 As the vessel exceeds a speed-length ratio of 1.34, the wavelength is now longer than the hull, and the stern is no longer supported by the wake, causing the stern to squat, and the bow to rise.The hull is now starting to climb its own bow wave, and resistance begins to increase at a very high rate.While it is possible to drive a displacement hull faster than a speed-length ratio of 1.34, it is prohibitively expensive to do so.