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Maricat 4.3 is a 13′ 9″ / 4.2 m catamaran sailboat designed by Alan Mayer/Claude McCullock and built by Seawind Catamarans starting in 1976.
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)
One of the earliest and most successful beach catamarans from Australia. Many of the earlier boats were sold to resort hotels, sailing schools, etc.
The original builder was J & S Fiberglass until 1982. The manufacturing rights where then taken over some time later by Mariglass (Seawind Catamarans??) until the mid nineties. Later boats were built by Ross Guinea of Brisbane (Brisbane Catamaran Centre).
A few modifications to the original design have been made over the years to keep the cost down. The rear beam and the traveller track were integrated into one extrusion and a one-piece trampoline replaced the original two piece version. The small cruising jib however, was replaced with a larger racing jib.
Still in production as of 2008.
Most often raced in the following configurations:
Class A Cat or UNA rigged single handed.
Class B Sloop rigged double handed.
Class C Supersloop with trapeze, sloop rigged single handed.
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