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Gs 27
Designer: Graham & Schlageter  ·  First built: 1986
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About the Gs 27

Designed by the collaborative team of Graham & Schlageter, this 27-footer represents a thoughtful approach to small boat cruising that emerged during the mid-1980s sailing boom. With its moderate proportions and fiberglass construction, the Gs 27 strikes a balance between performance and comfort that appeals to sailors seeking a capable coastal cruiser. The boat's design philosophy centers on seaworthiness and manageable sailing characteristics. A healthy ballast-to-displacement ratio of nearly 39% provides excellent stability, while the fin keel configuration with transom-hung rudder delivers responsive handling and good upwind performance. The masthead sloop rig keeps sail handling straightforward, making this an ideal choice for couples or small crews. At 22.50 feet on the waterline, the Gs 27 achieves a respectable hull speed while maintaining the draft and beam proportions that allow access to most harbors and anchorages. The comfort ratio of 17.7 suggests this design prioritizes motion comfort over pure speed, making longer passages more pleasant. Well-suited for coastal cruising and weekend adventures, this design offers the security of substantial construction with sailing characteristics that build confidence. The capsize screening value indicates good stability margins for its intended use in protected and near-coastal waters.

Core Dimensions
LOA (Length Overall) 27.00 ft / 8.23 m
LWL (Waterline Length) 22.50 ft / 6.86 m
Beam 9.00 ft / 2.74 m
Max Draft 5.00 ft / 1.52 m
Displacement 5,100.00 lb / 2,313 kg
Ballast 1,975.00 lb / 896 kg
Sail Area (Reported) 361.00 ft² / 33.54 m²
Design & Construction
Hull Type Fin w/transom hung rudder
Rigging Type Masthead Sloop
Construction FG
Designer Graham & Schlageter
First Built 1986
Related Sailboats ["J/27" · "Precision 27" · "Santa Cruz 27" · "Cs 27" · "Tartan 27 2"]
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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
 19.55
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
 38.73
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
 199.88
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
 17.7
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
 2.09
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. 6.36 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 3
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. 723.55 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 19.57
Rig Dimensions
I (Foretriangle Height) 35.00 ft / 10.67 m
J (Foretriangle Base) 10.50 ft / 3.20 m
P (Mainsail Luff) 29.00 ft / 8.84 m
E (Mainsail Foot) 12.25 ft / 3.73 m
SA Fore 183.75 ft² / 17.07 m²
SA Main 177.63 ft² / 16.50 m²
SA Total (100%) 361.38 ft² / 33.57 m²
Est. Forestay Length 36.54 ft / 11.14 m
How It Compares

vs. Cs 27, Precision 27, Santa Cruz 27

This boat Similar boats
Dimensions
LOA
Gs 27 ★
27.0 ft
Cs 27
27.0 ft
Precision 27
27.0 ft
Santa Cruz 27
27.0 ft
LWL
Gs 27 ★
22.5 ft
Cs 27
23.9 ft
Precision 27
22.8 ft
Santa Cruz 27
24.1 ft
Beam
Gs 27 ★
9.0 ft
Cs 27
9.3 ft
Precision 27
10.0 ft
Santa Cruz 27
8.0 ft
Displacement
Gs 27 ★
5 lbs
Cs 27
6 lbs
Precision 27
5 lbs
Santa Cruz 27
3 lbs
Ballast
Gs 27 ★
1 lbs
Cs 27
2 lbs
Precision 27
1 lbs
Santa Cruz 27
1 lbs
Sail Area
Gs 27 ★
361 sq ft
Cs 27
453 sq ft
Precision 27
—
Santa Cruz 27
301 sq ft
Performance
PHRF Rating (lower = faster)
Gs 27 ★
—
Cs 27
204 s/nm
Precision 27
222 s/nm
Santa Cruz 27
144 s/nm
SA / Displacement (higher = more powerful)
Gs 27 ★
19.6
Cs 27
21.8
Precision 27
—
Santa Cruz 27
23.2
Ballast / Disp (higher = stiffer)
Gs 27 ★
38.7 %
Cs 27
—
Precision 27
33.3 %
Santa Cruz 27
50.0 %
Comfort Ratio (higher = more comfortable offshore)
Gs 27 ★
17.7
Cs 27
19.4
Precision 27
—
Santa Cruz 27
11.6
Capsize Screening (lower = safer)
Gs 27 ★
2.09
Cs 27
2.05
Precision 27
—
Santa Cruz 27
2.22
Displacement / Length (lower = lighter)
Gs 27 ★
199
Cs 27
—
Precision 27
202
Santa Cruz 27
95
Hull Speed
Gs 27 ★
6.4 kts
Cs 27
6.6 kts
Precision 27
—
Santa Cruz 27
6.6 kts
Speed Number (higher = faster)
Gs 27 ★
3.0
Cs 27
2.6
Precision 27
—
Santa Cruz 27
5.3
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