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Review of Seguin 40


Basic specs.

sail specifications
The Seguin 40 is a large sailboat designed by the maritime architect Craig V. Walters in the mid eighties. The Seguin 40 is built by the American yard Lyman Morse Boatbuilding.

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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.

Keel

The boat can enter even shallow marinas as the draft is just about 0.76 - 0.86 meter (2.49 - 2.79 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 Seguin 40 is 1.89, 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 7.5 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 Seguin 40 is about 236 kg/cm, alternatively 1326 lbs/inch.
Meaning: if you load 236 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1326 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 Seguin 40 is 28.0.

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 Seguin 40 is 3.26.

Slim Wide 54% 0 50 100
Compared with other similar sailboats it is more spacy than 54% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.


D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Seguin 40 is 251 which categorizes this boat among 'light crusers & offshore racers'.

Heavy Light 50% 0 50 100
50% of all similar sailboat designs are categorized as heavier. This boat has a precise average ratio between displacement and length!


SA/D (Sail Area Displacement ratio)

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

The SA/D for Seguin 40 with ISO 8666 reference sail is 17.9, with a 135% genua the SA/D is 21.3.

Low High 54% 0 50 100
The SA/D ratio indicates that it is faster than 54% of all similar sailboat designs in light wind.


Over- / underrigged

Low High 24% 0 50 100
The Seguin 40 has more rig than 24% of all similar sailboats, which indicates that the boat is significantly 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 42m2 (452 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 36.5 m(119.8 feet)12 mm(1/2 inch)
Jib/genoa halyard36.5 m(119.8 feet)12 mm(1/2 inch)
Spinnaker halyard36.5 m(119.8 feet)12 mm(1/2 inch)
Jib sheet 12.1 m(39.7 feet)14 mm(0.55 inch)
Genoa sheet12.1 m(39.7 feet)14 mm(0.55 inch)
Mainsheet 30.2 m(99.2 feet)14 mm(0.55 inch)
Spinnaker sheet26.6 m(87.3 feet)14 mm(0.55 inch)
Cunningham4.4 m(14.5 feet)12 mm(1/2 inch)
Kickingstrap8.8 m(29.0 feet)12 mm(1/2 inch)
Clew-outhaul8.8 m(29.0 feet)12 mm(1/2 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 Seguin 40 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