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Published 13.02.2014 | Author : admin | Category : Wooden Skiff Plans

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Most multihull design books include a section about the pros and cons of various hull cross sections.
When a boat moves through the water, the friction between the boat hull surface and the water flowing past it causes a drag force on the boat.
However, as the boat speed increases, the hull begins to cause a wave to form at the bow that propagates away from the boat but also forms a hump toward the front and a dip towards the rear of the boat hull itself. To minimize the second force, multihull designers have learned to design very slim hulls so that the amount of wave making is reduced to where the hump and dip are eliminated for all practical purposes. Of course, the hull or hulls of a sailboat must also resist the tendency of the wind on the sails to push the boat sideways. Another design choice, once a designer has decided how long, deep and slim he wants the hull to be, is how to shape the underwater portion of the hull to carry the weight of the boat and the payload he wants to put in it. If a designer considers several cross sections and makes them all have the same area (implies same displacement) as shown in figure 1 below, geometry tells us that the semi-circular one has the shortest perimeter. Another thing to observe from the shapes in the figure is that the waterline width (Bh) is different from one shape to another. Another thing to note is that very few hull designs retain the same shape from bow to stern. Bernd Koehler of K-Designs favors hard chines which he incorporates in symmetrical and asymmetrical trapezoid shapes with flat bottoms. To summarize, there are many factors that go into choosing a hull shape, and one must be careful not to attempt to oversimplify it.
The StingRay Classic was developed over 20 years ago from the most advanced computer engineering of its time.
The StingRay Classic hydrofoil surface creates lift to bring the stern up and the bow down.
Again, the StingRay Classic’s wings go to work.  The stabilizing action balances the boat to keep it upright and moving forward without a hassle.  StingRay works while you play!

If anyone has ever attempted a project similar to this your tips would be much appreciated, as would be advice on propeller and hull design. Location: Southern England The mouse-trap is basically just a torsional spring. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. They dont always agree with each other, and when that happens, it begs the question of why not. This drag force is the predominant resistance to boat movement through the water at low speeds. Edmond Bruce did model studies that showed that a waterline length to beam ratio of 8:1 or higher would accomplish this. Asymmetrical (notably Hobie and Rudy Choy) and deep vee (notably James Wharram) hull shapes, keels, dagger boards and centerboards are design approaches to do this.
If a designer wanted a more slender boat with the same displacement as the boat with the semi-circular shape to minimize wave drag, he would have to select a shape that was narrower but deeper, for example, an oval shape. Most are basically semi-circular at the mid section, more vee shaped toward the bow and flattened toward the stern.
He argues that the chines have hydrodynamic benefits that offset the additional wetted surface. This bolt-on hydrofoil has proved extremely reliable and has become the number one selling marine accessory of all-time!
Along with a faster hole shot, your boat will stay on plane while cruising at lower speeds. With the boat achieving a faster hole shot, skiers are pulled up quicker and experience a more stable ride. I would go for a high gear ratio (10 or greater (remember the mousetrap only moves through 180 degrees)) and then a nice big prop in the water. Since the drag force is proportional to the area of the wetted surface of the hull, designers seek to minimize this area.

If this wave is pronounced, the dip moves toward the rear as speed increases until it fails to support the stern. All others will have greater wetted surface related to the numbers shown on the figure below, which was taken from Derek Harveys Multihulls for Cruising and Racing. The elliptical and multi-chine shapes are good choices to get slimmer hulls that approximate semi-circular in skin surface area. With a StingRay Classic installed, boats get up on plane 50% faster, while bow rise is also reduced. Chinewalking, porpoising, and cavitation are no longer problems for boats with a StingRay Classic.
This will be achieved through gearing systems linked from an extended mousetrap arm to the propeller. This is called reaching hull speed and the force needed to make it go any faster increases significantly. During that time period, other multihull designers, notably in Great Britain, Europe and Australia, favored semi-circular hull shapes with dagger boards, centerboards or keels.
For boaters wanting true stabilization, performance enhancement, and increased fuel efficiency from their hydrofoil, a StingRay Classic Hydrofoil will satisfy and surpass expectations! The debate over which was best was documented primarily in the Amateur Yacht Research Society publications. Today, the semi-circular shape and some close approximations to it dominate the designs offered.

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