Review of Ansa 42

Ansa 42
Ansa 42 anno 1982.

Basic specs.

sail specifications
The Ansa 42 is a large sailboat designed by the Swedish maritime architect Ocke Mannerfelt in the late seventies. Less than 100 boats have been produced. The Ansa 42 is built by the Swedish yard Ansa Sailing AB.

Looking for a new boat? Find a Ansa 42 or similar boat for sale


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

Floor plan
Floor plan of Ansa 42.
Interior of Ansa 42 anno 1982.


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 Ansa 42 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 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. As the surface of a fin type keel is just a fraction of the total wet surface, the difference between an iron keel and a lead keel can in reality be ignored for cruising yachts.

The boat can only enter major marinas as the draft is about 1.90 - 2.00 meter (6.23 - 6.53 ft) dependent on the load. See immersion rate below.


The boat is typically equipped with an inboard Volvo Penta MD11C 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 Ansa 42 is 1.72, 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 8.0 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 Ansa 42 is about 224 kg/cm, alternatively 1256 lbs/inch.
Meaning: if you load 224 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1256 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 Ansa 42 is 24.8.

Low High 24% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 24% 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 Ansa 42 is 4.10.

Wide Slim 99% 0 50 100
Compared with other similar sailboats it is slimmer than 99% of all other designs. It seems that the designer has chosen a significantly more speedy hull design. This type of design is also referred to as 'needle'.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Ansa 42 is 43%.

Low High 73% 0 50 100
This ballast ratio shows a righting moment that is higher than 73% of all similar sailboat designs. A righting moment (ability to resist heeling) just above average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Ansa 42 is 132 which categorizes this boat among 'ultra light racers'.

Heavy Light 92% 0 50 100
92% 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 Ansa 42 with ISO 8666 reference sail is 18.8, with a 135% genua the SA/D is 21.7.

Low High 73% 0 50 100
The SA/D ratio indicates that it is faster than 73% of all similar sailboat designs in light wind.

Over- / underrigged

Low High 79% 0 50 100
The Ansa 42 has more rig than 79% of all similar sailboats, which indicates that the boat is significantly overrigged.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Ansa 42 is 27

Slow Fast 27% 0 50 100
The relative speed performance is 27 which means that a it is faster than 27% of all similar sailboat designs.


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 41m2 (441 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 genoa specifications spinnaker 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 37.3 m(122.4 feet)12 mm(1/2 inch)
Jib/genoa halyard37.3 m(122.4 feet)12 mm(1/2 inch)
Spinnaker halyard37.3 m(122.4 feet)12 mm(1/2 inch)
Jib sheet 12.7 m(41.7 feet)14 mm(0.55 inch)
Genoa sheet12.7 m(41.7 feet)14 mm(0.55 inch)
Mainsheet 31.8 m(104.2 feet)14 mm(0.55 inch)
Spinnaker sheet27.9 m(91.7 feet)14 mm(0.55 inch)
Cunningham4.8 m(15.6 feet)12 mm(1/2 inch)
Kickingstrap9.5 m(31.2 feet)12 mm(1/2 inch)
Clew-outhaul9.5 m(31.2 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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