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Typhoon Weekender. Took it on as a winter restoration project last year and it is now back to the way it should be. This boat was a delight to restore to its original condition and a tribute to the Cape Dory name. Now I understand why there are still so many Typhoons being sailed regularly after 40 years or more.
Equipment: New sails this year include main, genoa with foam luff padding on CDI furler and an Asymm spinnaker. Also has a smaller jib, plus the original sails from 1979. Torqeedo 1003 outboard with bags for battery and motor. All new cabin and cockpit cushions. All new canvas includes covers for main, outboard, winches and tiller. 12-volt system completely rewired and new control panel, LED nav lights, 32 AH battery and solar charger panel. Teak and holly flooring. Cockpit drain stopcocks replaced with ball valves and new hoses so the toilet plunger is now not needed. Igloo cooler and porta potti yet to be used. Coaming boards and all trim was removed, varnished and rebedded, except for toe and rub rails which are sanded and treated with Semco. Trailer was rust proofed and painted and has new wheels, tires and LED lights and wiring.
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)
The DAYSAILER model has a slightly larger cockpit than WEEKENDER.
With nearly 2000 built, this was Cape Dory’s most successful model.
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