Review of Allures 51.9

Basic specs.

The Allures 51.9 is a large sailboat designed by the French maritime architect bureau Berret-Racoupeau Yacht Design together with Franck Darnet also from France in the early twenties.

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Hull

The hull is made of aluminium. Aluminum is strong and forgiving. Where an impact on a fiberglass hull will result in major gelcoat damage and possible cracking, an aluminum hull will probably only have a scratch or a small bend. The only concern is electrolysis. Ensure that you have proper sacrificial anodes installed.

Interior

The boat is equipped with 3 cabins, 5 berths, a galley, 600.0 liter fresh water capacity and toilet facility.

Keel

CentreBoard

The Allures 51.9 is equipped with a centreboard keel. A centreboard keel is a pivoting lifting keel, allowing to sail both coastal and inland waters.

The boat can enter even shallow marinas as the draft is just about 1.34 - 1.44 meter (4.40 - 4.70 ft) dependent on the load. See immersion rate below.

Engine

Allures 51.9 may be equipped with an inboard engine at 110 hp (81 kW).

The fuel tank has a capacity of 700.0 liters (184 US gallons, 153 imperial gallons).

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 Allures 51.9 is 1.84, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

EU classification

Allures 51.9 holds a CE certification:

The boat is by European Union certified as Class A. OCEAN:

Designed for extended voyages where conditions may exceed wind force 8 (Beaufort scale) and significant wave heights of 4 m and above but excluding abnormal conditions, and vessels largely self-sufficient.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Allures 51.9 is about 538 kg/cm, alternatively 3014 lbs/inch.
Meaning: if you load 538 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 3014 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 Allures 51.9 is 3.23.

Compared with other similar sailboats it is more spacy than 82% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Allures 51.9 is 30%.

This ballast ratio shows a righting moment that is higher than 21% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly below average.

SA/D (Sail Area Displacement ratio)

SA/D (Sail Area Displacement ratio)
Indicates how fast the boat is in light wind:
- Cruising Boats have ratios 10-15
- Cruiser-Racers have ratios 16-20
- Racers have ratios above 20
- High-Performance Racers have ratios above 24
Sail-area/displacement ratio (SA/D ratio): 17.30

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	15.6 m	(51.1 feet)	16 mm	(5/8 inch)
Genoa sheet	15.6 m	(51.1 feet)	16 mm	(5/8 inch)
Mainsheet	38.9 m	(127.7 feet)	16 mm	(5/8 inch)
Spinnaker sheet	34.3 m	(112.4 feet)	16 mm	(5/8 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.

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

Finally

We are always looking for new photos. If you can contribute with photos for Allures 51.9 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.