Review of First 21.7 S
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. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.
The boat is equipped with 35.0 liter fresh water capacity.
Swing keel
The First 21.7 S is equipped with a swing keel. A swing 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 0.70 - 0.80 meter (2.30 - 2.60 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 First 21.7 S is 2.32, indicating that this boat would not 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 21.7 S is about 106 kg/cm, alternatively 595 lbs/inch.
Meaning: if you load 106 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 595 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 21.7 S is 2.52.
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 | 6.2 m | (20.5 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 6.2 m | (20.5 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 15.6 m | (51.3 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 13.8 m | (45.1 feet) | 10 mm | (3/8 inch) |
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