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Review of LN-23


Basic specs.

sail specifications
The LN-23 aka Gloucester 22 is a small sailboat designed by the maritime architect Stuart Windley in the late seventies. The LN-23 is built by the American yard Lockley Newport Boats Inc..

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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.

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 LN-23 is 2.06, 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 6.0 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 LN-23 is about 89 kg/cm, alternatively 501 lbs/inch.
Meaning: if you load 89 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 501 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 LN-23 is 14.4.

Low High 46% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 46% of all similar sailboat designs. This comfort value is just below average.


L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for LN-23 is 3.18.

Wide Slim 82% 0 50 100
Compared with other similar sailboats it is slimmer than 82% 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 LN-23 is 150 which categorizes this boat among 'ultra light racers'.

Heavy Light 76% 0 50 100
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 LN-23 with ISO 8666 reference sail is 19.4, with a 135% genua the SA/D is 23.0.

Low High 62% 0 50 100
The SA/D ratio indicates that it is faster than 62% of all similar sailboat designs in light wind.


Maintenance

Rig

Dimensions of sail for fractional rig.

mainsail specifications headsail specifications

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
UsageLengthDiameter
Mainsail halyard 20.2 m(66.1 feet)8 mm(5/16 inch)
Jib/genoa halyard20.2 m(66.1 feet)8 mm(5/16 inch)
Spinnaker halyard20.2 m(66.1 feet)8 mm(5/16 inch)
Jib sheet 7.0 m(22.8 feet)10 mm(3/8 inch)
Genoa sheet7.0 m(22.8 feet)10 mm(3/8 inch)
Mainsheet 17.4 m(57.1 feet)10 mm(3/8 inch)
Spinnaker sheet15.3 m(50.2 feet)10 mm(3/8 inch)
Cunningham2.7 m(9.0 feet)8 mm(5/16 inch)
Kickingstrap5.5 m(18.0 feet)8 mm(5/16 inch)
Clew-outhaul5.5 m(18.0 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 LN-23 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