c&c 27 sailboat data

To keep George Cuthbertson's design current, C&C produced four versions of the original 27. Internally, C&C only used the Mark I and Mark II designations, the first for the original hull-form and the latter for a stretched and subtly reshaped development from the original. Other changes were made, however, and to recognize the changed character of the boat, 27 sailors have designated these as the Mark I, the Mark II (aka, the Mark IA "Tall Rig"), the Mark III and the Mark IV. After production of the Mark IV ceased, C&C introduced a completely new boat named the C&C 27; this boat, described in Sea Change , is generally known as the Mark V.

In addition to descriptions of the changes made to the original design through four variations, this page includes:

• general specifications ,
• genoa and spinnaker specifications and
• mainsail specifications .

The images on this page show the C&C 27 Mark IV; see the Overview page for images of a Mark I and Sea Change for the Mark V. Photos showing notable differences in the versions are shown on the Guide pages.

Mark I: Hulls 1 to 215 were produced from 1970 to 1972. The Mark I's had the slightly shorter hulls, and the shortest rigs with two side shrouds, (one lower and one upper). Their mainsail travellers were aft in the cockpit. They all had tillers, and Universal Atomic 4 gas engines. A few of the very first hulls were built under licence by Hinterhoeller Yachts.

Mark II: Hulls 216 to 451 were produced from late 1972 to 1974. The Mark II hulls were the same as the Mark I's. Their sail area also remained the same but they had a two-foot-taller, "higher-aspect" rig, and their standing rigging now had 3 side shrouds (two lowers and one upper). The aft-travellers, tillers, and Atomic 4 gas engines also remained the same.

Mark III: Hulls 451 to 914 were produced from 1974 to 1981. The Mark III was really cast from a new mould. The hull was stretched, with six inches added to the cockpit/stern area, but no change in the beam. Draft was increased, ballast was decreased, and the overall displacement remained the same. The rig height was again increased by another 2 feet, this time with an increase in sail area. The rudder took on a higher aspect shape. Early Mark III's had clear port lights with aluminum casings. These were later replaced by a recessed design with smoked acrylic. Later hulls had an anchor locker in the bow, and lifelines became toe rail-mounted. Small changes were made to the interior detailing, but the basic layout remained unchanged. A key change in the Mark III was that the cockpit was lengthened, and the traveller was now mounted forward. This opened up the cockpit, and wheel steering became the popular option in 1975. Diesel power became available in 1978, and by the end of the Mark III's run, the single-cylinder Yanmar diesel had become standard.

Mark IV: Hulls 915 to 984 were produced from 1981 to 1982. The greatest change was cosmetic, with the primarily teak interior giving way to the style adopted in the rest of the C&C line: off-white melamine trimmed with teak and dark-anodized aluminum mouldings. Reportedly, there was consideration to marketing the boat as the Landfall 27 ( Landfall distinguished C&C's purely cruising-oriented offerings from the cruiser-racers that were the foundation of the company's reputation). Other substantial changes included setting the forestay back about seven inches to accommodate a bow roller and upgrading auxiliary power to a two-cylinder Yanmar (though many boats were built with gas engines).

Specifications

The information below is for general reference. Class-sanctioned measurement data can be found in the C&C 27 Class Association Constitution & Rules .

Hull No. Year Built LOA LWL Beam Draft Ballast Disp. Rig Ht. Sail Area Mark I 1-167 1970-72 27'-4" 21-0" 9'-2" 4'-3" 2512 lb. 5500 lb. 33' 0" 343 sq. ft. Mark II 168-451 1972-74 27'-4" 21-0" 9'-2" 4'-3" 2512 lb. 5500 lb. 35' 0" 343 sq. ft. Mark III 452-914   1974-81 27'-10.5" 22'-10.5" 9'-2" 4'-6" 2116 lb. 5500 lb. 37' 0" 372 sq. ft. Mark IV 915-979 1981-82 27'-10.5" 22'-10.5" 9'-2" 4'-6" 2116 lb. 5500 lb. 37' 0" 372 sq. ft.

Maximum Spinnaker & Headsail Measurements

Roll your cursor over the rig diagram above to see major measurements visually defined. You can find more precise definitions along with terms primarily of interest to official measurers and sailmakers (such as MGM, the mid-girth of the mainsail) on the ISAF's sail measurement pages.

I J JC LP SPL WPL SMW Mark I 33'0" 11.75 13.4 19.39 (165%) 13.4 15.51 24.12 (180%) Mark II 35'0" 11.75 12.5 19.39 (165%) 12.5 15.51 22.50 (180%) Mark III 37'0" 11.75 11.75 18.21 (155%) 11.75 14.57 21.15 (180%) Mark IV 37'0" 11.17 11.75 18.43 (165%) 11.75 14.74 21.15 (180%)

Maximum Mainsail Measurements

P E HBL MGU MGM     Mark I 28.5' 10.5 0.50 4.25 7.08     Mark II 29.0' 9.5 0.50 3.97 6.59     Mark III 31.0' 10.0 0.50 4.15 6.88     Mark IV 31.0' 10.0 0.50 4.15 6.88    

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C&C 27 MK V

C&C 27 MK V is a 26 ′ 6 ″ / 8.1 m monohull sailboat designed by Robert Ball and C&C Design and built by C&C Yachts starting in 1984.

Rig and Sails

Auxilary power, accomodations, calculations.

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

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

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

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

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

Displacement / Length Ratio

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

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

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 Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

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 27 MK V is a new design replacing C&C’s earlier 27 footers. It was built in Canada as well as the US. The Yanmar diesel was an option. Shoal draft: 3.5’/1.067m Disp. 4080 lbs./1852 kgs. Ballast: 2075 lbs./941 kgs. Photo courtesy Adam Hunt.

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C&C 27 mk iv

The c&c 27 mk iv is a 27.86ft masthead sloop designed by rob ball and built in fiberglass by c&c yachts between 1981 and 1982..

The C&C 27 mk iv is a moderate weight sailboat which is a good performer. It is stable / stiff and has a low righting capability if capsized. It is best suited as a day-boat.

C&C 27 mk iv for sale elsewhere on the web:

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C&C 27 MK III

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