![]() ![]() The first fast fishing boat to hit the UK mass market was the cathedral hull. Cathedral hull Most folk want the speed from a fast planing hull, but speed can bring a whole range of potential problems with it, not least of which is knowing how and when to use it, but that’s another story. Semi-displacement hulls, created by flattening the rear half of the hull to give the front end lift and increase its pace, are quite popular in the world of fishing. Some innovative thinking has brought the displacement concept into the modern world. Too much weight and thrust will cause the bow to rise, reducing stability under power, making it more likely to turn over in rough weather. Putting a bigger engine on the back will not increase that speed, in fact it will make the boat less safe. ![]() The square root of a 16-foot displacement hull is four, which multiplied by 1.34 gives a top speed of 5.36 knots. The laws of physics, which says that the maximum achievable speed is 1.34 times the square root of the waterline length, govern performance of these hulls. When the maximum speed is reached, that's your lot. The main drawback of this hull is that it creates a lot of drag, which in turn limits the top speed of the boat. Displacement hull As the name suggests a displacement hull is designed to push through the water, as opposed to over it, displacing it (pushing it away) as it powers forward. You need enough beam on a boat to make fishing comfortable.
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