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This custom Spronk catamaran was built by the legendary designer Peter Spronk in 1979, and then completely rebuilt in 2013 with every surface and every nut and bolt, and piece of equipment added new. The engines have less than 400 hours. Additional autopilot and salon curved plexiglass added in 2018. Blue Moon is no floating condo. It is custom built for performance. Spronks are some of the most beautiful ever built and also some of the fastest. In 2018 the boat was sailed open ocean all the way, from the BVI’s to Marsh Harbour in the Abacos, 930 NM in 96 hours, with sails reefed and big seas the whole way. Part of the reason the boat performs so well is the ketch rig, which is unusual in a catamaran. It allows even a single handed sailor control in heavy or confused seas. It also keeps the main mast at 58 ft. Sailing down the Chesapeake in October 2021 with the head sail and mizzen up and main down we hit 14.5 knots. The slender hulls and low weight tells you why its so fast. The epoxy and Okume ply sandwich makes the boat super strong and stiff. Note the custom slings for the inflatable that’s inside the transom beam; especially secure in blue water. While not nearly as spacious inside as an equivalent production cat, it has room enough for a pleasant week, especially at anchor with its water maker, solar panels and wind generator. Dockside there are three AC systems and electric heads in all three cabin suites. As of October 2022 the boat has been epoxy spray painted matching the original royal blue of the photos. A 2020 survey done for insurance finds the the boat no less than very good condition and praises its up keep. Both engines were serviced under 100 hours ago and new 8D-MHD batteries were installed 2/2021. We moved the boat to St Augustine FL in October. All systems checked as of July 2022. I’ve added side curtains for the cockpit in June. Nice for nasty weather. NEW bottom paint as of September 2022. Give us a call and take a look first hand 2398516265. This boat is ready to sail to the Bahamas tomorrow.
Equipment: 2013 Yanmar 39 HP each under 400 hours Maspower 7 KW 100 hours generator, fire suppression systems for engines and generator, life raft, custom BBQ S/S Delta 50 b w/ Lewmar windlass 2017 rigging and sails new 2012 stack pack 10 Lewmar hatches lines , fenders, Fortress spare anchor all ready to go
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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