Review of Luna 31

Luna 31 anno 1991. Luna 31 Fly

Basic specs.

The Luna 31 is a motorboat designed by the Danish maritime architect Børge Quorning. The Luna 31 is built by the Danish yard Quorning Både A/S.

Looking for a new boat? Find a Luna 31 or similar boat for sale

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.

Interior

The boat is equipped with 6 berths, a galley and toilet facility.
Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

Keel

Luna 31 can enter even shallow marinas as the draft is just about 0.92 - 1.02 meter (3.02 - 3.32 ft) dependent on the load. See immersion rate below.

Engine

Luna 31 anno 1991. Luna 31 Fly. Flot maskinrun på 18. år

The boat is typically equipped with an inboard Volvo Penta MDT 40 diesel engine at 125.0 hp (93 kW).

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 Luna 31 is about 216 kg/cm, alternatively 1211 lbs/inch.
Meaning: if you load 216 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1211 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 Luna 31 is 2.79.

Compared with other similar motor boats it is more spacy than 82% of all other designs. It seems that the designer has chosen a significantly more spacy 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 not categorized as a Powerboat.
Though, if you install a motor of 93 kW (124 hp), then the boat will become a powerboat, and you will need a Danish 'powerboat driving license'

Maintenance

Boat owner's ideas

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

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

Finally

We are always looking for new photos. If you can contribute with photos for Luna 31 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.