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.
A 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.
May 16, 22 04:32 AM
Interested in the Etap 32i sailboat? Here are the pics, specs and performance predictions you're looking for...
May 15, 22 10:55 AM
Interested in the X-332 sailboat? Here are the pics, specs and performance predictions you're looking for...
May 14, 22 06:47 AM
Interested in the Jeanneau Sun Odyssey 44 sailboat? Here are the pics, specs and performance predictions you're looking for...