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Review of CSY 51


Basic specs.

sail specifications
The CSY 51 is a large sailboat designed by the Dutch maritime architect Johannes Valentijn in the mid eighties.

Here we would have liked to show you nice photos of the CSY 51.
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Looking for a new boat? Find a CSY 51 or similar boat for sale

Hull
The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.

Rig
The boat 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

The CSY 51 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 long keel.But be aware that even though a Wing Keel keel is very good for speed racing, a fishing nets and the like in the water can easily make you into a troublesome situation.

The boat can enter most marinas as the draft is just about 1.68 - 1.78 meter (5.51 - 5.81 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 CSY 51 is 1.83, 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 8.7 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 CSY 51 is about 394 kg/cm, alternatively 2208 lbs/inch.
Meaning: if you load 394 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 2208 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 CSY 51 is 32.5.

Low High 42% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 42% of all similar sailboat designs. This comfort value is just below average.


L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for CSY 51 is 3.40.

Slim Wide 66% 0 50 100
Compared with other similar sailboats it is more spacy than 66% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.


Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for CSY 51 is 47%.

Low High 95% 0 50 100
This ballast ratio shows a righting moment that is higher than 95% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.


D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for CSY 51 is 206 which categorizes this boat among 'light crusers & offshore racers'.

Heavy Light 58% 0 50 100
58% 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 CSY 51 with ISO 8666 reference sail is 16.1, with a 135% genua the SA/D is 19.4.

Low High 10% 0 50 100
The SA/D ratio indicates that it is faster than 10% 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 60m2 (645 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.

mainsail specifications headsail specifications

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
UsageLengthDiameter
Mainsail halyard 39.8 m(130.5 feet)14 mm(0.55 inch)
Jib/genoa halyard39.8 m(130.5 feet)14 mm(0.55 inch)
Spinnaker halyard39.8 m(130.5 feet)14 mm(0.55 inch)
Jib sheet 15.5 m(51.0 feet)16 mm(5/8 inch)
Genoa sheet15.5 m(51.0 feet)16 mm(5/8 inch)
Mainsheet 38.8 m(127.5 feet)16 mm(5/8 inch)
Spinnaker sheet34.2 m(112.2 feet)16 mm(5/8 inch)
Cunningham5.5 m(18.0 feet)14 mm(0.55 inch)
Kickingstrap11.0 m(36.0 feet)14 mm(0.55 inch)
Clew-outhaul11.0 m(36.0 feet)14 mm(0.55 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 CSY 51 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