The Valiant 47 Sailboat
Specs & Key Performance Indicators

Published Specification for the Valiant 47

Underwater Configuration: Fin keel with skeg-hung rudder

Hull Material: GRP (Fibreglass)

Length Overall: 47'0" (14.3m)

Waterline Length: 40'3" (12.3m)

Beam: 13'10" (4.2m)

Draft: 6'3" (1.9m)

Rig Type: Cutter

Displacement: 30,000lb (13,608kg)

Designer: Robert Perry

Builder: Valiant Yachts (USA)

Year First Built: 1981

Year Last Built: 1992

Number Built: 17

Published Design Ratios for the Valiant 47

1. Sail Area/Displacement Ratio: 17.7

• 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: 36.7

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

3. Displacement/Length Ratio: 205

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

4. Comfort Ratio: 33.2

• 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: 1.8

• 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 Valiant 47

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1. A Sail Area/Displacement Ratio of 17.7 suggests that the Valiant 47 will, in the right conditions, approach her maximum hull speed readily and satisfy the sailing performance expectations of most cruising sailors.

2. A Ballast/Displacement Ratio of 36.7 means that the Valiant 47 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 205, tells us the Valiant 47 is a moderate displacement cruiser, which means she'll carry all your cruising gear without it having a dramatic effect on her performance. Most of today's sailboats intended for offshore cruising fall into this displacement category.

4. Ted Brewer's Comfort Ratio of 33.2 suggests that crew comfort of a Valiant 47 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 1.8 tells us that a Valiant 47 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.