 Wave propagation speed, which means the same thing as the phase speed of deepwater wave, is independent of length of the hull causing the wave, but dependent of the speed of the hull instead.A simple way of considering wave-making resistance is to look at the hull in relation to bow and stern waves.If the length of a ship is half the length of the waves generated, the resulting wave will be very small due to cancellation, and if the length is the same as the wavelength, the wave will be large due to enhancement.