Review of Dufour 560 Grand Large

Basic specs.

The Dufour 560 Grand Large is a large sailboat designed by the Italian maritime architect Umberto Felci in the mid 2010.

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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 3 cabins, 7 berths and 730.0 liter fresh water capacity.

Rig

The Dufour 560 Grand Large is equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.

Keel

Fin keel

The Dufour 560 Grand Large is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full keel.

The boat can only enter major marinas as the draft is about 2.50 - 2.60 meter (8.20 - 8.50 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 Dufour 560 Grand Large is 1.96, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 9.5 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 Dufour 560 Grand Large is about 513 kg/cm, alternatively 2874 lbs/inch.
Meaning: if you load 513 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 2874 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.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Dufour 560 Grand Large is 27.8.

Comparing this ratio with similar sailboats show that it is more comfortable than 24% of all similar sailboat designs. This is a comfort value significantly below average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Dufour 560 Grand Large is 3.23.

Compared with other similar sailboats it is more spacy than 86% 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 Dufour 560 Grand Large is 28%.

This ballast ratio shows a righting moment that is higher than 12% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly below average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Dufour 560 Grand Large is 140 which categorizes this boat among 'ultra light racers'.

82% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Dufour 560 Grand Large with ISO 8666 reference sail is 13.3, with a 135% genua the SA/D is 16.6.

The SA/D ratio indicates that it is faster than 1% of all similar sailboat designs in light wind.

Over- / 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 86m² (925 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 for masthead 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	51.3 m	(168.3 feet)	14 mm	(0.55 inch)
Jib/genoa halyard	51.3 m	(168.3 feet)	14 mm	(0.55 inch)
Spinnaker halyard	51.3 m	(168.3 feet)	14 mm	(0.55 inch)
Jib sheet	16.3 m	(53.5 feet)	16 mm	(5/8 inch)
Genoa sheet	16.3 m	(53.5 feet)	16 mm	(5/8 inch)
Mainsheet	40.8 m	(133.7 feet)	16 mm	(5/8 inch)
Spinnaker sheet	35.9 m	(117.7 feet)	16 mm	(5/8 inch)
Cunningham	2.5 m	(8.2 feet)	14 mm	(0.55 inch)
Kickingstrap	5.0 m	(16.4 feet)	14 mm	(0.55 inch)
Clew-outhaul	5.0 m	(16.4 feet)	14 mm	(0.55 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 Dufour 560 Grand Large 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.