I thought the big work I was going to do was replace the prop shaft and cutlass bearing but I got sidetracked by electrical issues.
Further research into my power situation, I'm over propped. Max RPM should be 3200, cruising range 2100-2600. Last season full throttle all I could get was 2100 in gear, in neutral I could spin the engine up to 3200. The reputed prop for this boat is a 13x10. The prop on the boat is 13x12. Ive seen 2 inches down of pitch will add approx 500 RPM. I inherited with the boat a 15x8 prop. The 15 dia wont fit on the boat, but the pitch of 8 would put me at the right rpm if the 500/2in is correct.
Does it make any sense to modify the 15 in prop? Reduce the dia, trim an inch off each blade? Does this muck up the pitch? Or is the curvature and rotational progression not affected by the area away from the center of rotation, I'd thing not. I know the balance would be something. I'd have a pro do it.
Any thoughts?
Thanks,
John Rolka
Further research into my power situation, I'm over propped. Max RPM should be 3200, cruising range 2100-2600. Last season full throttle all I could get was 2100 in gear, in neutral I could spin the engine up to 3200. The reputed prop for this boat is a 13x10. The prop on the boat is 13x12. Ive seen 2 inches down of pitch will add approx 500 RPM. I inherited with the boat a 15x8 prop. The 15 dia wont fit on the boat, but the pitch of 8 would put me at the right rpm if the 500/2in is correct.
Does it make any sense to modify the 15 in prop? Reduce the dia, trim an inch off each blade? Does this muck up the pitch? Or is the curvature and rotational progression not affected by the area away from the center of rotation, I'd thing not. I know the balance would be something. I'd have a pro do it.
Any thoughts?
Thanks,
John Rolka