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2009 Corsair Sprint 750 A nice example of the fast trimaran
Deck: Stainless Steel bow pulpit Roller furling jib gear Furling jib with UV cover Stainless Steel anchor roller Anchor locker with anchor, rode and chain Retracting bow sprit Rotating mast Roller furling boom system Main sail cover Rope clutches for halyards Jib sheet fairleads on tracks Adjustable synthetic shrouds 4x rope clutches Harken self tailing sheet winches on deck Harken self tailing winches on deck
Cockpit: 6hp Tohatsu sailor deep shaft outboard 6:1 main sheet 4:1 main sheet traveler Winch handle holder Asymmetrical spinnaker, unused spinnaker w/ gear Cabin: V berth with large overhead opening hatch Storage behind settees Standard Horizon VHF radio Breaker/switch panel Battery control switch Manual bilge pump Marine head Portapotti
Galvanized single axle Pacific trailer Mast raising system
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)
Beam folded: 8.16’/2.49m
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