Review of Alpa 12.7
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 378.0 liter fresh water capacity.
Fin keel
The Alpa 12.7 is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full 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 2.08 - 2.18 meter (6.82 - 7.12 ft) dependent on the load. See immersion rate below.
Alpa 12.7 may be equipped with an inboard Lombardini diesel engine at 45 hp (33 kW). Calculated max speed is about 6.5 knots
The fuel tank has a capacity of 95.0 liters (25 US gallons, 20 imperial gallons).
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 Alpa 12.7 is 1.75, 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 7.3 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 Alpa 12.7 is about 212 kg/cm, alternatively 1190 lbs/inch.
Meaning: if you load 212 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1190 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 Alpa 12.7 is 31.6.
What is L/B (Length Beam Ratio)?
The l/b ratio for Alpa 12.7 is 3.64.
What is Displacement Length Ratio?
The DL-ratio for Alpa 12.7 is 293 which categorizes this boat among 'medium weight 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 38m2 (409 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 | 12.7 m | (41.5 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 12.7 m | (41.5 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 31.6 m | (103.8 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 27.8 m | (91.3 feet) | 14 mm | (0.55 inch) |
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