The Dehler 39 CWS Sailboat
Specs & Key Performance Indicators

Published Specification for the Dehler 39 CWS

Underwater Profile: Bulb fin keel & spade rudder

Hull Material: GRP (Fibreglass)

Length Overall: 38'11" (11.9m)

Waterline Length: 30'2" (9.2m)

Beam: 10'10" (3.3m)

Draft: 6'2" (1.9m)

Rig Type: Fractional sloop

Displacement: 11,246lb (5,101kg)

Designer: E. G. Van de Stadt

Builder: Dehler Yachts (Germany)

Year First Built: 1988

Published Design Ratios for the Dehler 39 CWS

1. Sail Area/Displacement Ratio: 18.8

• 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: Not published

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

3. Displacement/Length Ratio: 182

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

4. Comfort Ratio: 22.2

• 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: 1.94

• 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 39 CWS

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1. A Sail Area/Displacement Ratio of 18.8 suggests that the Dehler 39 CWS will, in the right conditions, approach her maximum hull speed readily and satisfy the sailing performance expectations of most cruising sailors.

2. In the absence of any published ballast weight, we are unable to calculate the Ballast/Displacement Ratio for the Dehler 39 CWS.

3. A Displacement/Length Ratio of 182, tells us the Dehler 39 CWS 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 22.2 suggests that crew comfort of a Dehler 39 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 1.94 indicates that a Dehler 39 CWS would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.