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Leopard 45/47 Catamaran For Sale By Owner Location: San Blas, Panama Asking: $359,000 (USD)
S/V Althea is a newly redone 2000 Leopard 45/47 catamaran, for sale by owner. Althea has had her sugar scoops extended by 2 feet to a total of 47 feet to enhance her performance in 2023. The classic Leopard 45, also known as the Moorings 4500, was designed by Simonis Voogd and built by Robertson & Caine in South Africa. When it was introduced in 1997, the Leopard 45 was selected by Cruising World Magazine as Charter Boat of the Year and quickly built an outstanding reputation in the Moorings and Sunsail charter fleets. These catamarans set the standard for comfort, ease of sailing and performance when they were introduced. The layout allows easy movement about the boat from the spacious aft deck, a step down to the swimming platform, or relaxing on the foredeck trampoline. The innovative deck layout brings a host of features to make life and sailing simplicity itself. From the aft deck arch that puts the mainsail sheeting system out of harm’s way, to the ingenious anchoring system, sailing the Leopard 45 is a breeze. The Leopard 45 has robust shaft drives and skeg protected rudders making it well suited to cruising in remote areas.
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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