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2.5.1.2. A Measure of Merit for the Vessel Some designers try to translate the purpose or mission of the vessel into an objective, mathematical equation. This measure of merit is a specific formula that converts the complete design into one number, which tells the designer if boat design "A" is better than boat design "B" and helps designer select between major design trade- offs. Measures of merit are possible for all craft, not just for commercial designs where the goal is to maximize profit. For yachts, a specific measure of merit is possible for competitive craft, such as the America's Cup class. Their measure of merit is to win 4 out of 7 match races. This can be converted into a formula, based on the dimensions of the boat and constrained by the class rules, which will predict the elapsed time of a design over the racecourse for a variety of expected wind speeds. For non-competitive yachts, it is possible to define weighting factors for the major design requirements and assign ratings to each one to determine an overall, single number rating for the boat. Although the weighted rating technique is a subjective approach to design evaluation, it can help the designer and the owner better understand different design alternatives. For boats that cannot be evaluated by a mathematical equation, designer need to determine a set of important design attributes, their weightings, and their ratings. This is done as follows: 1. Determine a list of major design attributes such as cruising speed, range, ease of operation, cost, comfort, etc. 2. Determine a weighting number for the attribute, which relates the relative importance of that attribute compared to other attributes. 3. For each concept design alternative, assign each attribute one of the following ratings: Excellent, Very Good, Good, Satisfactory, Poor, Unacceptable 4. Apply a percentage value to each rating, for example: Excellent 100%, Very Good 75%, Good 62.5%, Satisfactory 50%, Poor 25%, Unacceptable 0% 5. Multiply the rating percent times the weighting factor for each attribute and sum the result. 17PDF Image | FIBER REINFORCED PLASTIC BOAT IN SERIAL PRODUCTION
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