Review of X-372

Basic specs.

The X-372 is a sailboat designed by the maritime architect Niels Jeppesen in the late eighties. A few hundred boats have been produced. The X-372 is built by the Danish yard X-Yachts A/S.

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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.

Both the hull and the deck is a sandwich construction 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.

Interior

The interior is like many other boats made of mahogany. Mahogany belongs to the hardwood species, known for being water-repellent and resistant to decay. It has an attractive wood grain and holds wood polish and varnish well.
The boat is equipped with 3 cabins, 7 berths, a galley, 110.0 liter fresh water capacity and toilet facility.

Rig

The boat has multiple rigs.

One option is 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 gennaker or a spinnaker for optimal speed.

Another option is 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

Fin keel

The X-372 is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full keel.

X-372 can only enter major marinas as the draft is about 2.00 - 2.10 meter (6.56 - 6.86 ft) dependent on the load. See immersion rate below.

Engine

The boat may be equipped with an inboard Volvo Penta diesel engine at 28 hp (20 kW). The speed is 8.0 knots.

The transmission is a shaft drive. A shaft drive will in the long run require less maintenance than other types of drive e.g. a sail drive.

The fuel tank, which is made of stainless steel, has a capacity of 70.0 liters (18 US gallons, 15 imperial gallons).

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 X-372 is 2.09, indicating that this boat would not 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 7.3 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 X-372 is about 215 kg/cm, alternatively 1205 lbs/inch.
Meaning: if you load 215 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1205 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 X-372 is 20.6.

Comparing this ratio with similar sailboats show that it is more comfortable than 15% 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 X-372 is 3.10.

Compared with other similar sailboats it is more spacy than 66% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for X-372 is 43%.

This ballast ratio shows a righting moment that is higher than 69% of all similar sailboat designs. A righting moment (ability to resist heeling) just above average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for X-372 is 194 which categorizes this boat among 'light racers'.

76% 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 X-372 with ISO 8666 reference sail is 21.2, with a 135% genua the SA/D is 24.3.

The SA/D ratio indicates that it is faster than 92% of all similar sailboat designs in light wind.

Over- / underrigged

The X-372 has more rig than 73% of all similar sailboats, which indicates that the boat is slightly overrigged.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for X-372 is 93

The relative speed performance is 93 which means that a it is faster than 93% of all similar sailboat designs.

Maintenance

Bottom Paint

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 38m² (409 ft²).
Based on this, your favourite maritime shop can tell you the quantity you need.

Note: If you use a paint roller you will need more paint than if you use a paintbrush.

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**
Masthead rig
Usage	Length		Diameter
Mainsail halyard	36.5 m	(119.9 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	36.5 m	(119.9 feet)	12 mm	(1/2 inch)
Spinnaker halyard	36.5 m	(119.9 feet)	12 mm	(1/2 inch)
Jib sheet	11.1 m	(36.3 feet)	14 mm	(0.55 inch)
Genoa sheet	11.1 m	(36.3 feet)	14 mm	(0.55 inch)
Mainsheet	27.6 m	(90.6 feet)	14 mm	(0.55 inch)
Spinnaker sheet	24.3 m	(79.8 feet)	14 mm	(0.55 inch)
Cunningham	5.2 m	(16.9 feet)	12 mm	(1/2 inch)
Kickingstrap	10.3 m	(33.8 feet)	12 mm	(1/2 inch)
Clew-outhaul	10.3 m	(33.8 feet)	12 mm	(1/2 inch)
Masthead rig
Usage	Length		Diameter
Mainsail halyard	31.4 m	(103.0 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	31.4 m	(103.0 feet)	12 mm	(1/2 inch)
Spinnaker halyard	31.4 m	(103.0 feet)	12 mm	(1/2 inch)
Jib sheet	11.1 m	(36.3 feet)	14 mm	(0.55 inch)
Genoa sheet	11.1 m	(36.3 feet)	14 mm	(0.55 inch)
Mainsheet	27.6 m	(90.6 feet)	14 mm	(0.55 inch)
Spinnaker sheet	24.3 m	(79.8 feet)	14 mm	(0.55 inch)
Cunningham	4.0 m	(13.1 feet)	12 mm	(1/2 inch)
Kickingstrap	8.0 m	(26.2 feet)	12 mm	(1/2 inch)
Clew-outhaul	8.0 m	(26.2 feet)	12 mm	(1/2 inch)
Fractional rig
Usage	Length		Diameter
Jib sheet	11.1 m	(36.3 feet)	14 mm	(0.55 inch)
Genoa sheet	11.1 m	(36.3 feet)	14 mm	(0.55 inch)
Mainsheet	27.6 m	(90.6 feet)	14 mm	(0.55 inch)
Spinnaker sheet	24.3 m	(79.8 feet)	14 mm	(0.55 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 X-372 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.