The Moody 41 Classic Sailboat
Specs & Key Performance Indicators

Published Specification for the Moody 41 Classic

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

Hull Material: GRP (Fibreglass)

Length Overall: 41'8" (12.7m)

Waterline Length: 39'9" (xm)

Beam: 13'2" (4.0m)

Draft: 6'6" (2.0m)

Rig Type: Solent-Rigged fractional sloop

Displacement: 21,605lb (9,800kg)

Ballast: 6,063lb (2,705kg)

Designer: Bill Dixon

Builder: A. H. Moody & Son Ltd (UK)

Year First Built: 2009

Published Design Ratios for the Moody 41 Classic

1. Sail Area/Displacement Ratio: 20.6

• 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: 28.1

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

3. Displacement/Length Ratio: 211

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

4. Comfort Ratio: 28.9

• 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 41 Classic

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1. A Sail Area/Displacement Ratio of 20.6 suggests that, in the right hands, the Moody 41 Classic will have enough performance to leave most other sailboats of similar waterline length well astern. 

2. A Ballast/Displacement Ratio of 28.1 would usually mean that the Moody 41 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 211 tells us the Moody 41 Classic is a moderate displacement cruiser, which means she'll carry all your cruising gear without it having a dramatic effect on her performance. Most of today's sailboats intended for offshore cruising fall into this displacement category.

4. Ted Brewer's Comfort Ratio of 28.9 suggests that crew comfort of a Moody 41 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 41 Classic would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.