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RIO LUNA PROJECT BOAT…PROVEN BLUE WATER CRUISER…$35,000….
Bruce Roberts design, Mauritius ‘43. Hand built by a NASA engineer in Florida. This is a solidly built vessel. The original owner/builder built for a ‘round the world cruise. Started building in 1974 and finished in 1984. He sailed it mostly coastal and Bahamas. We bought the boat in 2001 We sailed the entire U.S. East coast, Bermuda, and Bahamas until 2007. Then we moved aboard with our 2 young children, and cruised full time for the next 10 years. Rio Luna took us as far south as Trinidad, and as far east as Turkey. This is a first class cruising boat. She weighs 14 tons and the hull and deck are extra thick. Plenty of extra fiberglass in the bow. This is not a lightly built production boat. She heaves to easily in heavy seas, and has taken us through several open ocean storms safely and comfortably. She is center cockpit, cutter/ ketch rigged and handles and tracks well. Not a race boat but will exceed rated hull speed easily enough. A comfortable family cruiser, at home on blue water. Rio Luna has a rugged Hydrovane self steering system, a Spectra water-maker, Garmin GPS, radar, Water heater, Freedom battery charger/inverter, refrigeration, three large anchors, each with 200 ft rodes., manual windlass., Air-X wind generator, and Solar panel. Power is a Perkins 65 horse diesel. She has a full keel and skeg hung rudder. Draft is 5.5 feet. The layout is three cabin, with the master cabin aft, port side cabin, and 2 bed V in the bow, plus a quarter berth in the salon. Engine access is easy via two large easily removable panels. The mainsail and mizzen sail were worn out when we got back to Charleston, and have been removed from the boat. Sails remaining include the 140% genoa, the stay-sail, a cruising chute with sock, and a storm tri-sail, never used. The hull and the rigging are sound. Each mast has sturdy steps for easy access to rigging and various systems. Life raft with on deck mount. We had the hull stripped to the glass and repainted in Trinidad after our second Atlantic crossing
Equipment: SSb & vhf,Spectra watermaker, Taylor stove, Hydrovane, Garmin chartplotter and radar,wind generator,solar panel, Rochna primary anchor w/110 ft 3/8 high test chain and 120 3/4 three strand line,large Bruce and Fortress anchors, each with 10 ft 3/8 high test chain and 200 feet 3/4 three strand line, manual windless.
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)
The MAURITIUS 43 is probably the most popular Bruce Roberts design. It is said that nearly 2000 yachts have been built to basic set of plans. Rig types vary. A flush deck version is called the NORFOLK 43.
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