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Original Charley Morgan 41 race/cruiser. Off grid capable cruiser. Electric motor with 20,000 watts hours of battery capacity. 1,415 watts of solar power. Watermaker, davits, dinghy, 55lb anchor, 175 ft chain.
Centerboard is removed. The orifice is heavily fiberglassed with 10oz cloth.
Equipment: - Quiet Drive 20 motor - 400ah 48v lithium iron phosphate battery bank - 1,215 watts of solar for 48v - 3,000 watt 48/120v inverter - 300ah 12v battery - 200 watts of solar for 12v - victron solar chargers, battery monitors, and inverter - 17gph 12v watermaker - B&G chartplotter, auto pilot, and remote, depth speed temp - Raymarine wind transducer and linear drive - Tigress windlass - 175ft g4 chain - Vulcan 55lb anchor - Martek 600 dinghy davits - Highfield ultralight 290 dinghy - Newport Vessels electric outboard motor and 36v batteries - lewmar 48 self tailing primary winches and 30 evo mast winch - Garhauer rigid boom vang - Hillerange oven and 2 stove - 12v Danfoss refrigerator - Fiberglass propane tank - Electric toilet - Interior and cockpit cushions - Extra sails - Harken Roller furling - 15lb fortress anchor - Hundreds of feet of extra 3 strand and halyard rope - Flare gun - Rapid ditch survival bag - Spare pumps - Spare depth, speed, temperature transducer - Spare Raymarine wind vane transducer
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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