Review of Open 570

Basic specs.

The Open 570 is a small sailboat designed by the French maritime architect bureau Groupe Finot in the early 2000. The Open 570 is built by the French yard Philéas Boats.

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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.

Rig

The boat equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a genaker or a spinnaker for optimal speed.

Keel

The boat can enter even shallow marinas as the draft is just about 0.95 - 1.05 meter (3.12 - 3.42 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.

Stability and Safety

What is Capsize Screening Formula (CSF)?

The capsize screening value for Open 570 is 3.21, indicating that this boat would not 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 Open 570 is about 97 kg/cm, alternatively 545 lbs/inch.
Meaning: if you load 97 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 545 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 570 is 2.25.

Compared with other similar sailboats it is more spacy than 90% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Open 570 with ISO 8666 reference sail is 30.8, with a 135% genua the SA/D is 34.9.

The SA/D ratio indicates that it is faster than 100% of all similar sailboat designs in light wind.

Maintenance

Rig

Dimensions of sail for fractional rig.

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	20.6 m	(67.6 feet)	6 mm	(1/4 inch)
Jib/genoa halyard	20.6 m	(67.6 feet)	6 mm	(1/4 inch)
Spinnaker halyard	20.6 m	(67.6 feet)	6 mm	(1/4 inch)
Jib sheet	5.7 m	(18.8 feet)	8 mm	(5/16 inch)
Genoa sheet	5.7 m	(18.8 feet)	8 mm	(5/16 inch)
Mainsheet	14.3 m	(46.9 feet)	8 mm	(5/16 inch)
Spinnaker sheet	12.6 m	(41.3 feet)	8 mm	(5/16 inch)
Cunningham	3.1 m	(10.2 feet)	6 mm	(1/4 inch)
Kickingstrap	6.2 m	(20.5 feet)	6 mm	(1/4 inch)
Clew-outhaul	6.2 m	(20.5 feet)	6 mm	(1/4 inch)

Boat owner's ideas

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

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Finally

We are always looking for new photos. If you can contribute with photos for Open 570 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.