The Beneteau Oceanis 50 Sailboat
Specs & Key Performance Indicators

The Beneteau Oceanis 50, a fractional sloop, was designed by Berret Racoupeau and built in France by Beneteau.

A Beneteau Oceanis 50 sailboat at anchorA Beneteau Oceanis 50

Published Specification for the Beneteau Oceanis 50

Hull Type: Bulb fin keel & spade rudder

Hull Material: GRP (Fibreglass)

Length Overall: 49'6" (15.1m)

Waterline Length: 43'8" (13.3m)

Beam: 14'9" (4.5m)

Draft: 5'7" (1.7m)

Rig Type: Fractional Sloop

Displacement: 27,454lb (12,453kg)

Designer: Berret Racoupeau

Builder: Beneteau (France)

Year First Built: 2010

Published Design Ratios for the Beneteau Oceanis 50

1. Sail Area/Displacement Ratio: 20.9

  • 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: 34.5

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

3. Displacement/Length Ratio: 148

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

4. Comfort Ratio: 25.9

  • 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: 2.0

  • 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 Beneteau Oceanis 50

1. A Sail Area/Displacement Ratio of 20.9 suggests that, in the right hands, the Beneteau Oceanis 50 will have enough performance to leave most other sailboats of similar waterline length well astern. 

2. A Ballast/Displacement Ratio of 34.5 would usually mean that the Beneteau Oceanis 50 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 148, tells us the Beneteau Oceanis 50 is clearly 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 25.9 suggests that crew comfort of a Beneteau Oceanis 50 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 (CSF) of 2.0 is on the cusp of suitability for an ocean passage, so venture offshore with caution.

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