The Dehler 34 Sailboat
Specs & Key Performance Indicators

Published Specification for the Dehler 34

Underwater Profile: Fin keel with spade rudder

Hull Material: GRP (Fibreglass)

Length Overall: 33'2" / 10.1m

Waterline Length: 27'3" / 8.3m

Beam: 11'3" / 3.4m 

Draft: 5'9" / 1.8m

Rig Type: Fractional rigged sloop

Displacement: 8,818lb / 4,000kg

Designer: E G Van de Stadt

Builder: Dehler Yachts (Germany)

Year First Built: 1983

Published Design Ratios for the Dehler 34

1. Sail Area/Displacement Ratio: 18.5

• 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: 45.0

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

3. Displacement/Length Ratio: 195

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

4. Comfort Ratio: 18.9

• 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: 2.16

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

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Summary Analysis of the Design Ratios for the Dehler 34

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1. A Sail Area/Displacement Ratio of 18.5 suggests that the Dehler 34 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 45.0 means that the Dehler 34 will stand up well to her canvas in a blow, helping her to power through the waves.

3. A Displacement/Length Ratio of 195, tells us the Dehler 34 is clearly a light displacement sailboat. If she's loaded with too much heavy cruising gear her performance will suffer dramatically.

4. Ted Brewer's Comfort Ratio of 18.9 suggests that the Dehler 34 will have the motion underway to that of a lightweight racing boat. Crew comfort will often be memorable for all the wrong reasons. Upwind in lively conditions the Dehler 34 will be tender and slam enough to shake your fillings out with a motion that most cruising sailors have no desire to get used to.

5. The Capsize Screening Formula of 2.2 tells us that a Dehler 34 would not be a good choice of sailboat for ocean passage-making, owing to the increased risk of capsize in strong winds and heavy seas when compared to a similar sailboat with a CSF of less than 2.0.