Review of Bénéteau 25 Platu

Basic specs.

The Bénéteau 25 Platu aka Beneteau 25 (One-Design) or Platu 25 is a sailboat designed by the American maritime architect bureau Farr Yacht Design, Ltd. in the late nineties. The Bénéteau 25 Platu is built by the New Zealander yard McDell Marine.

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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 which improves the indoor climate. Especially when the water is colder than the air in the cabin, then the double hull insulates against cold water and reduce the condense water in the cabin.

Keel

Engine

An outboard motor is often used on this boat. In that case the boat will typically require a power of 3 - 4 hp, alternatively 55 - 66 lbs thrust if you prefer an electrical motor. Electric outboards are becoming popular for sailboat owners who want clean instant power with less noise and no exhaust fumes.

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.

Stability and Safety

What is Capsize Screening Formula (CSF)?

The capsize screening value for Bénéteau 25 Platu is 2.40, indicating that this boat would not be accepted to participate in ocean races.

EU classification

Bénéteau 25 Platu holds one CE certification:

The boat is by European Union certified as Class C. INSHORE:

Designed for voyages in coastal waters, large bays, estuaries, lakes and rivers where conditions up to, and including, wind force 6 (Beaufort scale) and significant wave heights up to, and including, 2 m may be experienced.

Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 6.3 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.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Bénéteau 25 Platu is about 115 kg/cm, alternatively 649 lbs/inch.
Meaning: if you load 115 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 649 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.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Bénéteau 25 Platu is 10.8.

Comparing this ratio with similar sailboats show that it is more comfortable than 12% of all similar sailboat designs. This is a comfort value significantly below average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Bénéteau 25 Platu is 2.93.

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

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Bénéteau 25 Platu is 112 which categorizes this boat among 'ultra light racers'.

90% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

Maintenance

Rig

Dimensions of sail.

Are your sails worn out? You might find your next sail here: Sails for Sale

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**
Usage	Length		Diameter
Mainsail halyard	24.8 m	(81.4 feet)	8 mm	(5/16 inch)
Jib/genoa halyard	24.8 m	(81.4 feet)	8 mm	(5/16 inch)
Spinnaker halyard	24.8 m	(81.4 feet)	8 mm	(5/16 inch)
Jib sheet	7.5 m	(24.6 feet)	10 mm	(3/8 inch)
Genoa sheet	7.5 m	(24.6 feet)	10 mm	(3/8 inch)
Mainsheet	18.8 m	(61.6 feet)	10 mm	(3/8 inch)
Spinnaker sheet	16.5 m	(54.2 feet)	10 mm	(3/8 inch)
Cunningham	3.6 m	(12.0 feet)	8 mm	(5/16 inch)
Kickingstrap	7.3 m	(24.0 feet)	8 mm	(5/16 inch)
Clew-outhaul	7.3 m	(24.0 feet)	8 mm	(5/16 inch)

Boat owner's ideas

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

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Finally

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References

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