The heave and surge forces on a planing boat model was measured in a towing tank. Can resolution of these forces with respect to the direction of motion of the model yield the resultant lift and drag forces on the ship? If yes, is this resultant drag force also accounts for thr frictional resistance (including spray drag) on the boat?
Measured heave force in your case is lift force and measured surge force is the drag force. The measured drag force from the load cell basically constitutes the frictional force due to added mass and hull resistance force.
Provide a schematic of the experimental setup so I can provide you with further information. Also, provide details of calibration of load cell and design of load cell in terms of strain gauges location for more clear idea to readers who want to answer
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