Review of Achilles 24

Basic specs.

sail specifications
The Achilles 24 is a sailboat designed by the maritime architect Oliver J. Lee together with Chris Butler in the late sixties. Several hundred boats have been produced. The Achilles 24 is built by the British yard Butler Moldings Ltd..

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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. 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 is equipped with 4 berths, a galley and toilet facility.


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 boat can enter even shallow marinas as the draft is just about 1.07 - 1.17 meter (3.51 - 3.81 ft) dependent on the load. See immersion rate below.


Achilles 24 is typically equipped with an 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 Achilles 24 is 2.04, indicating that this boat would not 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 5.9 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 Achilles 24 is about 85 kg/cm, alternatively 476 lbs/inch.
Meaning: if you load 85 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 476 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 Achilles 24 is 14.3.

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 Achilles 24 is 3.40.

Wide Slim 93% 0 50 100
Compared with other similar sailboats it is slimmer than 93% 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 Achilles 24 is 50%.

Low High 88% 0 50 100
This ballast ratio shows a righting moment that is higher than 88% 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 Achilles 24 is 156 which categorizes this boat among 'light racers'.

Heavy Light 76% 0 50 100
76% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Achilles 24 is 34

Slow Fast 34% 0 50 100
The relative speed performance is 34 which means that a it is faster than 34% 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 14m2 (150 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.


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
Jib sheet 7.3 m(23.9 feet)10 mm(3/8 inch)
Genoa sheet7.3 m(23.9 feet)10 mm(3/8 inch)
Mainsheet 18.2 m(59.6 feet)10 mm(3/8 inch)
Spinnaker sheet16.0 m(52.5 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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