Review of Block Island 40 Mk III
Basic specs.
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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.
CentreBoard
The Block Island 40 Mk III is equipped with a centreboard keel. A centreboard keel is a pivoting lifting keel, allowing to sail both coastal and inland waters.
The boat can enter even shallow marinas as the draft is just about 1.28 - 1.38 meter (4.20 - 4.50 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.
What is Capsize Screening Formula (CSF)?
The capsize screening value for Block Island 40 Mk III is 1.62, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 7.2 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.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for Block Island 40 Mk III is about 200 kg/cm, alternatively 1121 lbs/inch.
Meaning: if you load 200 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1121 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.
What is Motion Comfort Ratio (MCR)?
The Motion Comfort Ratio for Block Island 40 Mk III is 38.5.
What is L/B (Length Beam Ratio)?
The l/b ratio for Block Island 40 Mk III is 3.71.
The ballast ratio for Block Island 40 Mk III is 39%.
What is Displacement Length Ratio?
The DL-ratio for Block Island 40 Mk III is 356 which categorizes this boat among 'heavy cruisers'.
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 40m2 (430 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.
| Usage | Length | Diameter | ||
|---|---|---|---|---|
| Jib sheet | 12.4 m | (40.7 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 12.4 m | (40.7 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 31.1 m | (101.9 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 27.3 m | (89.6 feet) | 14 mm | (0.55 inch) |
This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.
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