Review of Amigo 23

Amigo 23
Amigo 23 anno 1976.

Basic specs.

sail specifications
The Amigo 23 is a small sailboat designed by the Swedish maritime architect Carl Andersson in the early seventies. Several hundred boats have been produced. The Amigo 23 is built by the Swedish yard Arksunds Båtbyggeri.

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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. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.


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 Amigo 23 is equipped with a long keel. A long keel provide a better directional stability than a similar boat with a fin keel; on the other hand, better directional stability means also that the boat is more difficult to handle in a harbour with less space.

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.

The boat can enter even shallow marinas as the draft is just about 1.12 - 1.22 meter (3.67 - 3.97 ft) dependent on the load. See immersion rate below.


The boat is typically equipped with an inboard Vire 7 engine at 7.0 hp (5 kW), which gives a max speed about 4.2 knots.

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 Amigo 23 is 1.91, 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 5.6 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 Amigo 23 is about 83 kg/cm, alternatively 465 lbs/inch.
Meaning: if you load 83 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 465 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 Amigo 23 is 21.6.

Low High 92% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 92% of all similar sailboat designs. This is a comfort value significantly above average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Amigo 23 is 2.96.

Wide Slim 62% 0 50 100
Compared with other similar sailboats it is slimmer than 62% 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 Amigo 23 is 44%.

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 Amigo 23 is 318 which categorizes this boat among 'medium weight cruisers'.

Heavy Light 7% 0 50 100
7% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Amigo 23 with ISO 8666 reference sail is 13.2, with a 135% genua the SA/D is 15.1.

Low High 15% 0 50 100
The SA/D ratio indicates that it is faster than 15% of all similar sailboat designs in light wind.

Over- / underrigged

Low High 27% 0 50 100
The Amigo 23 has more rig than 27% of all similar sailboats, which indicates that the boat is slightly underrigged.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Amigo 23 is 8

Slow Fast 8% 0 50 100
The relative speed performance is 8 which means that a it is faster than 8% 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 9m2 (96 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 19.9 m(65.4 feet)8 mm(5/16 inch)
Jib/genoa halyard19.9 m(65.4 feet)8 mm(5/16 inch)
Spinnaker halyard19.9 m(65.4 feet)8 mm(5/16 inch)
Jib sheet 6.8 m(22.3 feet)10 mm(3/8 inch)
Genoa sheet6.8 m(22.3 feet)10 mm(3/8 inch)
Mainsheet 17.0 m(55.8 feet)10 mm(3/8 inch)
Spinnaker sheet15.0 m(49.1 feet)10 mm(3/8 inch)
Cunningham3.0 m(9.7 feet)8 mm(5/16 inch)
Kickingstrap5.9 m(19.4 feet)8 mm(5/16 inch)
Clew-outhaul5.9 m(19.4 feet)8 mm(5/16 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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