Review of North Wind 40

Basic specs.

The North Wind 40 is a large sailboat designed by the British maritime architect Angus S. Primrose. The North Wind 40 is built by the German yard Spitzner Yacht-Vertrieb GmbH.

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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 6-10 berths.

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 North Wind 40 is 1.85, 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 North Wind 40 is about 300 kg/cm, alternatively 1682 lbs/inch.
Meaning: if you load 300 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1682 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 North Wind 40 is 3.21.

Compared with other similar sailboats it is more spacy than 58% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

SA/D (Sail Area Displacement ratio)

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

The SA/D for North Wind 40 with ISO 8666 reference sail is 17.8, with a 135% genua the SA/D is 21.2.

The SA/D ratio indicates that it is faster than 54% of all similar sailboat designs in light wind.

Maintenance

Rig

Dimensions of sail.

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**
Usage	Length		Diameter
Mainsail halyard	36.9 m	(121.2 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	36.9 m	(121.2 feet)	12 mm	(1/2 inch)
Spinnaker halyard	36.9 m	(121.2 feet)	12 mm	(1/2 inch)
Jib sheet	12.0 m	(39.3 feet)	14 mm	(0.55 inch)
Genoa sheet	12.0 m	(39.3 feet)	14 mm	(0.55 inch)
Mainsheet	30.0 m	(98.3 feet)	14 mm	(0.55 inch)
Spinnaker sheet	26.4 m	(86.5 feet)	14 mm	(0.55 inch)
Cunningham	4.6 m	(15.2 feet)	12 mm	(1/2 inch)
Kickingstrap	9.3 m	(30.4 feet)	12 mm	(1/2 inch)
Clew-outhaul	9.3 m	(30.4 feet)	12 mm	(1/2 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

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References

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