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Blue Moon is an elegant ketch-rigged, Spronk catamaran in first-rate condition. Narrow hulls and a compact superstructure give her excellent performance and blue-water capability. The composite epoxy construction makes for a uncommonly stiff and robust platform.
She was meticulously and comprehensively refitted in 2011-2013 by master builder and Spronk connoisseur Jon Westmoreland in St Maarten, Dutch West Indies.
Nothing straddles the decades like Spronk!
Peter Spronk became a legend with the catamaran aficionados by designing and building some of the fastest and most beautiful catamarans ever built.
Blue Moon is one of them!
Custom made in 1979, Blue Moon was completely refitted in 2013 with EVERY NUT and BOLT, EVERY surface and EVERY piece of equipment being redone as new. As of 2020 the twin Yanmar 39 HP engines have only 300 hours on them. The MAS 7K generator has only 80 hours.
Further upgrades in 2018 include 19 feet of new acrylic windows in salon, new autopilot and beefed up steering pump for speeds and sea conditions. The boat was sailed from the BVI’s to the Abacos in heavy weather, with all sails reefed, in 96 hours. That is 9.60 knots average on the open ocean.
The owner reports sailing single-handed in the double digits and finds the ketch rig easy to handle.
It is comfortable with two queen sized berths and en-suite electric heads aft, and a crew cabin forward with en-suite electric head. There are three air-conditioning systems for the at the dock comfort. Solar panels, a wired generator and water maker for out in the wild blue yonder.
She’s a perfect boat for day charters as well!
This is the catamaran that you have been dreaming of!
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)
This listing is presented by PopYachts.com. Visit their website for more information or to contact the seller.
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