As soon as ANY convexity is introduced to the aft bottom, it starts to move toward a semi planing hull. A hull with straight and parallel buttock lines, when powered adequately, is obviously a planing boat. The reason that there is no solid definition between semi displacement and planing hulls is that there are an unlimited number of variations between the two. So, they can afford to live with reduced efficiency of the rocker at planing speed to meet their other objectives.Īs far as hook on a semi planing boat bottom, I'd guess that someone made a mistake.Ĭlick to expand.True enough Will. They power these boats (as big as 65+ feet) with huge engines to get the necessary speed to do their daily job of getting paying sport fishermen out to fishing grounds, spend time there and get them back no matter the weather. It keeps the bow high to avoid submarining into big waves and also to keep that sharp bow from taking over the steering when it hits an off angle wave. So, I think the reason for the aft rocker is two fold. They have a sharp bow to ease entry into these waves which is understandable. These boats go out the the Gulf Stream in the inhospitable waters off the NC Capes and are expected to run through big waves going and coming at high speed. The builder just said 'that is the way the buyer wants it.' The boat was about 45' long and had a small but visible rocker in the bottom. I had that same issue when I first looked at the aft bottom of a Carolina offshore sportfisherman.

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