Review of Arc-21

Basic specs.

The Arc-21 is a small catamaran designed by the maritime architect bureau Roberts / Haberman in the early 2000. The Arc-21 is built by the American yard Aquarius Sail Inc..

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Hull

The hull is made of fibreglass. A hull made of fibreglass requires only a minimum of maintenance during the sailing season.

Keel

DaggerBoard aka Sword

The Arc-21 is built with a daggerboard keel. A daggerboard is a lifting keel that can be lowered and raised vertically, allowing the boat to enter shallow waters.

The boat can enter even shallow marinas as the draft is just about 0.74 - 0.84 meter (2.43 - 2.73 ft) dependent on the load.

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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Arc-21 is 2.53.

Compared with other similar sail catamarans it is slimmer than 95% of all other designs.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Arc-21 is 19 which categorizes this boat among 'ultra light racers'.

79% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

Maintenance

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.

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Finally

We are always looking for new photos. If you can contribute with photos for Arc-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

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.