fryedaze
Guru
- Joined
- Sep 4, 2011
- Messages
- 1,722
- Location
- USA
- Vessel Name
- Fryedaze
- Vessel Make
- MC 42 (Overseas Co) Monk 42
Idle (one-third WOT) for me equals 3 knots. Normal cruise (one knot less than hull speed) three-fourths WOT. Maximum (hull) speed a 92% WOT. See no need for overpropping here. Especially don't want a higher minimum speed.
With my 26X26 I did 3.8 ktns at idle. The 25X27 now does 4.2 at Idle. At 1550 RPM the 26X26 di 7.5 knots. The 25X27 does 8 Knots. I am now over propped and can not reach my 2650 design WOT for the 6BT 5.9 Cummins. WOT is 2590. I am pretty sure I am ok. BUT, I don't believe I gain anything based on the laws of physics. It still cost the same to move the 30,000 lbs of boat through the water.