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Classic Sparkman & Stephens-designed Tartan 27 Mooneshine now available and ready to sail away. Practical Sailor magazine called the Tartan 27 a complete, substantial small yacht, whose excellent original construction quality and design justify the expenditure required to bring the boat up to date. Enjoy the effortless sailing experience of the combination full keel and centerboard, which can carry you far offshore or into the shallowest coves. After a full refit in 1995including deck re-core and new chainplatesMooneshine was repowered with a Universal M18 diesel in 2014 and new fuel and exhaust systems. Relax below on custom Kinder cushions. New topsides paint. Sails replaced in 2015. Original roller-reefing system and many original details.
Equipment: All sails: main, spinnaker and several hank-on head sails good condition. Repowered with Universal M18 in 2012. New fuel and exhaust systems. Good condition interior cushions from Kinder Inc. New topsides paint. Gusher Whale manual bilge pump. Original roller reefing system Port-a-potty
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)
712 boats built. Available as as sloop or yawl.
See TARTAN 27 for more details.
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