Tread Lightly Study Plan Download
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Gavin Atkin moved house. The length of his new garage would enable him to build boats up to about 13 ft long; he is famous for one sheet (2440 x 1220 mm plywood) boats. Don Elliott sang the praises of an 8ft cruiser with fully closed in but awfully claustrophobic cabin, Stuart of Maximum Exposure fame made a disastrous start to his attempt to sail single-handed around Great Britain, a friend of mine bewailed the amount of time and money needed to build something which he could cruise for a month or so, I found that high strength carbon fibre and /or fibreglass tubes are getting pretty cheap.
All of these are related.
A month at 2 kg of food a day is 60 kg, this would include an allowance for stove and lamp fuel, with a weeks water at 3 litres a day the voyage consumables stores weight would be 81 kg. Given an 80kg skipper, 25 kg of ground tackle spread between two good sized anchors with some chain and 20 fathoms of nylon warp on each, an allowance of another 25 kg for clothing, pots and a camp stove we're up to a bit over 200 kg (440 lbs) of "cargo" we have to carry.
From this drawing calculations are made as to weights, stability, load carrying ability, centres of buoyancy, gravity, effort and lateral plane, Prismatic and block coefficients, sail area to displacement, water plane loading, water flow paths, foils, sail area and distribution, structural loads and how to carry them, ergonomics and economics, building method and on and on.
BEAM - 1.5M - 5 FT
WEIGHT - 300 KG - 661 LBS INC C/BOARD
BOARD UP - 0.20M/8IN -
BOARD DOWN - 1M/3FT 3IN
SAIL AREA - 11.5 SQM - 123 SQFT