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For sale (UNDER DEPOSIT) is my Precision 23 built in 1990 by Precision Boat Works: precisionboatworks.com/boats/p23 Sail number 258. Very fast boat, we regularly hit 6.7 knots with sails up. Considered to be a “maxi-trailerable”, sits on the 2003 Performance double-axle trailer, all 4 tires are road-worthy, plus a brand new spare. Easily pulled by our 4-Runner. Comes with the furling genoa and main sail, “A-frame” mast raising system, anchor with chain and rode, bilge pump, Origo alcohol stove, battery, VHF radio with mast antenna, compass, depth and speed. Wisker pole and life ring mounted on the rail. Cooler, porta-potty, small sink with 5-gal tank. Auxiliary power by 2011, 4-stroke, 6hp Tohatsu, long-shaft outboard, 3-gal tank and fuel hose included. Previous owner ran to some trouble at the dock which caused the gel coat scratches on the starboard side, see the brighter spot below the hull registration in one of the included pictures. I fixed it by applying a gel coat patch, but it probably needs some re-sending and better color matching. Also, there were a few gel coat chips on the cabin top that I fixed. All cosmetic, shows well for its age and is very dry, no leaks. Served us well in Long Island Sound and local lakes in Connecticut. Reply to this ad or call me at 8_siks_0 839- seven_nine_siks_1. Thanks for looking.
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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