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Hull speed can be calculated by the following formula: where is the length of the waterline in feet, and is the hull speed of the vessel in knots. If the length of waterline is given in metres and desired hull speed in knots, the coefficient is 2.43 kn·m −½.
In particular, any "displacement" or non-planing boat requires much greater power to accelerate beyond its hull speed, which is determined by the length of the waterline, and can be calculated using the formula: Vmax (in knots) = square root of LWL (in feet) x 1.34. The hull speed is the speed at which the wavelength of the bow wave stretches ...
design is the type of boat be it One-Design, a Development Class, or other (such as Box Rule) Example Box Rule: String: optional: class: class: class is not a commonly used option it may be worth here it is worth considering using the template sailboat specification rather than this one. Example Maxi 70 Class: String: optional: brand: brand
For the International rule, the rating number is approximately equal to the sailing length of the hull. These boats have long overhangs which allow the waterline length to increase as the boat heels over. A displacement hull's maximum speed (the hull speed) is directly proportional to the square root of its waterline length. [2]
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The boat came with an outboard motor provision as standard with the option of an inboard BMW, Volvo Penta or Westerbeke diesel engine powering a saildrive unit. The early versions had the BMW powerplant of 7 hp (5 kW), which some owners found underpowered and that led to the Westerbeke engine of 10 hp (7 kW) being substituted.
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The sail plan may provide the basis for calculating the center of effort on a sailing craft, necessary to compare with the center of resistance from the hull in the water or the wheels or runners on hard surfaces. Such a calculation involves the area of each sail and its geometric center, referenced from a specific point. [4]