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Classic Sparkman and Stephens Swan. Custom keel, rig and interior. In very good condition.New deck, restored to perfection, all fittings and fiberglass completely rebuilt, hull portifino green very good condition, bottom was completely stripped, and barrier coated, primed with 2 coats, 2 coats of Seajet ablative Antifouling. Boat is a perfect blue water, liveaboard cruiser racer. Vat paid, USA coastguard registration. Located on the beautiful west coast of Italy ready to sail anywhere.
Equipment: GPS, Chartplotter, VHF, SSB, Radar, Autopilot, EPIRB, All safety equipment including life vests, lifeboat for 10 recently revisioned 2023, 220/110volts with customToroidal Transformer 3 KVA, inverter 300W at 220, 400W at 110. Large 4 burner Gimbaled stove with gas oven, new Dometic AC/Heat Climatizer, new electric bow head, and much, much more.
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)
S&S design #2201.
A slightly later variant (with keel/cb) was called the NYYC 48.
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