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G Cat 50
Designer: Hans Geissler  ·  Builder: G-Cat (Usa)  ·  First built: 1975
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About the G Cat 50

Designed by Hans Geissler and first launched in 1975, this compact catamaran represents an early entry into the small multihull market that would eventually explode in popularity. At just over 16 feet overall, the G Cat 50 delivers impressive performance through its lightweight fiberglass construction and efficient fractional sloop rig featuring a rotating mast. The boat's most striking characteristic is its exceptional sail area to displacement ratio of 69.05, indicating serious speed potential that places it firmly in performance catamaran territory. This power-to-weight relationship, combined with the 8-foot beam providing stability, makes the G Cat 50 an ideal choice for day sailing, beach launching, and small boat racing where quick acceleration and planing ability matter most. The asymmetric hull design without daggerboards suggests this catamaran was optimized for reaching and running rather than close-hauled work, typical of recreational-focused beach cats of the era. Built by G-Cat in the USA during the mid-1970s boom in small multihulls, this design offers sailors an accessible entry point into catamaran sailing with manageable size for trailering and single-handed operation, while still delivering the exhilarating performance that makes multihull sailing addictive.

Core Dimensions
LOA (Length Overall) 16.67 ft / 5.08 m
LWL (Waterline Length) 15.50 ft / 4.72 m
Beam 8.00 ft / 2.44 m
Displacement 340.00 lb / 154 kg
Sail Area (Reported) 210.00 ft² / 19.51 m²
Design & Construction
Hull Type Catamaran (no boards/asym.)
Rigging Type Frac. Sloop (Rotating Spar)
Construction FG
Designer Hans Geissler
Builder G-Cat (USA)
First Built 1975
Associations G-Cat Owners
Related Sailboats Hobie 16 · Nacra 500 · Windrider 16 · Trac 16 · Tornado Texas
Owner Reviews

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Performance Ratios
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
2.06
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
4.59
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 5.28 kn
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. 2.66 pounds/inch
Engine & Accommodations
KSP 1.55
How It Compares

vs. Hobie 16, Nacra 500, Tornado Texas, Trac 16, Windrider 16

This boat Similar boats
Dimensions
LOA
G Cat 50 ★
16.7 ft
Hobie 16
16.6 ft
Nacra 500
16.4 ft
Tornado Texas
16.4 ft
Trac 16
16.4 ft
Windrider 16
16.6 ft
LWL
G Cat 50 ★
15.5 ft
Hobie 16
Nacra 500
Tornado Texas
15.6 ft
Trac 16
15.9 ft
Windrider 16
Beam
G Cat 50 ★
8.0 ft
Hobie 16
7.9 ft
Nacra 500
8.2 ft
Tornado Texas
5.6 ft
Trac 16
8.0 ft
Windrider 16
12.0 ft
Displacement
G Cat 50 ★
340 lbs
Hobie 16
320 lbs
Nacra 500
297 lbs
Tornado Texas
425 lbs
Trac 16
359 lbs
Windrider 16
250 lbs
Sail Area
G Cat 50 ★
210 sq ft
Hobie 16
Nacra 500
190 sq ft
Tornado Texas
160 sq ft
Trac 16
194 sq ft
Windrider 16
82 sq ft
Performance
SA / Displacement (higher = more powerful)
G Cat 50 ★
Hobie 16
Nacra 500
68.4
Tornado Texas
45.3
Trac 16
Windrider 16
Comfort Ratio (higher = more comfortable offshore)
G Cat 50 ★
2.1
Hobie 16
2.1
Nacra 500
Tornado Texas
4.2
Trac 16
2.2
Windrider 16
0.9
Capsize Screening (lower = safer)
G Cat 50 ★
4.59
Hobie 16
4.63
Nacra 500
Tornado Texas
2.97
Trac 16
4.51
Windrider 16
7.62
Displacement / Length (lower = lighter)
G Cat 50 ★
Hobie 16
51
Nacra 500
Tornado Texas
50
Trac 16
Windrider 16
39
Hull Speed
G Cat 50 ★
5.3 kts
Hobie 16
5.0 kts
Nacra 500
Tornado Texas
5.3 kts
Trac 16
5.4 kts
Windrider 16
5.0 kts
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