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Classic Cape Dory 30 cutter rig currently set up as a sloop rig. New rolling furler with brand new North Sails 130 Genoa. Mainsail in good condition. New halyards for the main and Genoa. Lazyjacks and sail cradle in sunbrella. Bronze Spartan hardware and portholes. Volvo penta diesel. Nature’s head composting toilet, solar panel, propane stove with oven. Holding tank has been removed from v berth, extra storage created. Bottom paint fall 2019, monthly dive service keeps it clean. Needs a depth finder, has some soft spots on the deck, and needs the stuffing box repacked. Slip does not convey.
Equipment: Rolling furler, lazyjacks with sail cradle, 25lb anchor with 20ft chain and 120ft rode. 3 burner stove with oven, solar panel, battery charger, 30amp shore power cable, drop in refrigerator, extra lines, Spartan hardware and seacocks.
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)
(formerly listed as CAPE DORY 30 KETCH)
Also available as a cutter. (CAPE DORY 30C).
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