Review of First Class 12
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 First Class 12 is 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 gennaker or a spinnaker for optimal speed.
Fin keel
The First Class 12 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.
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 2.10 - 2.20 meter (6.89 - 7.19 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 Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 7.9 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 First Class 12 is about 268 kg/cm, alternatively 1504 lbs/inch.
Meaning: if you load 268 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1504 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 Class 12 is 3.15.
The ballast ratio for First Class 12 is 44%.
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 47m2 (505 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.
Dimensions of sail for fractional rig.
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.
| Usage | Length | Diameter | ||
| Mainsail halyard | 38.3 m | (125.8 feet) | 12 mm | (1/2 inch) |
| Jib/genoa halyard | 38.3 m | (125.8 feet) | 12 mm | (1/2 inch) |
| Spinnaker halyard | 38.3 m | (125.8 feet) | 12 mm | (1/2 inch) |
| Jib sheet | 12.0 m | (39.3 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 12.0 m | (39.3 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 29.9 m | (98.2 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 26.3 m | (86.4 feet) | 14 mm | (0.55 inch) |
| Cunningham | 5.6 m | (18.4 feet) | 12 mm | (1/2 inch) |
| Kickingstrap | 11.2 m | (36.7 feet) | 12 mm | (1/2 inch) |
| Clew-outhaul | 11.2 m | (36.7 feet) | 12 mm | (1/2 inch) |
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