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SNAPDRAGON 27 - CAOL MOR Built 1973 by Thames Marine, Canvey Island, Essex. British Registered (Part 1). Fin Keel with skeg - hung rudder. Tiller steering. Steering Compass. LOA 8.28m, 27’ 2’’ LWL 6.93m, 22’9’’ Beam 2.59m, 8’ 6’’ Draught 1.4m, 4’ 6’’ Displacement 2495kg, 5500lbs, Ballast 998kg, 2200lbs. Yanmar YSE12 inboard diesel engine. 10 Gallon fuel tank. A dual battery start/lighting system is fitted. Mast and boom by Z Spars with stainless steel standing rigging, new (1991). Fully battened mailsail (1995) with lazyjacks, roller furling headsail. Self-tailing sheet winches. Sail cover, sprayhood and dodgers. Spinnaker pole. 25lb CQR anchor, 55m 5/16’’ chain,35m warp. Anchor windlass. VHF radio,echo sounder,log, autohelm, radio/cassette player. Navigation lights. Six berths. Gas cooker with two burners, grill and oven. Stainless steel sink. Dry powder fire extinguishers. Fire blanket. 100 litres water in two collapsible tanks. Jabsco sea toilet in separate heads compartment. Fenders and warps. Two horseshoe lifebuoys. Boarding ladder. Flagstaff and ensign. Bilge pump. Two inflatable dingies, outboard bracket and Honda 2.5 outboard. Caol Mor has been laid up on the hardstanding at RB Marine Ltd, Rosneath, G84 OPU for the past two years, due to the owners illness and subsequent death. The boat keys are held at the offices of RBMarine Ltd. An asking price of around £4,000 is expected. The vessel is being sold in an “as is where is” condition and although the writer has reported in good faith his position is reserved in respect of concealed damage,latent defect and inherent vice. Interested parties should contact the writer Angus Macleod at 07879603068
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
SA/D = SA ÷ (D ÷ 64)2/3
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Ballast / Displacement * 100
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
CSV = Beam ÷ ³√(D / 64)
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