YachtDatabase.com

Review of Atlantic 50


Basic specs.

sail specifications
The Atlantic 50 is a large sailboat designed by the maritime architect Guy Ribadeau Dumas.

Here we would have liked to show you nice photos of the Atlantic 50.
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Keel

The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.

The boat can only enter major marinas as the draft is about 2.80 - 2.90 meter (9.19 - 9.49 ft) dependent on the load. See immersion rate below.


Engine

The boat is typically equipped with an engine.


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 Atlantic 50 is 2.03, indicating that this boat would not 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 9.1 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 Atlantic 50 is about 397 kg/cm, alternatively 2223 lbs/inch.
Meaning: if you load 397 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 2223 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 Atlantic 50 is 19.3.

Low High 5% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 5% 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 Atlantic 50 is 3.65.

Wide Slim 69% 0 50 100
Compared with other similar sailboats it is slimmer than 69% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.


Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Atlantic 50 is 25%.

Low High 7% 0 50 100
This ballast ratio shows a righting moment that is higher than 7% 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 Atlantic 50 is 86 which categorizes this boat among 'ultra light racers'.

Heavy Light 95% 0 50 100
95% 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 Atlantic 50 with ISO 8666 reference sail is 23.5, with a 135% genua the SA/D is 27.7.

Low High 96% 0 50 100
The SA/D ratio indicates that it is faster than 96% 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 74m2 (796 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.

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 42.3 m(138.8 feet)14 mm(0.55 inch)
Jib/genoa halyard42.3 m(138.8 feet)14 mm(0.55 inch)
Spinnaker halyard42.3 m(138.8 feet)14 mm(0.55 inch)
Jib sheet 15.2 m(50.0 feet)16 mm(5/8 inch)
Genoa sheet15.2 m(50.0 feet)16 mm(5/8 inch)
Mainsheet 38.1 m(125.1 feet)16 mm(5/8 inch)
Spinnaker sheet33.6 m(110.1 feet)16 mm(5/8 inch)
Cunningham6.0 m(19.6 feet)14 mm(0.55 inch)
Kickingstrap11.9 m(39.2 feet)14 mm(0.55 inch)
Clew-outhaul11.9 m(39.2 feet)14 mm(0.55 inch)

Boat owner's ideas

This section is reserved boat owner's changes, 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 Atlantic 50 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