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2005 Gemini Catamaran 105 Mc built by Performance Cruising in Annapolis, MD, It’s All Good is in excellent condition with all mechanicals functional. This is a fresh water boat in Lake Champlain moored in Beech Bay, South Hero, Vermont. 14- foot beam allows it to fit in a standard slip, unlike many catamarans. The boat comes with full cockpit screen and Isinglass enclosure. This boat was refinished from the waterline up (deck and topsides) in 2021 with Quantum 99 two part acrylic with non slip additive used in non skid areas of the deck. The bottom is painted yearly with Pettit eco copper-free ablative paint. Winter storage is full vinyl wrap on the hard at Moorings Marina in Malletts Bay, VT. Four sails; Main (340sf), Genoa (320sf)), Screecher (420sf with factory installed screecher track) and a smaller jib (160sf) created for the Gemini by Vermont Sailing Partners move the boat under sail at approximately half wind speed up to 12 reported knots. All sails adjusted with the benefit of travelers for better trimming. The mainsail has lazy jacks on a stackpack for easier management in stronger winds. All foresails are on furlers with the furling lines managed from the cockpit. Westerbeke 30B 27 hp 3 cylinder engine has approximately 1450 hours. Low motor hours due to being used only for docking during the season and occasional low wind runs back home. The outdrive boot has been recently replaced. The diesel fuel is treated for water, ETOH, and growth regularly. Both diesel tanks removed and power washed every 5-7 years. The motor and rudders tilt up to allow an 18 draft (28 with motor down) for pulling right up to beaches and well inside most boats in crowded anchorages. The asymmetric foam cored fiberglass centerboards in each hull can be adjusted down to a 5.5 foot draft (4 feet below the hull). The steering cables were replaced in 2018 and are lubricated only with liquid lubrication. There is a 100 w solar panel mounted on the rear davits that keeps the 3 bank batteries charged. A 3 seat Portaboat 10 dinghy can be folded and stored on deck or on the davits. A
Equipment: Stove, refrigerator, microwave, inverter, full cockpit screen and Isinglass enclosure, portabote dinghy with 2.5 Lehr propane outboard, radar and gps, four sails (smaller jib added to standard Gemini sails), solar panel, head and shower.
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)
GEMINI 105MC is a development of the 105M with a number of interior updates. Most visibly, however, the cockpit of the 105Mc can be temporarily enclosed with either canvas or solid panels.
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