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 √LWLA 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)
First advertised (1963) as the COLUMBIA CLASS.
The COLUMBIA 5.5 has it’s origins with ‘Carina’, a 5.5 METER designed and built by Sigurd Herburn of Norway, winner of the 1958 Scandinavian Gold Cup.
It is said that Columbia used this boat as a plug, (with a few modifications) to build it’s own fiberglass version. Though a development class, no fiberglass 5.5 meters had been built at this time. The International 5.5 meter governing body decided that it did not conform to the class rules. The COLUMBIA 5.5 was raced as a one design class on the west coast US for a few years.
Later it was modified and received a new model designation COLUMBIA SABRE, a cruising version with a trunk cabin, bunks for four and other amenities. Between 300 and 400 SABRES were built between 1963 and 1969. A similar version was also built by Ericson Yachts as the SCORPION 32 (almost certainly from the same molds).
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