The Moody 45 Classic Sailboat
Specs & Key Performance Indicators

Published Specification for the Moody 45 Classic

Underwater Profile: Bulb fin L-shaped keel & spade rudder

Hull Material: GRP (Fibreglass)

Length Overall: 46'0" (14.0m)

Waterline Length: 40'0" (12.2m)

Beam: 13'9" (4.2m)

Draft: 7'3" (2.3m)

Rig Type: Fractional sloop

Displacement: 25,353lb (11,500kg)

Ballast: 7,319lb (3,320kg)

Designer: Bill Dixon

Builder: A. H. Moody & Sons Ltd (UK)

Year First Built: 2010

Published Design Ratios for the Moody 45 Classic

1. Sail Area/Displacement Ratio: 24.7

• 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: 28.9

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

3. Displacement/Length Ratio: 176

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

4. Comfort Ratio: 28.5

• 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: 1.9

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

read more about these Key Performance Indicators...

Summary Analysis of the Design Ratios for the Moody 45 Classic

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1. A Sail Area/Displacement Ratio of 24.7 suggests that, in the right hands, the Moody 45 Classic will have enough performance to leave most other sailboats of similar waterline length well astern. 

2. A Ballast/Displacement Ratio of 28.9 would usually mean that the Moody 45 Classic would have a tendency to heel uncomfortably in a gust, and need to be reefed early to keep her sailing upright in a moderate breeze.

However, as she has much of her ballast concentrated in a bulb at the foot of her keel, she's likely to be considerably stiffer than her published Ballast/Displacement Ratio might suggest.

3. A Displacement/Length Ratio of 176 tells us the Moody 45 Classic is a light displacement sailboat. If she's loaded with too much heavy cruising gear her performance will suffer to a degree.

4. Ted Brewer's Comfort Ratio of 28.5 suggests that crew comfort of a Moody 45 Classic in a seaway is similar to what you would associate with the motion of a coastal cruiser with moderate stability, which is not the best of news for anyone prone to seasickness. 

5. The Capsize Screening Formula (CSF) of 1.9 indicates that a Moody 45 Classic would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.