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CS Yachts very popular 27-foot sloop, fiberglass hull, 5’2”- draft, 9’3”- beam, inboard Yanmar engine 8HP, can accommodate of five of people, standing headroom, comfortable interior and a good sailing performance she’s an excellent value; washroom, hanging locker, life jackets-4, 2-burner alcohol stove, ice box, sink. Her sailing inventory includes newer main, Harken furling; jib, genoa and the good condition another two main and genoa, main sail cover. Also a lot of other equipment like: Danforth anchor, standard winches-6, whisker pole, cockpit cushions, Raymarine knot meter and depth sounder, VHF and FM/AM-cassette radio, outside propane BBQ, fire extinguishers, battery-2 and new main switch, manual bilge pump, new main, boarding ladder, steel folding-winter storage cradle. She is ready for sailing any time and any condition.
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)
The optional shoal draft model has a longer bolt-on lead keel.
Draft: 3.92’/1.19m
Displacement: 6500 lbs./2948 kgs.
Ballast: 2800 lbs./1270 kgs.
Sail Area/Disp.: 15.71
Bal./Disp.: 43.08%;Disp./Len.: 212.02
About 90 boats were fitted with these lead fins.
In 1977, the rudder area was increased. CS also offered owners a rudder retrofit kit that added two inches to the forward edge to improve helm balance. Three years later, the mast was changed from a Proctor to an Isomat section, the fibreglass cabin sole was replaced with teak and holly , and cupboard doors were finished with woven cane fronts. The Yanmar YSE was replaced with the 1GM as standard equipment. Drawing shown here is from introductory brochure.
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