Review of Alc 40

Basic specs.

sail specifications
The Alc 40 is a large sailboat designed by the maritime architect Adolf LeComte in the early seventies. The Alc 40 is built by the Dutch yard LeComte-Holland, N.V..

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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 equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.


The Alc 40 is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a long keel.

The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.

The boat can enter most marinas as the draft is just about 1.75 - 1.85 meter (5.74 - 6.04 ft) dependent on the load. See immersion rate below.


The boat is typically equipped with a Westerbeke 4-107 diesel engine.

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 Alc 40 is 1.88, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 7.4 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 Alc 40 is about 219 kg/cm, alternatively 1227 lbs/inch.
Meaning: if you load 219 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1227 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 Alc 40 is 27.1.

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 Alc 40 is 3.38.

Wide Slim 58% 0 50 100
Compared with other similar sailboats it is slimmer than 58% 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 Alc 40 is 45%.

Low High 76% 0 50 100
This ballast ratio shows a righting moment that is higher than 76% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Alc 40 is 250 which categorizes this boat among 'light crusers & offshore racers'.

Heavy Light 50% 0 50 100
50% of all similar sailboat designs are categorized as heavier. This boat has a precise average ratio between displacement and length!

SA/D (Sail Area Displacement ratio)

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

The SA/D for Alc 40 with ISO 8666 reference sail is 15.4, with a 135% genua the SA/D is 18.7.

Low High 27% 0 50 100
The SA/D ratio indicates that it is faster than 27% of all similar sailboat designs in light wind.

Over- / underrigged

Low High 46% 0 50 100
The Alc 40 has more rig than 46% of all similar sailboats, which indicates that the boat is slightly underrigged.


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.


Dimensions of sail for masthead 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 32.4 m(106.3 feet)12 mm(1/2 inch)
Jib/genoa halyard32.4 m(106.3 feet)12 mm(1/2 inch)
Spinnaker halyard32.4 m(106.3 feet)12 mm(1/2 inch)
Jib sheet 12.1 m(39.5 feet)14 mm(0.55 inch)
Genoa sheet12.1 m(39.5 feet)14 mm(0.55 inch)
Mainsheet 30.1 m(98.8 feet)14 mm(0.55 inch)
Spinnaker sheet26.5 m(87.0 feet)14 mm(0.55 inch)
Cunningham3.5 m(11.5 feet)12 mm(1/2 inch)
Kickingstrap7.0 m(22.9 feet)12 mm(1/2 inch)
Clew-outhaul7.0 m(22.9 feet)12 mm(1/2 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.


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