Evolution in Hull Forms
Everything comes from something that came before. Technological advance comes from finding new combinations of existing technologies.
To quote Brian Arthur from The Nature of Technology;
“If evolution in its fullest sense holds in technology, then all technologies, including novel ones, must descend in some way from the technologies that preceded them.”
It's hardly breaking news that the combination of a slim hull and a canoe stern makes for a very easily driven hull form.
Add some stability in the form of outriggers or a second hull, add some pitch damping technology in the form of asymmetric water planes and you have a highly effective means of voyaging at sea under motor with good fuel economy and a sea kindly motion.
Malcolm Tennant put all these technologies together in the 1980's to create a highly successful hull form that he labelled the CS (Canoe Stern) hull. The success of the CS hull form is firmly established and aside from being deployed Tennant's own designs it has been adopted by the builders and designers of displacement motor yachts around the world, especially for long range voyaging in open ocean waters.
We've taken the CS hull form one step further by maximising the length of the waterline in relation to the weight of the boat, with particlar emphasis on the bow. This allows us to use a fine bow for easy penetration of the waves while still providing adequate buoyancy forward to minimise the chance of nose diving.
In the quest for more accommodation in a given length of boat, seakeeping and efficiency (including low fuel consumption) have all too often be overlooked. A high centre of gravity promotes pitching and roll. Longer hulls dampen pitching and reduce resistance. A lower profile and longer hull provides us with a lower displacement to length ratio, a sign of an easily driven hull and greater fuel economy. Longer hulls are ideally combined with the a reverse bow which is ideally suited to motor yachts with CS hulls because it optimizes waterline length without significantly increasing weight or windage.
The combined Newsletter for Grainger Designs and Rocket Factory Trimarans
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