Review of First 47.7
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.
The boat is equipped with 6/8 berths.
The First 47.7 has been built with different keel alternatives.
Unknown keel type
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.
Fin keel
The First 47.7 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.
First 47.7 can only enter major marinas as the draft is about 2.31 - 2.41 meter (7.58 - 7.88 ft) dependent on the load. See immersion rate below.
The First 47.7 has been equipped with different engine alternatives.
Alternative 1:
The boat may be equipped with an inboard Yanmar 4JH3-TE diesel engine at 75 hp (55 kW).
Alternative 2:
The boat may be equipped with an engine at 56 hp (41 kW)..
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 First 47.7 is 2.00, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for First 47.7 is about 437 kg/cm, alternatively 2448 lbs/inch.
Meaning: if you load 437 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 2448 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 L/B (Length Beam Ratio)?
The l/b ratio for First 47.7 is 3.22.
The ballast ratio for First 47.7 is 33%.
Maintenance
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 | 14.5 m | (47.6 feet) | 16 mm | (5/8 inch) |
| Genoa sheet | 14.5 m | (47.6 feet) | 16 mm | (5/8 inch) |
| Mainsheet | 36.2 m | (118.9 feet) | 16 mm | (5/8 inch) |
| Spinnaker sheet | 31.9 m | (104.7 feet) | 16 mm | (5/8 inch) |
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