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Review of Dehler 34 (2016)




Basic specs.

sail specifications
The Dehler 34 (2016) aka Dehler 34 Mk III is a sailboat designed by the German maritime architect bureau judel / vrolijk & co - engineering GmbH in the mid 2010. The Dehler 34 (2016) is built by the German yard Dehler Yachtbau GmbH.

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Hull

Both the hull and the deck is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.
The hull is a double hull which improves the indoor climate. Especially when the water is colder than the air in the cabin, then the double hull insulates against cold water and reduce the condense water in the cabin.
The deck is a double deck which improves the indoor climate.


Interior

The boat is equipped with 230.0 liter fresh water capacity.


Rig

The boat has more than one rig.

One option is a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a gennaker or a spinnaker for optimal speed.


Keel

The Dehler 34 (2016) has been built with different keel alternatives.

Unknown keel type

The keel is made of iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated.

Dehler 34 (2016) can only enter major marinas as the draft is about 1.95 - 2.05 meter (6.40 - 6.70 ft) dependent on the load. See immersion rate below.

Unknown keel type

This keel is also made of iron.

The boat can only enter major marinas as the draft is about 2.10 - 2.20 meter (6.89 - 7.19 ft) dependent on the load. See immersion rate below.

Unknown keel type

This keel is also made of iron.

The boat can enter most marinas as the draft is just about 1.55 - 1.65 meter (5.09 - 5.39 ft) dependent on the load. See immersion rate below.


Engine

The Dehler 34 (2016) has been equipped with different engine alternatives.

Alternative 1:

Dehler 34 (2016) may be equipped with an inboard Volvo Penta D1-30 diesel engine at 27 hp (20 kW). Calculated max speed is about 6.0 knots

The transmission is a saildrive.

Alternative 2:

The boat may be equipped with an inboard Volvo Penta D1-20 diesel engine at 18 hp (13 kW). Calculated max speed is about 4.9 knots

The transmission is a saildrive.

The fuel tank has a capacity of 160.0 liters (42 US gallons, 35 imperial gallons).


Sailing characteristics

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

Stability and Safety

What is Capsize Screening Formula (CSF)?

The capsize screening value for Dehler 34 (2016) is 2.00, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.


EU classification

Dehler 34 (2016) holds a CE certification:

The boat is by European Union certified as Class A. OCEAN:
Designed for extended voyages where conditions may exceed wind force 8 (Beaufort scale) and significant wave heights of 4 m and above but excluding abnormal conditions, and vessels largely self-sufficient.


Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 7.5 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.


Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Dehler 34 (2016) is about 231 kg/cm, alternatively 1296 lbs/inch.
Meaning: if you load 231 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1296 lbs cargo on the boat it will sink 1 inch.


Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Dehler 34 (2016) is 23.5.

Low High 38% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 38% of all similar sailboat designs. This comfort value is just below average.


L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Dehler 34 (2016) is 2.86.

Slim Wide 82% 0 50 100
Compared with other similar sailboats it is more spacy than 82% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.


Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Dehler 34 (2016) is 35%.

Low High 24% 0 50 100
This ballast ratio shows a righting moment that is higher than 24% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly below average.


D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Dehler 34 (2016) is 189 which categorizes this boat among 'light racers'.

Heavy Light 76% 0 50 100
76% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.


SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for Dehler 34 (2016) with ISO 8666 reference sail is 18.2, with a 135% genua the SA/D is 21.0.

Low High 69% 0 50 100
The SA/D ratio indicates that it is faster than 69% of all similar sailboat designs in light wind.


Over- / underrigged

Low High 69% 0 50 100
The Dehler 34 (2016) has more rig than 69% of all similar sailboats, which indicates that the boat is slightly overrigged.


Maintenance

Bottom Paint

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 40m2 (430 ft2).
Based on this, your favourite maritime shop can tell you the quantity you need.

Note: If you use a paint roller you will need more paint than if you use a paintbrush.


Rig

Dimensions of sail for fractional rig.

mainsail specifications headsail specifications

Are your sails worn out? You might find your next sail here: Sails for Sale



If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.



Guiding dimensions of running rig
Fractional rig
UsageLengthDiameter
Mainsail halyard 34.4 m(112.9 feet)10 mm(3/8 inch)
Jib/genoa halyard34.4 m(112.9 feet)10 mm(3/8 inch)
Spinnaker halyard34.4 m(112.9 feet)10 mm(3/8 inch)
Jib sheet 10.3 m(33.8 feet)12 mm(1/2 inch)
Genoa sheet10.3 m(33.8 feet)12 mm(1/2 inch)
Mainsheet 25.8 m(84.5 feet)12 mm(1/2 inch)
Spinnaker sheet22.7 m(74.3 feet)12 mm(1/2 inch)
Cunningham5.0 m(16.2 feet)10 mm(3/8 inch)
Kickingstrap9.9 m(32.5 feet)10 mm(3/8 inch)
Clew-outhaul9.9 m(32.5 feet)10 mm(3/8 inch)
Fractional rig
UsageLengthDiameter
Mainsail halyard 36.3 m(119.1 feet)10 mm(3/8 inch)
Jib/genoa halyard36.3 m(119.1 feet)10 mm(3/8 inch)
Spinnaker halyard36.3 m(119.1 feet)10 mm(3/8 inch)
Jib sheet 10.3 m(33.8 feet)12 mm(1/2 inch)
Genoa sheet10.3 m(33.8 feet)12 mm(1/2 inch)
Mainsheet 25.8 m(84.5 feet)12 mm(1/2 inch)
Spinnaker sheet22.7 m(74.3 feet)12 mm(1/2 inch)
Cunningham5.0 m(16.2 feet)10 mm(3/8 inch)
Kickingstrap9.9 m(32.5 feet)10 mm(3/8 inch)
Clew-outhaul9.9 m(32.5 feet)10 mm(3/8 inch)

Boat owner's ideas

This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.



Finally

We are always looking for new photos. If you can contribute with photos for Dehler 34 (J/V) it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.



References