Manly Q.
Veteran Member
Hi All.
I have seen many times on the forum a discussion about how to work out hull speed by using a formula but the formula does not seem to take account of the various forms a hull can take.
For instance a Sharpie hull, typical trawler hull form is squared off at the transom whereas a Carvel hull is similar to that of a sail boat, more rounded and smoother through the water and I suspect that it requires less power for more knots.
I may have missed some point in using the formula though and am happy for any of the learned boaties here to learn [sic] me.
Also the discussion about how much H P is needed to achieve hull speed appears to neglect the power drawn away from the engine by power systems on the boat which do not add anything to propulsion.
I hope I have kept the question simple enough so that the answers do not drift too far.
Thanks
David.
I have seen many times on the forum a discussion about how to work out hull speed by using a formula but the formula does not seem to take account of the various forms a hull can take.
For instance a Sharpie hull, typical trawler hull form is squared off at the transom whereas a Carvel hull is similar to that of a sail boat, more rounded and smoother through the water and I suspect that it requires less power for more knots.
I may have missed some point in using the formula though and am happy for any of the learned boaties here to learn [sic] me.
Also the discussion about how much H P is needed to achieve hull speed appears to neglect the power drawn away from the engine by power systems on the boat which do not add anything to propulsion.
I hope I have kept the question simple enough so that the answers do not drift too far.
Thanks
David.