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Calculating Power for Displacement Boats | Boat Design Net Mat-C Senior Member It seems that whilst there are plenty of ways of calculating the power required for planing hulls, there's not so many for displacement craft I have seen Gerr's Displacement Speed Formula, from his "Propellor Handbook"
Gerrs Roll Period Recommendation - Boat Design Net Gerr includes a version of the "captain's formula" in his earlier article on p 9, though he doesn's use that name t=0 44*B (ft) GM (ft)^0 5 It is interesting that Gerr's formula has a fixed coefficient He says it "will provide a close estimate of roll time for any vessel of normal form" That brings up the question of what's meant by "normal
Power predition formula - Boat Design Net Gerr formula 1 and Keith's formula were less accurate and Kieth's formula gave the lowest answers for required power Don't know what coefficients he used but while they are all good useful formula get the coefficient wrong and you might as well just guess let me explain
Hull displacement calculation - Boat Design Net The simplification of using a block coeffcient (Cb) of 0 4 is just to try to get a rough idea of the displacement of an average sailing boat, knowing its Lwl, Bwl and Td, not to generalize This coefficient is hardly used when designing a sailing boat, but rather the prismatic one And yes, you're right about the flat fat idea I strongly recommend you the reading of Dave Gerr's book "The
Roll period - Boat Design Net I have read Dave Gerr's Masthead publications and used the formulas therein to calculate the roll period for the Diesel Duck 38 Roll period was 4 61
Handy Engine Sizing Formula - Boat Design Net I'm reading Dave Gerr's Propeller Handbook and playing around with the formulas When I combined the formula to estimate the maximum theoretical hull
Displacement Hull Speed calculation - Boat Design Net Gerr realised that displacement also affects the top displacement speed But hull shape also influences the speed, can anyone come up with a 'rule of thumb' formula which accounts for hull fineness as well?