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Seller’s Description 1980 Shannon 38’ Ketch for Sale $75,000 Well maintained, beautiful, blue water cruiser. Shannon’s reputation for seaworthy design and craftsmanship is exemplified in their 38’ ketch. Overhauled in 2016/2017: New teak cap/toe rail. All deck hardware removed and rebedded, deck and masts painted, new Bimini & dodger, new lifelines. New electronics. New charging system in 2023. For more information call 352-477-0025. Chelsea is currently in Brunswick, GA. Purchased Dec. 2015 2016-2017 Replaced the cap rail & toe rail - teak Painted the deck and masts New water heater Replaced lifelines E-purb All deck hardware removed and was reset with butyl putty Cozy Cabin propane heater 2-100W flexible solar panels (mount on the bimini) 2018 2 Raymarine Charplotters Raymarine Radar Achillies dinghy, 3.5HP Honda 4 stroke outboard Victron battery monitor New life lines New Bimini & Dodger 2020 Pulled the engine, inspected & replaced gaskets and seals New shaft and cutlass bearing 2021 AIS - sends and receives positions 2023 2 Lithium house batteries 105AH Blue Heron 1 AGM starter battery Victron DC-DC charger Victron smart 12V battery charger Balmar 621 series alternator & charging kit $1,000
Equipment: See description
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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