Offsets define the hull thru an x,y,z coordinate system. x is defined as your station points from the bow or stern along the dwl. y is the height coordinate when looking at the profile and z is the beam coordinate.. The lines of the boat are used to define the hull, of course, in order to build it. you have to loft the boat before you can build it, and lofting is essentially drawing the lines on a big flat floor at full scale.. And apply design ratios. be able to calculate sail area and evaluate a boat's power to carry sail, and be able to design a properly balanced sail plan and analyze and correct problems in existing boat sail-plan balance. 6. be able to calculate required ballast and properly size mast and rigging. 7..
Lofting is a drafting technique (sometimes using mathematical tables) whereby curved lines are generated, to be used in plans for streamlined objects such as aircraft and boats. the lines may be drawn on wood and the wood then cut for advanced woodworking .. Reverse engineering 3d computer hull shapes from 2d lines drawings and offsets tables . stephen m. hollister. new wave systems, inc. www.newavesys.com . there is nothing new under the sun. this quote from an unknown source has been applied many times to the design of boats and ships.. At the moment i am lofting an atkin design for a client in florida. years ago when i was building boats for a museum i found storing loftings on sheets of plywood cumbersome, and so i began lofting boats on rolls of high quality paper. now i can loft a boat in 3'-4' wide paper, roll it up and mail it to a client..
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