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Morgan 1976 33 Out Islander 3’11” draft. 12ft beam, YM30 yanmar diesel
Equipment: Yanmar 3ym30 with 1048 hour. Regular maintain. 50 gallon diesel tank. burn rate about 2 pts an hour, if that. The motor was replaced in 2005. Lazy Jacks , Harkin head sail w/ foil, about 3 yrs old, 130 geno hesd sail.Boat has been rewired , AC & DC with new (1) one new starting 4-6 volt wet batteries which gives it a 480 amp hr. 2 batterie banks which is charged by a Mastervolt 40amp 3bank charger . I do have a 2000 watt inverter w/ switch and all wire and connectors , but I never installed it. VHF GX 2200 that receives AIS which is displayed on a Garmin 740 chartplotter. HVC is a 16k BTU Webasto that is 5 years old. Dodger, Bimini and side curtain. Forespar davits for the Avon 6ft RIB dinghy & 6hp Tohatsu to hang on the back. Also, there is a forespar engine hoist. This Morgan boat qualify for antique boat status, which means it’s only $6.50 a year for Florida registration . I just renewed the U.S. Documentation. Boat is out of the water and in the yard having the bottom Painted also all blisters will be fixed zinc’s will be replaced and thru-hull serviced
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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