The Moody 33 Sailboat

The Moody 33, a masthead sloop, was designed by Angus Primrose and built in the UK by Marine Projects Ltd.

A Moody 33 Mk1 under full sailThe centre-cockpit Moody 33 has a separate aft cabin

Published Specification for the Moody 33

Underwater Profile: Fin & Skeg

Hull Material: GRP (Fibreglass)

Length Overall: 33'0" (10.1m)

Waterline Length: 28'6" (8.7m)

Beam: 11'6" (3.5m)

Draft: 4'5" (1.35m)

Rig Type: Masthead sloop

Displacement: 10,523lb (4,773kg)

Designer: Angus Primrose

Builder: Marine Projects (UK)

Year First Built:1973

Year Last Built 1978

Owners Association: Moody Owners Association


Published Design Ratios for the Moody 33

1. Sail Area/Displacement Ratio: 15.1

  • Less than 16 would be considered under-powered;
  • 16 to 20 would indicate reasonably good performance;
  • Over 20 suggests relatively high performance.

2. Ballast/Displacement Ratio: 36.2

  • Under 40: less stiff, less powerful
  • Over 40: stiffer, more powerful

3. Displacement/Length Ratio: 303

  • Under 100: Ultralight
  • 100 to 200: Light
  • 200 to 275: Moderate
  • 275 to 350: Heavy
  • Over 350: Ultraheavy

4. Comfort Ratio: 21.0

  • Under 20 indicates a lightweight racing boat
  • 20 to 30 indicates a coastal cruiser
  • 30 to 40 indicates a moderate offshore cruising boat
  • 40 to 50 indicates a heavy offshore boat
  • Over 50 indicates an extremely heavy offshore boat

5. Capsize Screening Formula: 2.1

  • Under 2.0 (the lower the better): Better suited for ocean passages
  • Over 2.0: Less suited for ocean passages

read more about these all-revealing numbers...


Summary Analysis of the Design Ratios for the Moody 33

1. A Sail Area/Displacement Ratio of just 15.1 suggests that the Moody 33 will need a stiff breeze to get her going. In light conditions, unless you've got plenty of time on your hands, motor-sailing may be the way to go.

2. A Ballast/Displacement Ratio of 36.2 means that unless the bulk of the ballast is concentrated in a bulb at the foot of her keel, the Moody 33 will have a tendency to heel excessively in a gust, and she'll need to be reefed early to keep her sailing upright in a moderate breeze. 

3. A Displacement/Length Ratio of 303, tells us the Moody 33 is clearly a heavy displacement cruising boat. You can load her down with all your cruising gear and equipment and it will hardly affect her waterline. Not an ideal choice for coastal sailing, but she'll come into her own on an offshore passage in testing conditions.

4. Ted Brewer's Comfort Ratio of 21.1 suggests that crew comfort of a Moody 33 in a seaway is similar to what you would associate with the motion of a coastal cruiser with moderate stability, which is not encouraging news for anyone prone to seasickness. 

5. The Capsize Screening Formula of 2.1 tells us that a Moody 33 would not be a good choice of sailboat for ocean passage-making, owing to the increased risk of capsize in strong winds and heavy seas when compared to a sailboat with a CSF of less than 2.0.

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