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Review of Alpa 21


Basic specs.

sail specifications
The Alpa 21 is a small sailboat.

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Hull

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.


Rig

The boat 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.


Keel

The Alpa 21 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 long keel.

The boat can enter even shallow marinas as the draft is just about 1.22 - 1.32 meter (4.00 - 4.30 ft) dependent on the load.


Engine

The boat is typically equipped with an engine.


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.

Sorry, we have no sailing characteristics available for this boat.

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.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Alpa 21 is 27%.

Low High 15% 0 50 100
This ballast ratio shows a righting moment that is higher than 15% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly below average.


Over- / underrigged

Low High 93% 0 50 100
The Alpa 21 has more rig than 93% of all similar sailboats, which indicates that the boat is significantly overrigged.


Maintenance

Rig

Dimensions of sail for masthead rig.

mainsail specifications headsail specifications

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.



Guiding dimensions of running rig
UsageLengthDiameter
Mainsail halyard 21.1 m(69.2 feet)8 mm(5/16 inch)
Jib/genoa halyard21.1 m(69.2 feet)8 mm(5/16 inch)
Spinnaker halyard21.1 m(69.2 feet)8 mm(5/16 inch)
Jib sheet 6.4 m(21.0 feet)10 mm(3/8 inch)
Genoa sheet6.4 m(21.0 feet)10 mm(3/8 inch)
Mainsheet 16.0 m(52.5 feet)10 mm(3/8 inch)
Spinnaker sheet14.1 m(46.2 feet)10 mm(3/8 inch)
Cunningham2.7 m(9.0 feet)8 mm(5/16 inch)
Kickingstrap5.5 m(18.0 feet)8 mm(5/16 inch)
Clew-outhaul5.5 m(18.0 feet)8 mm(5/16 inch)

Boat owner's ideas

This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.



Finally

We are always looking for new photos. If you can contribute with photos for Alpa 21 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.



References