Review of Alpa 825
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 one cabin, 4 berths, 50.0 liter fresh water capacity and toilet facility.
The Alpa 825 is equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.
Fin keel
The Alpa 825 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 boat can enter most marinas as the draft is just about 1.60 - 1.70 meter (5.25 - 5.55 ft) dependent on the load. See immersion rate below.
Alpa 825 may be equipped with an inboard Vetus engine at 16 hp (11 kW).
The transmission is a shaft drive. A shaft drive will in the long run require less maintenance than other types of drive e.g. a sail drive.
The fuel tank has a capacity of 100.0 liters (26 US gallons, 21 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 825 is 1.68, 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 Alpa 825 is about 132 kg/cm, alternatively 742 lbs/inch.
Meaning: if you load 132 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 742 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 Alpa 825 is 3.44.
What is SA/D (Sail Area Displacement ratio)?
The SA/D for Alpa 825 with ISO 8666 reference sail is 16.0, with a 135% genua the SA/D is 19.1.
Maintenance
Dimensions of sail for masthead 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 | 24.3 m | (79.7 feet) | 8 mm | (5/16 inch) |
| Jib/genoa halyard | 24.3 m | (79.7 feet) | 8 mm | (5/16 inch) |
| Spinnaker halyard | 24.3 m | (79.7 feet) | 8 mm | (5/16 inch) |
| Jib sheet | 8.2 m | (27.1 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 8.2 m | (27.1 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 20.6 m | (67.7 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 18.2 m | (59.5 feet) | 10 mm | (3/8 inch) |
| Cunningham | 3.2 m | (10.5 feet) | 8 mm | (5/16 inch) |
| Kickingstrap | 6.4 m | (21.0 feet) | 8 mm | (5/16 inch) |
| Clew-outhaul | 6.4 m | (21.0 feet) | 8 mm | (5/16 inch) |
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