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Gulfstar 50 Kth
Designer: Lazarra  ·  Builder: Gulfstar  ·  First built: 1980
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About the Gulfstar 50 Kth

Built during Gulfstar's productive era of fiberglass sailboat manufacturing, this 50-footer represents the builder's commitment to creating substantial cruising vessels for serious offshore sailors. Gulfstar established a reputation for constructing solid, seaworthy boats that could handle extended passages and challenging conditions, and the 50 Kth continues this tradition. The design emphasizes comfort and capability over racing performance, making it well-suited for coastal cruising and offshore passages. Like other Gulfstar models from this period, the boat likely features a full keel configuration that prioritizes directional stability and seaworthiness over quick tacking ability. This characteristic makes it particularly appealing to cruisers planning extended voyages or those who value predictable handling in varied sea conditions. The accommodations typically reflect the era's approach to liveaboard cruising, with thoughtful use of interior space and emphasis on comfort during extended time aboard. While detailed specifications remain limited, the Gulfstar name carries weight among cruising enthusiasts who appreciate robust construction and time-tested design principles. For sailors seeking a capable passage-maker with proven offshore credentials, this model represents Gulfstar's dedication to building boats meant for serious sailing adventures.

Core Dimensions
LOA (Length Overall) 50.00 ft / 15.24 m
LWL (Waterline Length) 39.67 ft / 12.09 m
Beam 13.67 ft / 4.17 m
Max Draft 5.50 ft / 1.68 m
Displacement 35,000.00 lb / 15,876 kg
Ballast 10,500.00 lb / 4,763 kg
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Ketch
Construction FG
Designer Lazarra
Builder Gulfstar
First Built 1980
Owner Reviews

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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
132
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
30.0
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
250.28
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 11.62 pounds/inch
Rig Dimensions
I (Foretriangle Height) 14.48
J (Foretriangle Base) 19.10 ft / 5.82 m
P (Mainsail Luff) 964.00 ft² / 89.56 m²
E (Mainsail Foot) 250.28
How It Compares

vs. Csy 50 Pilot House, Dickerson 50, Gulfstar 50, Gulfstar 50 Sailmaster, Passport 50

This boat Similar boats
Dimensions
LOA
Gulfstar 50 Kth ★
50.0 ft
Csy 50 Pilot House
50.1 ft
Dickerson 50
50.0 ft
Gulfstar 50
50.0 ft
Gulfstar 50 Sailmaster
50.0 ft
Passport 50
50.0 ft
LWL
Gulfstar 50 Kth ★
39.7 ft
Csy 50 Pilot House
38.6 ft
Dickerson 50
38.8 ft
Gulfstar 50
39.7 ft
Gulfstar 50 Sailmaster
41.0 ft
Passport 50
39.0 ft
Beam
Gulfstar 50 Kth ★
13.7 ft
Csy 50 Pilot House
14.0 ft
Dickerson 50
13.8 ft
Gulfstar 50
13.7 ft
Gulfstar 50 Sailmaster
14.5 ft
Passport 50
13.5 ft
Displacement
Gulfstar 50 Kth ★
35 lbs
Csy 50 Pilot House
34 lbs
Dickerson 50
33 lbs
Gulfstar 50
35 lbs
Gulfstar 50 Sailmaster
41 lbs
Passport 50
34 lbs
Ballast
Gulfstar 50 Kth ★
10 lbs
Csy 50 Pilot House
15 lbs
Dickerson 50
14 lbs
Gulfstar 50
10 lbs
Gulfstar 50 Sailmaster
11 lbs
Passport 50
13 lbs
Sail Area
Gulfstar 50 Kth ★
Csy 50 Pilot House
1 sq ft
Dickerson 50
1 sq ft
Gulfstar 50
896 sq ft
Gulfstar 50 Sailmaster
1 sq ft
Passport 50
Performance
PHRF Rating (lower = faster)
Gulfstar 50 Kth ★
132 s/nm
Csy 50 Pilot House
Dickerson 50
Gulfstar 50
126 s/nm
Gulfstar 50 Sailmaster
123 s/nm
Passport 50
SA / Displacement (higher = more powerful)
Gulfstar 50 Kth ★
Csy 50 Pilot House
15.7
Dickerson 50
17.7
Gulfstar 50
13.5
Gulfstar 50 Sailmaster
13.6
Passport 50
Ballast / Disp (higher = stiffer)
Gulfstar 50 Kth ★
30.0 %
Csy 50 Pilot House
43.5 %
Dickerson 50
Gulfstar 50
30.0 %
Gulfstar 50 Sailmaster
Passport 50
38.2 %
Comfort Ratio (higher = more comfortable offshore)
Gulfstar 50 Kth ★
Csy 50 Pilot House
37.8
Dickerson 50
37.5
Gulfstar 50
38.9
Gulfstar 50 Sailmaster
41.2
Passport 50
Capsize Screening (lower = safer)
Gulfstar 50 Kth ★
Csy 50 Pilot House
1.72
Dickerson 50
1.71
Gulfstar 50
1.68
Gulfstar 50 Sailmaster
1.69
Passport 50
Displacement / Length (lower = lighter)
Gulfstar 50 Kth ★
250
Csy 50 Pilot House
268
Dickerson 50
Gulfstar 50
250
Gulfstar 50 Sailmaster
Passport 50
255
Hull Speed
Gulfstar 50 Kth ★
Csy 50 Pilot House
8.3 kts
Dickerson 50
8.3 kts
Gulfstar 50
8.4 kts
Gulfstar 50 Sailmaster
8.6 kts
Passport 50
Speed Number (higher = faster)
Gulfstar 50 Kth ★
Csy 50 Pilot House
1.8
Dickerson 50
Gulfstar 50
1.8
Gulfstar 50 Sailmaster
1.7
Passport 50
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