Old as Dirt!
Join Date: Nov 2008
Location: Tampa Bay Area
Thanked 184 Times in 174 Posts
Rep Power: 11
Re: Beneteau First 42 Manual
In our case, I did not go with the Gori 3-blade quoted to us as mentioned earlier but elected to have our original 2-blade prop reconditioned. That is a 10x20 Gori folding prop. With that, at 2500 RPM we run at about 6.5-6.7 knots in flat water. At 3000 RPM we run at about 7.8-8.0 knots. (The foregoing with a clean bottom and, again, in flat water.) WOT on our boat is around 3600-3800 but I don't go there! As a practical matter, I don't like running for extended periods much beyond 2500-2700 RPM which gives us adequate speed (from our prospective) and keeps the engine temp at about 180º F.
Note that, because of the shallow pitch of the blades, our prop is very sensitive to any debris/growth on the blades and I can always tell when it needs a polish as our speed drops off and the boat become less responsive to throttle settings.
"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."