Review of Coronet 21 Sunrunner

Basic specs.

The Coronet 21 Sunrunner is a small motorboat designed by the maritime architect Jim Wynne together with Hans Bruun Bertelsen from Norway in the early eighties. The Coronet 21 Sunrunner is built by the Danish yard Coronet Boats af 1983 A/S.

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Hull

Both the hull and the deck 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.

Interior

The interior is like most other boats made of teak. Teak has the advantage of being naturally very oily and therefore water-repellent, which is suitable on boats.
The boat is equipped with 2 berths.

Keel

Unknown keel type

The boat can enter even shallow marinas as the draft is just about 0.50 - 0.60 meter (1.64 - 1.94 ft) dependent on the load. See immersion rate below.

Engine

Coronet 21 Sunrunner may be equipped with an inboard Volvo Penta engine at 145 hp (108 kW). Max speed is 28.0 knots.

The fuel tank, which is made of galvanized iron, has a capacity of 220.0 liters (58 US gallons, 48 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.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Coronet 21 Sunrunner is about 100 kg/cm, alternatively 561 lbs/inch.
Meaning: if you load 100 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 561 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 Coronet 21 Sunrunner is 2.74.

Compared with other similar motor boats it is slimmer than 66% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.

Curiosities

Powerboat?

In Denmark, you are required to have achieved a 'powerboat driving license' in order to sail a powerboat.
In this context a boat is considered a powerboat if:

Danish definition of a powerboat

According to this definition this boat is categorized as a Powerboat.

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 Coronet 21 Sunrunner 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.