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“China Doll” is a Stan Huntingford double-ender designed for comfortable, safe, and seaworthy long-distance cruising. She features a dual-cockpit design that provides an aft cockpit from the master cabin and a center cockpit for everyone’s use. She is fully equipped for offshore cruising.
This was the second of the eight built. Passport is a semi-custom builder that the boat’s first owner took great advantage of. He was a very experienced sailor and a competent engineer. Many of his requests were included in subsequent builds.
These boats have a reputation of being very beautiful, well-built, and practical.
Equipment: - Ocean Industries DCII electrical panel with AC and DC ammeters and voltmeters - AC main breaker with polarity indicator Batteries - Two Group 27 West Marine 15020126 flooded lead acid starting batteries located to starboard in the engine compartment (2021) - Four Group L16 Full River DC400 415 AH batteries located on the port side in the engine compartment (2021) - One Trojan U1-AGM 34 AH for generator start located port in the engine compartments - NAPA marine/RV deep cycle battery for the windlass (2023) - Northern Lights Model E673L 6 kW diesel generator (2013) - Magnum Energy MS2012 2000W with 100 amp charger12V Pure Sine Inverter/Charger (2021) - Kyocera Model KC85TS 87-watt solar panel - Blue Sky solar charge controller, Solar Boost 3024i - Magnum Energy state-of-charge voltage monitors - Blue Sky IPN-Pro remote, switched digital, state-of-charge, and Solar voltage monitors (2008) - 50 amp 120/240-volt shore power inlet port side of cockpit and cord - AC and DC power distribution panel with rev. polarity indicator - GFCI protection for galley, heads, and other wet areas
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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