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FOR SALE: 27’ Sun Yacht Sloop s/v Barcelona, a 1979 Sun Yacht 27. $11,000 This cruiser was built in the Pacific Northwest, but sold first by a dealer in Wisconsin, likely spending its entire life in the Great Lakes. A solid, comfortable cruiser, but she performs admirably in heavy wind with the mainsail and newer 135 Genoa from Kent Sails, with a hull speed of nearly 8 knots. The hull style was designed by famed naval architect Ed Monk Jr., and sold under several names for just a few years in the late 70s and early 80s, so it’s a rare jewel of quality craftsmanship. Only 175 of these were ever built. Recent upgrades include: Updated electronics, such as a gently used Garmin 70s Chartplotter with platinum charts and new in-hull transducer for depth data, and a brand new (2022) Raymarine ST40 Windmeter. Gimbaled stove was removed and replaced with a mini-fridge. Microwave and Marine Radio included. Sale price includes a custom cradle for winter storage (currently at Island Harbor Marina), and paid summer slip fee for this season at Trader Todd’s Marina, both in St. Clair Shores, MI.
Hull ID: SYV27151M79C MI Reg: MC1140LA Masthead Sloop, Fin Keel, Spade Rudder 15hp OMC SailDrive 2-stroke (gasoline/oil mix) inboard, motor serial no. 322185 LOA: 27.5’ LWL: 22.5’ Beam: 9.0’ Draft: 4.3’ Water: 16 gal. Fuel: 15 gal. Displacement: 6200 lbs. Ballast: 2300 lbs. 2 mains, 2 jibs, & a spinnaker. Designer: Ed Monk, Jr.
Equipment: Garmin 70s Chartplotter with platinum charts New in-hull transducer for depth data (2022) Raymarine ST40 Windmeter. Mini-fridge Microwave VHF Marine Radio Custom cradle for winter storage (currently at Island Harbor Marina) Paid summer slip fee for the 2023 season at Trader Todd’s Marina in St. Clair Shores, MI.
Hull ID: SYV27151M79C MI Reg: MC1140LA Masthead Sloop, Fin Keel, Spade Rudder 15hp OMC SailDrive 2-stroke (gasoline/oil mix) inboard, motor serial no. 322185 LOA: 27.5’ LWL: 22.5’ Beam: 9.0’ Draft: 4.3’ Water: 16 gal. Fuel: 15 gal. Displacement: 6200 lbs. Ballast: 2300 lbs. 2 mains, 2 jibs, & a spinnaker. Designer: Ed Monk, Jr.
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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