Review of Open 5.00

Basic specs.

The Open 5.00 is a small sailboat designed by the French maritime architect Finot in the early 2000.

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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. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

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 Open 5.00 is 3.41, indicating that this boat would not be accepted to participate in ocean races.

EU classification

Open 5.00 holds two CE certifications:

The boat is by European Union certified as Class C. INSHORE:

Designed for voyages in coastal waters, large bays, estuaries, lakes and rivers where conditions up to, and including, wind force 6 (Beaufort scale) and significant wave heights up to, and including, 2 m may be experienced.

The boat is by European Union certified as Class D. SHELTERED WATERS:

Designed for voyages on sheltered coastal waters, small bays, small lakes, rivers and canals when conditions up to, and including, wind force 4 (Beaufort scale) and significant wave heights up to, and including, 0,3 m may be experienced, with occasional waves of 0,5 m maximum height, for example from passing vessels.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Open 5.00 is about 75 kg/cm, alternatively 420 lbs/inch.
Meaning: if you load 75 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 420 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 Open 5.00 is 2.23.

Compared with other similar sailboats it is more spacy than 92% of all other designs. It seems that the designer has chosen a significantly 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	5.0 m	(16.4 feet)	8 mm	(5/16 inch)
Genoa sheet	5.0 m	(16.4 feet)	8 mm	(5/16 inch)
Mainsheet	12.5 m	(41.0 feet)	8 mm	(5/16 inch)
Spinnaker sheet	11.0 m	(36.1 feet)	8 mm	(5/16 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 Open 5.00 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.