The Gulfstar Sailmaster 47 Sailboat
Specs & Key Performance Indicators

The Gulfstar Sailmaster 47, a centre-cockpit ketch, was designed by Vince Lazzara and built in the USA by Gulfstar Yachts.

Gulfstar Sailmaster 47 ketch under powerA Gulfstar Sailmaster Ketch

Published Specification for the Gulfstar Sailmaster 47

Underwater Configuration: Fin keel with skeg-hung rudder

Hull Material: GRP (Fibreglass)

Length Overall: 42'5" (14.5m)

Waterline Length: 40'6" (12.3m)

Beam: 13'10" (4.2m)

Draft: 5'6" (1.7m)

Rig Type: Ketch

Displacement: 38,000lb (17,237kg)

Designer: Vince Lazzara

Builder: Gulfstar Yachts (USA)

Year First Built: 1978

Year Last Built: 1981

Number Built: 79

Owners Association: The Gulfstar Owners Club

Published Design Ratios for the Gulfstar Sailmaster 47

1. Sail Area/Displacement Ratio: 13.1

  • 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: 27.6

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

3. Displacement/Length Ratio: 255

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

4. Comfort Ratio: 41.7

  • 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: 1.7

  • 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 Gulfstar Sailmaster 47

1. A Sail Area/Displacement Ratio of just 13.1 suggests that the Gulfstar Sailmaster 47 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 27.6 means that the Gulfstar Sailmaster 47 will have a tendency to heel excessively in a gust, and she'll need to be reefed early to keep her sailing upright in a moderate breeze. 

3. A Displacement/Length Ratio of 255, tells us the Gulfstar Sailmaster 47 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 41.7 suggests that crew comfort of a Gulfstar Sailmaster 47 in a seaway is similar to what you would associate with the motion of a heavy bluewater cruising boat. Pitching and rolling will be well damped - your cup of coffee on the salon table stands a reasonable chance of staying there in most conditions.

5. The Capsize Screening Formula (CSF) of 1.7 tells us that a Gulfstar Sailmaster 47 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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