Review of Dehler 45

Basic specs.

sail specifications
The Dehler 45 is a large sailboat designed by the Dutch maritime architect bureau Simonis Voogd Design.

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

The boat is equipped with 6 berths.

The boat 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 genaker or a spinnaker for optimal speed.


The Dehler 45 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.

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.

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 45 is 1.79, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

EU classification

Dehler 45 holds one 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 8.4 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 45 is about 310 kg/cm, alternatively 1736 lbs/inch.
Meaning: if you load 310 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1736 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 45 is 28.9.

Low High 34% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 34% 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 45 is 3.55.

Wide Slim 66% 0 50 100
Compared with other similar sailboats it is slimmer than 66% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Dehler 45 is 36%.

Low High 46% 0 50 100
This ballast ratio shows a righting moment that is higher than 46% of all similar sailboat designs. A righting moment (ability to resist heeling) just below average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Dehler 45 is 166 which categorizes this boat among 'light racers'.

Heavy Light 79% 0 50 100
79% 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 45 with ISO 8666 reference sail is 20.8, with a 135% genua the SA/D is 24.0.

Low High 88% 0 50 100
The SA/D ratio indicates that it is faster than 88% of all similar sailboat designs in light wind.

Over- / underrigged

Low High 76% 0 50 100
The Dehler 45 has more rig than 76% of all similar sailboats, which indicates that the boat is significantly overrigged.


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 54m2 (581 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.


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
Mainsail halyard 44.8 m(147.0 feet)14 mm(0.55 inch)
Jib/genoa halyard44.8 m(147.0 feet)14 mm(0.55 inch)
Spinnaker halyard44.8 m(147.0 feet)14 mm(0.55 inch)
Jib sheet 13.7 m(44.9 feet)16 mm(5/8 inch)
Genoa sheet13.7 m(44.9 feet)16 mm(5/8 inch)
Mainsheet 34.2 m(112.4 feet)16 mm(5/8 inch)
Spinnaker sheet30.1 m(98.9 feet)16 mm(5/8 inch)
Cunningham6.2 m(20.2 feet)14 mm(0.55 inch)
Kickingstrap12.3 m(40.4 feet)14 mm(0.55 inch)
Clew-outhaul12.3 m(40.4 feet)14 mm(0.55 inch)

Boat owner's ideas

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

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