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38 ft Mason Ketch 1976. Ideal live aboard with huge storage, well laid out galley with 4 burner stainless steel range. New Yanmar 4 cyl engine in 2020 and rebuilt hydraulic dive Spacious teak and rosewood interior 38 x 12 ft beam x 6ft draft approx 30,000lb displacement Winter capable with fully insulated hull, Dickinson diesel gravity furnace. Enclosed head with shower. Full cut away keel with keel hung rudder. 2019 clean out of water survey Huge frig/freezer Designed for off shore cruising, and has been extensively renovated. Massive private forepeak double berth and double quarter berth Full size extra deep stainless double sink Force ten 4 burner gimbled propane range Large Teak fold down table than hinges to stbd to allow seating for 4-6 people Full chart size Chart table stows behind settee. Ketch with sails in good cond. Furling working jib Second forestay (furling) with hanked on larger head sail Aluminum masts/booms with extra heavy standing rigging Missen staysail Fully battened main and missen. Re-galvanized 200 ft chain with bruce anchor in heavy built double roller 200ft rope with short chain available from deck with danforth second anchor deck mounted hardwired remote anchor controller in cockpit and at bow Custom built one-off in Vancouver GRP Heavy layup cored hull Deck is balsa core GRP built up over plywood form Stern davits and hard shell 8ft tender BBQ GRP Hard Dodger with safety glass Hydraulic wheel steering in aluminum pedastle 2 35lb propane tanks in aluminum stern locker (seat) propane water heater Extensively re wired with 2 12 circuit breaker panels with LEDs.Yanmar gauges/switches mounted in consol over companionway automatic charger
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)
Mason design # S-116.
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