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2.4.1. Process of Design Spiral The design spiral process starts with a large number of design requirements which includes items such as: •Maximum Payload Weight •Required Payload Volume •Range at Cruise Speed •Cruise Speed •Speed/Time Operating Profile •Design Margins and Standards. After determination of design requirements, the spiral progress starts and the main dimensions of a particular design are set as step 1. At Step 2, the user specified dimensional information from Step 1 is combined with other user specified hull form characteristics to establish an initial estimate of the hull form. This hull form includes a simplified 3-D wireframe of the entire boat’s hull from baseline up to the main deck level. In order to do this, it is necessary to make an estimate of the full-load displacement on the first iteration around the design spiral. Subsequent iterations around the design spiral will use the calculated full-load displacement from the previous iteration for hull form development. The wireframe defines the geometry of the hull in sufficient detail such that a table of offsets is generated from which faired lines can be readily developed. Some of the primary output from this step includes: 1. The number of decks in the boat hull and total volume available in the boat’s hull and 2. Total area available on each deck. At Step 3, the resistance and seakeeping of the hullform which was established in Step 2, are calculated. At Step 4, the entire propulsion system is designed. This includes the design of the propulsion(s), the power transmission, the propulsion prime mover(s) and associated systems. The propulsion system can be either a mechanical drive or electric drive system. The propulsion machinery is sized to match the most demanding speed/sea state case from Step 3. 13PDF Image | FIBER REINFORCED PLASTIC BOAT IN SERIAL PRODUCTION
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