Review of OVNI 31
The OVNI 31 is a sailboat designed by the French maritime architect Philippe Briand
in the mid seventies. The OVNI 31 is built by the French yard Alubat
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The hull is made of aluminium.
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.
Theoretical Maximum Hull Speed
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 6.8 knots.
The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster.
The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for OVNI 31 is about 171 kg/cm, alternatively 959 lbs/inch.
Meaning: if you load 171 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 959 lbs cargo on the boat it will sink 1 inch.
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 OVNI 31 is 2.90.
Compared with other similar sailboats it is more spacy than 73% of all other designs.
It seems that the designer has chosen a slightly more spacy hull design.
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
|Jib sheet ||9.5 m||(31.2 feet)||12 mm||(1/2 inch)|
|Genoa sheet||9.5 m||(31.2 feet)||12 mm||(1/2 inch)|
|Mainsheet ||23.8 m||(77.9 feet)||12 mm||(1/2 inch)|
|Spinnaker sheet||20.9 m||(68.6 feet)||12 mm||(1/2 inch)|
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