The Dehler 43 CWS Sailboat
Specs & Key Performance Indicators

Published Specification for the Dehler 43 CWS

Underwater Profile: Bulb fin keel & spade rudder

Hull Material: GRP (Fibreglass)

Length Overall: 43'4" (13.2m)

Waterline Length: 34'9" (10.6m)

Beam: 12'9" (3.9m)

Draft: 6'9" (2.1m)

Rig Type: Fractional sloop

Displacement: 19,180lb (8,700kg)

Ballast: 8,377lb (3,800kg)

Designer: E. G. Van de Stadt

Builder: Dehler Yachts (Germany)

Year First Built: 1985

Published Design Ratios for the Dehler 43 CWS

1. Sail Area/Displacement Ratio: 22.2

• 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: 43.7

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

3. Displacement/Length Ratio: 204

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

4. Comfort Ratio: 26.6

• 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 Dehler 43 CWS

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1. A Sail Area/Displacement Ratio of 22.2 suggests that, in the right hands, the Dehler 43 CWS will have enough performance to leave most other sailboats of similar waterline length well astern. 

2. A Ballast/Displacement Ratio of 43.7 means that the Dehler 43 CWS will stand up well to her canvas in a blow, helping her to power through the waves.

3. A Displacement/Length Ratio of 204, tells us the Dehler 43 CWS 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 26.6 suggests that crew comfort of a Dehler 43 CWS in a seaway is similar to what you would associate with the motion of a coastal cruiser with moderate stability, which is not the best of news for anyone prone to seasickness. 

5. The Capsize Screening Formula (CSF) of 1.9 indicates that a Dehler 43 CWS would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.