The S2 11.0 Sailboat

The S2 11.0C, a centre-cockpit sloop, was designed by Arthur Edmunds and built in the USA by S2 Yachts.

'Haven', an S2 11.0C sailboat setting off on a passage from Guadeloupe to Antigua

The vessel shown above and described here is the centre-cockpit 11.0C version. There's also an aft-cockpit version known as the 11.0A.

Published Specification for the S2 11.0C

Underwater Profile: Fin keel with skeg-hung rudder

Hull Material: GRP (Fiberglass)

Length Overall: 36'0" (11.00m)

Waterline Length: 28'3" (8.6m)

Beam: 11'11" (3.6m)

Draft: 5'6" (1.7m) deep draft version; 4'6" (1.4m) shoal draft version

Rig Type: Masthead Sloop

Displacement: 15,000lb (6,804kg)

Designer: Arthur Edmunds

Builder: S2 Yachts (USA)

Year First Built: 1980

Year Last Built: 1987

Number Built: 66

Published Design Ratios for the S2 11.0C

1. Sail Area/Displacement Ratio: 15.8

Less than 16 would be considered under-powered;
16 to 20 would indicate reasonably good performance;
Over 20 suggests relatively high performance.

2. Ballast/Displacement Ratio: 37.5

Under 40: less stiff, less powerful
Over 40: stiffer, more powerful

3. Displacement/Length Ratio: 317

Under 100: Ultralight
100 to 200: Light
200 to 275: Moderate
275 to 350: Heavy
Over 350: Ultraheavy

4. Comfort Ratio: 29.9

Under 20 indicates a lightweight racing boat
20 to 30 indicates a coastal cruiser
30 to 40 indicates a moderate offshore cruising boat
40 to 50 indicates a heavy offshore boat
Over 50 indicates an extremely heavy offshore boat

5. Capsize Screening Formula: 1.9

Under 2.0 (the lower the better): Better suited for ocean passages
Over 2.0: Less suited for ocean passages

Summary Analysis of the Design Ratios for the S2 11.0C

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1. A Sail Area/Displacement Ratio of 15.8 suggests that the S2 11.0C will need a stiff breeze to get her going. In light conditions, unless you've got plenty of time on your hands, motor-sailing may be the way to go.

2. A Ballast/Displacement Ratio of 37.5 means that unless the bulk of the ballast is concentrated in a bulb at the foot of her keel, the S2 11.0C will have a tendency to heel excessively in a gust, and she'll need to be reefed early to keep her sailing upright in a moderate breeze.

3. A Displacement/Length Ratio of 317, tells us the S2 11.0C is clearly a heavy displacement cruising boat. You can load her down with all your cruising gear and equipment and it will hardly affect her waterline. Not an ideal choice for coastal sailing, but she'll come into her own on an offshore passage in testing conditions.

4. Ted Brewer's Comfort Ratio of 29.9 suggests that crew comfort of a S2 11.0C in a seaway is similar to what you would associate with the motion of a moderate bluewater cruising boat - a predictable and acceptable motion for most seasoned sailors.

5. The Capsize Screening Formula (CSF) of 1.9 tells us that a S2 11.0C would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.