Review of 420

Basic specs.

The 420 aka 420er is a sailing dinghy designed by the French maritime architect Christian Maury in the early sixties. Several thousand boats have been produced.

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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.
The hull is a double hull.

Keel

The boat can sail close to the beach as the draft is just 0.17 - 0.27 meter (0.56 - 0.86 ft) dependent of 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.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for 420 is about 43 kg/cm, alternatively 245 lbs/inch.
Meaning: if you load 43 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 245 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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for 420 is 2.58.

Compared with other similar dinghies it is more spacy than 54% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

Maintenance

Boat owner's ideas

This section is reserved boat owner's changes, 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 420 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.