The X-612 Sailboat
Specs & Key Performance Indicators

The X-612, an aft-cockpit sloop, was designed by Niels Jeppesen and built in Denmark by X-Yachts.

An X-612 fast cruising yacht at anchor in Chatham Bay, Union Island, West IndiesThe X-612

Published Specification for the X-612

  • Underwater Profile: Fin keel with bulb & spade rudder
  • Hull Material: GRP (Fibreglass)
  • Length Overall: 60'0" (18.3m)
  • Waterline Length: 52'1" (15.9m)
  • Beam: 16'9" (5.1m)
  • Draft: 9'6" (2.9m)
  • Rig Type: Masthead Sloop
  • Displacement: 47,400lb (21,500kg)
  • Designer: Niels Jeppesen
  • Builder: X-Yachts (Denmark)
  • Year First Built: 1995
  • Year Last Built: 2004
  • Number Built: 12

Published Design Ratios for the X-612

1. Sail Area/Displacement Ratio: 23.0

  • 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: 42.3

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

3. Displacement/Length Ratio: 150

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

4. Comfort Ratio: 31.5

  • 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 X-612

1. A Sail Area/Displacement Ratio of 23.0 suggests that, in the right hands, the X-612 will have enough performance to leave most other sailboats of similar waterline length well astern. 

2. A Ballast/Displacement Ratio of 42.3 means that the X-612 will stand up well to her canvas in a blow, helping her to power through the waves.

3. A Displacement/Length Ratio of 150, tells us the X-612 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 31.5 suggests that crew comfort of a X-612 in a seaway is similar to what you would associate with the motion of a moderate bluewater cruising boat - a predictable and acceptable motion for most seasoned sailors.

5. The Capsize Screening Formula (CSF) of 1.9 tells us that a X-612 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0. 

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