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1974 Pearson 39 masthead sloop. This has been a fresh water boat until winter of 2024 when it was trailered to Florida to island hop. At 4.5 draft with centerboard up it is the perfect island hopper. Pearsons are renowned for there strength and speed upwind and Sasha Bear does not disappoint. Upgraded to a Perkins m30 diesel thats very fuel efficient at 1000rpms making 6knots. The boat has a new renogy solar system with 600 watts of panels 2000 watt charger/inverter and 400ah agm house batteries. Sails are like new has new running rigging as well as a new mantus #55 m1 with 125 of 5/16 chain followed by 175 of nylon also has a #45 delta backup on the bow roller and a fluke locked in the cockpit. It is equipped with dinghy davits and comes with an 8 Achilles rib dinghy and a Johnson 3.3 hp 2 stroke. I am currently cruising sw Florida but have but have received news forcing the sale and having to return home. The boat had a complete bottom job before launch w copper base w two coats of interlux followed by 2.5 coats of spartan multiyear.
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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