Review of South Coast 25

Basic specs.

The South Coast 25 is a small sailboat designed by the maritime architect Warren Metcalf in the late sixties. A few hundred boats have been produced. The South Coast 25 is built by the American yard South Coast Seacraft Co..

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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 boat is equipped with 5 berths, a galley, 91.0 liter fresh water capacity 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.

Rig

The South Coast 25 is equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.

Keel

Keel of South Coast 25 anno 1969. Prep for fresh coat Interlux drop boards semitranslucent stain and spar urethane.

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 South Coast 25 is 1.86, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 6.1 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 South Coast 25 is about 95 kg/cm, alternatively 536 lbs/inch.
Meaning: if you load 95 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 536 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 South Coast 25 is 20.1.

Comparing this ratio with similar sailboats show that it is more comfortable than 66% of all similar sailboat designs. This comfort value is just above average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for South Coast 25 is 3.33.

Compared with other similar sailboats it is slimmer than 88% of all other designs. It seems that the designer has chosen a significantly more speedy hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for South Coast 25 is 217 which categorizes this boat among 'light crusers & offshore racers'.

54% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

SA/D (Sail Area Displacement ratio)

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

The SA/D for South Coast 25 with ISO 8666 reference sail is 18.4, with a 135% genua the SA/D is 21.3.

The SA/D ratio indicates that it is faster than 69% of all similar sailboat designs in light wind.

Maintenance

Rig

Dimensions of sail for masthead 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	21.9 m	(71.8 feet)	8 mm	(5/16 inch)
Jib/genoa halyard	21.9 m	(71.8 feet)	8 mm	(5/16 inch)
Spinnaker halyard	21.9 m	(71.8 feet)	8 mm	(5/16 inch)
Jib sheet	7.6 m	(25.0 feet)	10 mm	(3/8 inch)
Genoa sheet	7.6 m	(25.0 feet)	10 mm	(3/8 inch)
Mainsheet	19.1 m	(62.5 feet)	10 mm	(3/8 inch)
Spinnaker sheet	16.8 m	(55.0 feet)	10 mm	(3/8 inch)
Cunningham	3.7 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 is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

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

Finally

We are always looking for new photos. If you can contribute with photos for South Coast 25 (Metcalf) 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.