Review of Westerly Pentland

Basic specs.

The Westerly Pentland is a sailboat designed by the British maritime architect Jack Laurent Giles in the early seventies.

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Interior

The boat is equipped with 3 cabins, 6 berths, a galley and toilet facility.

Rig

The boat equipped with a ketch rig.

Keel

The Westerly Pentland is equipped with a bilge keel. A bilge keel is a double keel, which allows the boat to be beached. Bilge keels are the most popular keel for tidal waters.

The boat can enter even shallow marinas as the draft is just about 1.10 - 1.20 meter (3.61 - 3.91 ft) dependent on the load. See immersion rate below.

Engine

Westerly Pentland is typically equipped with an inboard Ford diesel engine at 25.0 hp (18 kW).

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 Westerly Pentland is 1.71, indicating that this boat could - if evaluated by this formula alone - 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 Westerly Pentland is about 192 kg/cm, alternatively 1077 lbs/inch.
Meaning: if you load 192 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1077 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 Westerly Pentland is 3.41.

Compared with other similar sailboats it is slimmer than 69% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Westerly Pentland is 41%.

This ballast ratio shows a righting moment that is higher than 50% of all similar sailboat designs. This righting moment (ability to resist heeling) is spot on average!

Maintenance

Rig

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
Jib sheet	9.9 m	(32.5 feet)	12 mm	(1/2 inch)
Genoa sheet	9.9 m	(32.5 feet)	12 mm	(1/2 inch)
Mainsheet	24.8 m	(81.2 feet)	12 mm	(1/2 inch)
Spinnaker sheet	21.8 m	(71.5 feet)	12 mm	(1/2 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 Westerly Pentland 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.