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Columbia 10.7 1979
Masthead Sloop with Yanmar Diesel Alan Payne design. About 200 were built between 1976 and 1979. She has a lot of interior volume and not too much exterior wood trim (a plus for maintenance). Powered by Yanmar Diesel.
ACCOMMODATIONS:
Galley to port of companionway with sink, hot plate, toaster oven and refrigerator Large chart table to starboard with seat at head of quarter berth aft and room for chart storage Main salon has L shaped settee to port and straight settee to starboard with large folding dining table/drink holders in the center Head is forward to port with shower and shelf/lockers opposite to starboard Large V berth forward with hanging locker and desk with seat
DECK:
Bimini and dodger Teak grate on cockpit floor Teak cockpit table LifeRing Cockpit seat cushions Propane grill Main and roller furling genoa
Equipment: ELECTRICAL/ELECTRONICS:
12 volt DC system 110 volt AC with cord Horizon LTD VHF Disc player Small solar panel
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 first 66 COLUMBIA 10.7’s were built by Whittaker Corp. at their Chesapeake plant. Later, it appears that at least 180 more were built at other locations and that production lasted at least through 1979.
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