Review of First Class 7.5
Basic specs.
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Both the hull and the deck is made of fibreglass. A hull made of fibreglass requires only a minimum of maintenance during the sailing season.
The First Class 7.5 has been built with different keel alternatives.
Fin keel with bulb
One option is 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 advantage of the bulb is that it lowers the center of gravity which resists heeling and reduces the draft.
Swing keel
Another option is 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 0.90 - 1.00 meter (2.95 - 3.25 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.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for First Class 7.5 is about 127 kg/cm, alternatively 713 lbs/inch.
Meaning: if you load 127 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 713 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 7.5 is 2.95.
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 | 7.5 m | (24.6 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 7.5 m | (24.6 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 18.7 m | (61.4 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 16.5 m | (54.1 feet) | 10 mm | (3/8 inch) |
Keels with moving parts need to be inspected and maintained on a regular basis according to advice given in owner's manual. Manufacturers usually advise which maintenance work can be done by the owner and which work should be carried out by a suitably experienced boatyard.
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