Review of Sigma 41

Basic specs.

The Sigma 41 is a large sailboat designed by the British maritime architect David Thomas.

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Hull

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

Interior

The boat is equipped with 9 berths.

Engine

The boat is typically equipped with a diesel engine at 27.0 kW (36 hp).

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 Sigma 41 is 1.97, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Sigma 41 is about 329 kg/cm, alternatively 1843 lbs/inch.
Meaning: if you load 329 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1843 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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Sigma 41 is 3.18.

Compared with other similar sailboats it is more spacy than 66% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

Maintenance

Rig

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**
Usage	Length		Diameter
Jib sheet	12.5 m	(41.0 feet)	14 mm	(0.55 inch)
Genoa sheet	12.5 m	(41.0 feet)	14 mm	(0.55 inch)
Mainsheet	31.2 m	(102.5 feet)	14 mm	(0.55 inch)
Spinnaker sheet	27.5 m	(90.2 feet)	14 mm	(0.55 inch)

Boat owner's ideas

This section is reserved boat owner's changes, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

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Finally

We are always looking for new photos. If you can contribute with photos for Sigma 41 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.

References

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.