The Southerly 110 Sailboat
Specs & Key Performance Indicators

The Southerly 110, an aft-cockpit fractional sloop, was designed by Rob Humphreys and built in the UK by Northshore Yachts.

A Southerly 110 sailboat sailing on a broad reachA Southerly 110

Published Specification for the Southerly 110

Underwater Profile: Swing keel & skeg-supported rudder

Hull Material: GRP (Fibreglass)

Length Overall: 35'6" (10.8m)

Waterline Length: 30'3" (9.2m)

Beam: 11'9" (3.6m)

Draft: Max 7'2" (2.2m), Min 2'4" (0.7m)

Rig Type: Fractional sloop

Displacement: 15,388lb (6,980kg)

Designer: Rob Humphreys

Builder: Northshore Yachts (UK)

Year First Built: 1999


Published Design Ratios for the Southerly 110

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: 46.6

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

3. Displacement/Length Ratio: 248

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

4. Comfort Ratio: 28.2

  • 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 Southerly 110

1. A Sail Area/Displacement Ratio of just 15.1 suggests that the Southerly 110 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 46.6 means that the Southerly 110 will stand up well to her canvas in a blow, helping her to power through the waves.

3. A Displacement/Length Ratio of 248, tells us the Southerly 110 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 28.2 suggests that crew comfort of a Southerly 110 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

5. The Capsize Screening Formula (CSF) of 1.9 indicates that a Southerly 110 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0. 



Other sailboats in the Southerly range include:

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