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Thinking of a circumnavigation, ocean passage or just local sailing, Omuramba 3 deserves to be looked at. She was custom built in Ontario, Canada in 1998, by Scorpio Custom Yachts, an offshoot of Gozzards to a Rob Ladd design. 53 LOA, 15-7 Beam, 7-3 Draught Divinycell foam core. Warm in winter, cool in summer. External lead keel, modified fin, 11/4 s/s keel bolts with heavy backing plates. Topside is teak, glued down. Cockpit is comfortable, with Edson pedestal. Mast is a Hood, with in mast electric furling. Both headsails are on Harken roller furlers. Winter of 2021 the mast was removed and she was taken into a shed. Here the hull below the waterline was soda blasted to remove the old bottom paint and gel coat. She then received six coats of Interlux 2000. The mast, boom and radar pole were stripped down to the aluminum , then painted with Awlgrip white. The cabin was also painted. Before re-stepping , all the mast wiring was replaced as well as all the lights on the mast. These included new LED spreader lights, masthead LED tricolour and steaming light. In addition, all standing rigging, including turnbuckles, was replaced, along with all the mast and boom sheaves, plus a new mainsail halyard. Accommodations: 2 master staterooms, each with head. Aft head with electric toilet and large walkin shower. Safe workable galley with double sinks, 3 burner Force 10 stove, freezer, fridge, microwave and ample food storage. Comfortable dining area adjacent to galley. Spacious salon. Forward of forward head is a workshop area with mounted vise and tool storage.
Equipment: 2022, Winston Thunder Sky lithium batteries were installed, with a REC battery management system, along with a Balmar smart battery condition gauge.. Eight 100watt solar panels were also installed . Controlled by four Victron MPPT charge controllers they do an excellent job of keeping the batteries charged. The engine start battery is a 4d West Marine AGM. A Westabeke 7.5KW generator provides power for the A/C and water heater. The inverter or generator can be used for the microwave, washing machine or receptacles throughout the vessel. The mainsail was new in 2022. An Avon rib stores on deck. Easily launched and retrieved by a spinnaker halyard. The dodger and Bimini are both new in June 2024. Six man liferaft new May 2023.
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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