Review of Moody 33 Mk II

Moody 33 Mk II
Moody 33 Mk II anno 1980. Lift out

Basic specs.

sail specifications
The Moody 33 Mk II is a motorsailer designed by the British maritime architect Angus S. Primrose. The Moody 33 Mk II is built by the British yard A. H. Moody & Son Ltd..

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The hull is made of hand laid fibreglass. Generally, a hull made of hand laid fibreglass requires only a minimum of maintenance during the sailing season.

The interior is like few other boats made in fibreglass.
The boat is equipped with 2 cabins, 6-7 berths, a galley and toilet facility.

Keel of Moody 33 Mk II anno 1980. Out on hard standage


The boat is typically equipped with an inboard Thornycroft-Perkins engine at 35.0 hp (26 kW), which gives a max speed about 7.2 knots.

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

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 Moody 33 Mk II is 2.10, 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 7.2 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 Moody 33 Mk II is about 204 kg/cm, alternatively 1144 lbs/inch.
Meaning: if you load 204 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1144 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 Moody 33 Mk II is 20.9.

Low High 27% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 27% 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 Moody 33 Mk II is 2.87.

Slim Wide 79% 0 50 100
Compared with other similar sailboats it is more spacy than 79% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Moody 33 Mk II is 202 which categorizes this boat among 'light crusers & offshore racers'.

Heavy Light 69% 0 50 100
69% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.



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
Jib sheet 10.1 m(33.0 feet)12 mm(1/2 inch)
Genoa sheet10.1 m(33.0 feet)12 mm(1/2 inch)
Mainsheet 25.2 m(82.5 feet)12 mm(1/2 inch)
Spinnaker sheet22.1 m(72.6 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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