Review of Bénéteau 405

Basic specs.

The Bénéteau 405 is a large sailboat. The Bénéteau 405 is built by the French yard Bénéteau.

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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.

Keel

The boat can only enter major marinas as the draft is about 2.19 - 2.29 meter (7.19 - 7.49 ft) dependent on the load. See immersion rate below.

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.

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 Bénéteau 405 is about 280 kg/cm, alternatively 1571 lbs/inch.
Meaning: if you load 280 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1571 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 Bénéteau 405 is 3.20.

Compared with other similar sailboats it is more spacy than 62% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

Over- / underrigged

The Bénéteau 405 has more rig than 46% of all similar sailboats, which indicates that the boat is slightly underrigged.

Maintenance

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 49m² (527 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.

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	36.5 m	(119.8 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	36.5 m	(119.8 feet)	12 mm	(1/2 inch)
Spinnaker halyard	36.5 m	(119.8 feet)	12 mm	(1/2 inch)
Jib sheet	12.4 m	(40.6 feet)	14 mm	(0.55 inch)
Genoa sheet	12.4 m	(40.6 feet)	14 mm	(0.55 inch)
Mainsheet	30.9 m	(101.5 feet)	14 mm	(0.55 inch)
Spinnaker sheet	27.2 m	(89.3 feet)	14 mm	(0.55 inch)
Cunningham	4.6 m	(15.0 feet)	12 mm	(1/2 inch)
Kickingstrap	9.1 m	(30.0 feet)	12 mm	(1/2 inch)
Clew-outhaul	9.1 m	(30.0 feet)	12 mm	(1/2 inch)

Boat owner's ideas

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.

Finally

We are always looking for new photos. If you can contribute with photos for Bénéteau 405 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.