Seafari 25 performance

[cdavisdb]

Mine are where Brandon's seem to be. They exit through the side of the boat. Much of the time the deck tilts slightly down going forward, so scuppers more forward sound like a good idea.

Brandon,thanks again for the tab idea. Those are even larger than what I had on the Seabird. Looks like there is enough surface area to damp the roll quite a lot. I'll find out.

Denny, that vacuum gauge is the cats meow. You have made a convert. Haven't fixed the props yet, but I think I know what I want. Same engine F5s(stainless) was 4600 rpm in the Seabird. These are D2s (aluminum) and turn 5050 loaded. The volvo book says 200-250 rpm for each size larger in duoprops and go one size larger for equivalent in stainless. That gives me a F4 which should give about 4800 loaded. Max rpm range 4600-5000 on this engine. I'll have several conversations with prop guys first, but thats what I think for now. Does being in the middle of the max rpm range with the boat loaded close to the max its likely to carry make the most sense?

One thing I don't understand, maybe someone can shed a light. The volvo book says most efficient cruise speed is 15-25 percent below max speed at max rpm. That results in real high rpm that the vacuum gauge says is too high and looks too high to me as well. Any comments?

Connor