The Allied Seawind II Sailboat
(aka Seawind 32)
Specs & Key Performance Indicators

Published Specification for the Allied Seawind II

Underwater Profile: Long keel

Hull Material: GRP (Fibreglass)

Length Overall: 31'7" (9.6m)

Waterline Length: 25'6" (7.8m)

Beam: 10'5" (3.2m)

Draft: 4'6" (1.4m)

Rig Type: Cutter

Displacement: 14,900lb (6,759kg)

Designer: Thomas Gillmer

Builder: The Allied Boat Company (USA)

Year First Built: 1975

Year Last Built: 1982

Number Built: 11

Published Design Ratios for the Allied Seawind II

1. Sail Area/Displacement Ratio: 13.6

• 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: 38.9

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

3. Displacement/Length Ratio: 401

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

4. Comfort Ratio: 37.2

• 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: 1.7

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

Read more about these Key Performance Indicators...

Summary Analysis of the Design Ratios for the Allied Seawind II

Download this eBook to make sure you buy wisely!

1. A Sail Area/Displacement Ratio of just 13.6 suggests that the Allied Seawind II 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 38.9 means that a long-keel sailboat like the Allied Seawind II is likely to benefit from being reefed early to keep her sailing upright in a moderate breeze.

3. A Displacement/Length Ratio of 401, tells us the Allied Seawind II is firmly in the ultra-heavy displacement category. Load her up as much as you like and her performance will be hardly affected, not that it was ever startling. Few if any sailboats are built to this displacement category these days - but they remain popular with some long-distance sailors.

4. Ted Brewer's Comfort Ratio of 37.2 suggests that crew comfort of a Allied Seawind II 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 1.7 indicates that a Allied Seawind II would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.