The Gulfstar 50 Sailboat
Specs & Key Performance Indicators
The Gulfstar 50, a centre-cockpit ketch, was designed by Vincent Lazarra and built in the USA by Gulfstar Yachts.
A Gulfstar 50 Ketch - also available as a sloop
Published Specification for the Gulfstar 50
Underwater Profile: Fin keel with skeg-hung rudder
Hull Material: GRP (Fibreglass)
Length Overall: 50'0" (15.2m)
Waterline Length: 39'8" (12.1m)
Beam: 13'8" (4.2m)
Draft: 5'6" (1.7m)
Rig Type: Ketch
Displacement: 35,000lb (15,876kg)
Designer: Vincent Lazarra
Builder: Gulfstar Yachts (USA)
Year First Built: 1975
Year Last Built: 1980
Number Built: 250
Published Design Ratios for the Gulfstar 50
1. Sail Area/Displacement Ratio: 13.5
- 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: 30.0
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 250
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 38.9
- 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: 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 50
1. A Sail Area/Displacement Ratio of 13.5 suggests that the Gulfstar 50 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 30.0 means that a sailboat like the Gulfstar 50 (which doesn't have its ballast concentrated in a bulb at the foot of a deep keel), is likely to benefit from being reefed early to keep her sailing upright in a moderate breeze.
3. A Displacement/Length Ratio of 250, tells us the Gulfstar 50 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 38.9 suggests that crew comfort of a Gulfstar 50 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 1.7 tells us that a Gulfstar 50 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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