The Hanse 531 Sailboat
Specs & Key Performance Indicators

Published Specification for the Hanse 531

Underwater Profile: Bulb fin keel & spade rudder

Hull Material: GRP (Fibreglass)

Length Overall: 53'2" (16.2m)

Waterline Length: 47'9" (14.6m)

Beam: 16'2" (4.9m)

Draft: 9'11" (2.8m)

Rig Type: Fractional sloop

Displacement: 41,888lb (19,000kg)

Designer: Judel/Vrolijk

Builder: Hanse Yachts (Germany)

Year First Built: 2003

Year Last Built: 2007

Published Design Ratios for the Hanse 531

1. Sail Area/Displacement Ratio: 19.1

• 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: 34.7

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

3. Displacement/Length Ratio: 172

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

4. Comfort Ratio: 32.3

• 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

read more about these Key Performance Indicators...

Summary Analysis of the Design Ratios for the Hanse 531

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1. A Sail Area/Displacement Ratio of 19.1 suggests that the Hanse 531 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 34.7 would usually mean that the Hanse 531 would have a tendency to heel uncomfortably in a gust, and need to be reefed early to keep her sailing upright in a moderate breeze.

However, as she has much of her ballast concentrated in a bulb at the foot of her keel, she's likely to be considerably stiffer than her published Ballast/Displacement Ratio might suggest.

3. A Displacement/Length Ratio of 172, tells us the Hanse 531 is clearly a light displacement sailboat. If she's loaded with too much heavy cruising gear her performance will suffer to a degree.

4. Ted Brewer's Comfort Ratio of 32.3 suggests that crew comfort of a Hanse 531 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 Hanse 531 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.