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)
Very early ‘power/sail hybrid’ from Sweden. The brainchild of Gusta Erikson.
One unique feature is the twin rudders with the outboard mount in between.
2 piece mast for ease of stowing.
(More information is being acquired)
This from Sara Erikson, daughter of the designer:
My father, Gusta (Gus) Erikson, designed and built the SkiBreeze, starting the production in 1957 and continuing until around 1965. The hulls were hand-made in our factory at Scandia Boatyard, Uddevalla, Sweden, and probably among the first fiberglass hulls to be built in Sweden. We had one of the first boats in this series and tested it for sailing, motoring and waterskiing - my father’s ambition was to have it multi-functional, but I always felt it was at it’s best under sail. We used to win sailing races all the time with it thanks to it’s ability to plane and because we could raise the centerboard and get through shallow passages where other boats couldn’t go.
According to Jay Mixter a number were orinally imported to the US (100?).
Drawings available at the Swedish Maritime Museum (Jac. Iversen Collection).
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