chkm8
Cadet
- Joined
- Jun 21, 2008
- Messages
- 28
I have a Finnsport 650 which is 21ft weighs 2.8tonne and has a Mercury 115 2stroke outboard and semi displacment hull. I was told on buying the boat it had a top speed of 35knots. The most I can get from it is 23knots and while not concerned with reaching 35knots I find that at 23knts it is at 6000 revs and you would need a petrol tanker behind you. I am happy to cruise at 15 knts but even then the revs are at 4500.
Anyone I have spoken too tells me I should be able to get the boat up on the plane then throttle back to about 4000 revs and continue to cruise at 15 - 20 knots which will be more fuel efficient. I can get the boat up to 23knots and just about on the plane but if I throttle back at all the boat comes down of the plane again.
Can anyone advise me regarding the most efficient prop which will allow me to maintain my current speeds ie: 15 - 23 knots without having to be at top revs and filling the boat with spare jerry cans.
Anyone I have spoken too tells me I should be able to get the boat up on the plane then throttle back to about 4000 revs and continue to cruise at 15 - 20 knots which will be more fuel efficient. I can get the boat up to 23knots and just about on the plane but if I throttle back at all the boat comes down of the plane again.
Can anyone advise me regarding the most efficient prop which will allow me to maintain my current speeds ie: 15 - 23 knots without having to be at top revs and filling the boat with spare jerry cans.
