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Chrysler 20, 1979 with outboard and trailer asking $1900 Norman, Oklahoma
LOA 20’, Beam 7’11” Shoal keel with weighted swing centerboard, draft 1’11” board up - 5’7” board down Displacement: 2200 lbs (ballast 410 lbs) Jib and Main sail area: 193 sq. ft. Designed by Halsey Herreshoff
The C-20 is a stable, robust masthead sloop with a large 10’ 6” cockpit and a small 9’6” cabin.
There is standing-room in the cabin with the hatch slid forward. It has 4 berths. The 26’ mast is supported midships with a forestay, backstay and 3 shrouds on each side. The boat is showing its age but would clean up well with a little TLC. The running rigging is functional but due for replacement. It was last sailed, comfortably in winds to 25 mph, on June 10, 2020. The bilge is dry.
This is being sold by the Lake Thunderbird Educational Foundation. Contact par2058@yahoo.com
Includes:
Nissan 5 HP 2-cycle outboard (model NS 5B, 1994) with fwd/reverse - fuel system just cleaned out and runs well. 5 sails in good to excellent condition: crisp North Sails main, near-new crinkly Rolly Tasker small jib with raised foot, genoa with extra sheets, Vector Chrysler 20 “Main Lapper” (large jib), and older main. Heavy duty trailer with tongue extension, spare tire, and lights. Jib sheet winches. Stern rail, bow pulpit, stanchions and lifeline. Anchor, chain and 1/2” nylon rode. Rule 500 GPH bilge pump. Marine battery charger, electrical panel, and stern, bow, cabin and masthead lights Collapsible oar, paddle, boat hook, and ladder 3 fenders, 2 PFDs, 2 throwable cushions, sail and tiller covers
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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