Review of Dehler 30 OD

Basic specs.

The Dehler 30 OD is a sailboat designed by the German maritime architect bureau judel / vrolijk & co - engineering GmbH in the late 2010.

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Hull

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.

Interior

The boat is equipped with 40.0 liter fresh water capacity.

Rig

The Dehler 30 OD is equipped with 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

Torpedo keel

But be aware that even though a T keel is very good for speed racing, a fishing nets and the like in the water can easily make you into a troublesome situation.

The boat can only enter major marinas as the draft is about 2.20 - 2.30 meter (7.22 - 7.52 ft) dependent on the load. See immersion rate below.

Engine

Dehler 30 OD may be equipped with an engine at 9 hp (6 kW). Calculated max speed is about 4.9 knots.

Note: SD = 'Stealth Drive' retracting concept, operated from cockpit.

The fuel tank has a capacity of 25.0 liters (6 US gallons, 5 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 30 OD is 2.33, indicating that this boat would not be accepted to participate in ocean races.

EU classification

Dehler 30 OD holds two CE certifications:

If less than 4 in on board 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.

If less than 6 in on board the boat is by European Union certified as Class B. OFFSHORE:

Designed for offshore voyages where conditions up to, and including, wind force 8 (Beaufort scale) and significant wave heights up to, and including, 4 m may be experienced.

Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 7.3 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 30 OD is about 195 kg/cm, alternatively 1093 lbs/inch.
Meaning: if you load 195 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1093 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 30 OD is 13.7.

Comparing this ratio with similar sailboats show that it is more comfortable than 8% of all similar sailboat designs. This is a comfort value significantly below average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Dehler 30 OD is 2.81.

Compared with other similar sailboats it is more spacy than 79% 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 30 OD is 34%.

This ballast ratio shows a righting moment that is higher than 15% 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 30 OD is 108 which categorizes this boat among 'ultra light racers'.

96% 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 30 OD with ISO 8666 reference sail is 24.8, with a 135% genua the SA/D is 29.3.

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

Over- / underrigged

The Dehler 30 OD has more rig than 98% of all similar sailboats, which indicates that the boat is significantly 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 37m² (398 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.

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**
Usage	Length		Diameter
Mainsail halyard	31.3 m	(102.7 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	31.3 m	(102.7 feet)	10 mm	(3/8 inch)
Spinnaker halyard	31.3 m	(102.7 feet)	10 mm	(3/8 inch)
Jib sheet	9.1 m	(30.0 feet)	12 mm	(1/2 inch)
Genoa sheet	9.1 m	(30.0 feet)	12 mm	(1/2 inch)
Mainsheet	22.9 m	(75.0 feet)	12 mm	(1/2 inch)
Spinnaker sheet	20.1 m	(66.0 feet)	12 mm	(1/2 inch)
Cunningham	3.9 m	(12.8 feet)	10 mm	(3/8 inch)
Kickingstrap	7.8 m	(25.6 feet)	10 mm	(3/8 inch)
Clew-outhaul	7.8 m	(25.6 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.

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Finally

We are always looking for new photos. If you can contribute with photos for Dehler 30 OD 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

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.