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)
The C&C 30 Mk1, was in production for more than 12 years, longer than any other C&C model.
During this period there were various small upgrades.
The first boats came with a swept back, shark fin type keel/rudder configuration.
In 1976 the rudder was changed from spade to a higher aspect shape. In 1978 the boom was raised a foot.
Initially, the Universal Atomic 4 gas engine came as standard equipment. The QM15 Yanmar Diesel eventually became an option, up to hull no. 675. The QM was superseded by the Yanmar 2GM beginning with no. 676; otherwise, the remaining changes were minor.The dinette table support changed from a vee support to a post; the windows changed from the original aluminum frame type to an integrated, smoked plexiglass unit glued directly into the cabin structure. In an attempt to find the ideal bushing for the rudder post, various types were incorporated into the rudder tube over the years; and various minute detailing changes were made throughout the boat, especially in interior teak detailing.
All 30s were built in Niagara on the Lake, Ontario.
Shallow draft version: 4.2’.
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