed of 32 - 33 mph using a GPS. It will run up to 4800 rpm's, 4600+ is the red zone; but no more speed. rides best with kids about 250 lbs in the bow. It is stern heavy with that 4.3L. With me alone 260 pounds seems like I can get 35 mph on flat, calm evening water. I was thinking I should be able to get at least 45 mph; Mostly run on NY finger lakes or lake Ontario. I read through the cobra engine/prop on this site, but no insights for me.
Thanks,
Mike
Thanks,
Mike