Review of Morgan 42 Mk I

Basic specs.

The Morgan 42 Mk I is a large sailboat designed by the maritime architect Charles Morgan in the late sixties. The Morgan 42 Mk I is built by the American yard Morgan Yacht Corp..

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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.

Rig

The boat 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.

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 Morgan 42 Mk I is 1.73, 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 7.4 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 Morgan 42 Mk I is about 218 kg/cm, alternatively 1224 lbs/inch.
Meaning: if you load 218 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1224 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 Morgan 42 Mk I is 33.1.

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 Morgan 42 Mk I is 3.65.

Compared with other similar sailboats it is slimmer than 85% 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 Morgan 42 Mk I is 298 which categorizes this boat among 'medium weight cruisers'.

24% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Morgan 42 Mk I with ISO 8666 reference sail is 17.7, with a 135% genua the SA/D is 20.9.

The SA/D ratio indicates that it is faster than 54% 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	34.4 m	(113.0 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	34.4 m	(113.0 feet)	12 mm	(1/2 inch)
Spinnaker halyard	34.4 m	(113.0 feet)	12 mm	(1/2 inch)
Jib sheet	12.8 m	(42.0 feet)	14 mm	(0.55 inch)
Genoa sheet	12.8 m	(42.0 feet)	14 mm	(0.55 inch)
Mainsheet	32.0 m	(105.0 feet)	14 mm	(0.55 inch)
Spinnaker sheet	28.2 m	(92.4 feet)	14 mm	(0.55 inch)
Cunningham	5.3 m	(17.5 feet)	12 mm	(1/2 inch)
Kickingstrap	10.7 m	(35.0 feet)	12 mm	(1/2 inch)
Clew-outhaul	10.7 m	(35.0 feet)	12 mm	(1/2 inch)

Boat owner's ideas

This section is reserved boat owner's changes, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

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Finally

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References

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.