Review of B 25

Basic specs.

The B 25 is a small sailboat designed by the maritime architect bureau Elvstrøm & Kjærulff in the mid seventies.

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Interior

The boat is equipped with 5 berths.
Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

Rig

The boat equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a genaker or a spinnaker for optimal speed.

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 B 25 is 2.13, indicating that this boat would not be accepted to participate in ocean races.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for B 25 is about 131 kg/cm, alternatively 737 lbs/inch.
Meaning: if you load 131 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 737 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 B 25 is 2.86.

Compared with other similar sailboats it is more spacy than 62% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for B 25 with ISO 8666 reference sail is 16.8, with a 135% genua the SA/D is 19.4.

The SA/D ratio indicates that it is faster than 50% of all similar sailboat designs in light wind.

Maintenance

Rig

Dimensions of sail for fractional rig.

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	22.6 m	(74.2 feet)	8 mm	(5/16 inch)
Jib/genoa halyard	22.6 m	(74.2 feet)	8 mm	(5/16 inch)
Spinnaker halyard	22.6 m	(74.2 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	(61.5 feet)	10 mm	(3/8 inch)
Spinnaker sheet	16.5 m	(54.1 feet)	10 mm	(3/8 inch)
Cunningham	3.4 m	(11.0 feet)	8 mm	(5/16 inch)
Kickingstrap	6.7 m	(22.0 feet)	8 mm	(5/16 inch)
Clew-outhaul	6.7 m	(22.0 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

We are always looking for new photos. If you can contribute with photos for B 25 (Elvstrøm & Kjærulff) 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.