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Fun boat to sail. Good for sunset cruises The wide cockpit invites congenial conversation 4 berths (ahem after kicking a sail onto the sole) Performance low freeboard Glenn Henderson design . Wide beam helps to keep the boat flat. 4 podium appearances in Chicago Mac Light weight yields low loads when trimming. Numerous solo Macs.
Hull: Kevlar Mast: aluminum; permanent back stay (trimmable) ; running back stays; check stays 2 head sail halards; 1 spinnaker halyard; 2 reefs in main Sails: 3Di main; 3Di genoa; Kevlar and carbon #3; Dacron #4; Dacron storm jib Motor: Yanmar GM10; Rebuilt in 2007; Transmission: Yanmar SD20 sail drive .Rebuilt lower end this year, 2024 Systems: Nexus; Garmin; Ray Marine (remote control tiller auto-p Dual axle trailer.
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)
Replaced with an entirely new C&C 33 in 1984.
The C&C 30E, (1977-1982) built and sold in Europe, was based on this design.
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