Sorry if my query was misconstrued, I'll try to clarify. I am sure I have read somewhere that, for displacement hulls, there is a limiting hull speed, dependent on hull shape and waterline length, that cannot be exceeded, irrespective of how much power is applied to drive the boat. I wondered if a figure is available applicable to the springer hull? I would use this information to try to derive an optimum motor / gearbox / propeller combination for the boat I have just started building.
Thanks John K.