Review of Centerline 40

Basic specs.

sail specifications
The Centerline 40 is a large sailboat.

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

The boat is equipped with 4 cabins, 6 berths and a galley.

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.


The boat can only enter major marinas as the draft is about 2.00 - 2.10 meter (6.56 - 6.86 ft) dependent on the load. See immersion rate below.

Centerline 40 is typically equipped with an inboard Volvo Penta engine at 29.0 hp (21 kW), which gives a max speed about 6.6 knots.
The transmission is a saildrive.

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 Centerline 40 is 1.98, 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 8.4 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 Centerline 40 is about 292 kg/cm, alternatively 1638 lbs/inch.
Meaning: if you load 292 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1638 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 Centerline 40 is 20.4.

Low High 12% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 12% 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 Centerline 40 is 3.30.

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

D/L (Displacement Length Ratio)
What is Displacement Length Ratio?
The DL-ratio for Centerline 40 is 107 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.


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 51m2 (548 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.

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
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)

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