The Gs 30 is well-powered with enough sail area to move in light air, with a quick, snappy motion best suited to day sailing.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 23.0′, the Gs 30 tops out around 6.4 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √23.0′ LWL = 6.4 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
SA / Displacement
21.1
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Displacement / Length
207
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
17.2
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
2.15
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
786lbs
Weight needed to sink the hull one inch — loading sensitivity.
Motion & Offshore Suitability
Two ratios that matter most when you're planning passages — how the boat feels in a seaway, and whether the hull geometry is suitable for open ocean.
Comfort Ratio
17.2
Quick, snappy motion — better for day sails and racing than long passages.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
2.15
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
PHRF Fleet Position
Where the Gs 30 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Moore 30
51s/nm
Capri 30 Catalina
111s/nm
Mirage 30 Sx
120s/nm
J/30
144s/nm
Cs 30
150s/nm
Estimated Speed by Wind
Rough boat speed estimates at different true wind speeds and points of sail — derived from hull speed, SA/D, and displacement, not measured polars.
| Point of Sail |
6 kts TWS |
10 kts TWS |
15 kts TWS |
20 kts TWS |
| Close-hauled40–50° |
2.9 |
3.6 |
4.0 |
4.2 |
| Close Reach60° |
3.5 |
4.4 |
4.9 |
5.1 |
| Beam Reach90° |
4.2 |
5.4 |
6.0 |
6.2 |
| Broad Reach120–135° |
3.9 |
5.0 |
5.5 |
5.8 |
| Run150–180° |
3.1 |
4.0 |
4.4 |
4.6 |
These are simplified estimates based on hull speed (6.4 kts),
SA/D (21.1), and empirical efficiency curves — not instrument-measured
polars. Real-world speed varies with sea state, bottom condition, sail trim, and current.
Speeds in gold approach hull speed;
bold gold means near or at hull speed.
Wind Range & Comfort Envelope
Estimated wind ranges for comfortable sailing on the Gs 30 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–6 kts
6–18 kts
18–26 kts
26+ kts
Ghosting
0–6 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
6–18 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
18–26 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
26+ kts
Storm conditions. Storm jib or bare poles. Seek shelter if coastal.
How It Compares
Side-by-side with the boats most often cross-shopped against the Gs 30.
|
Gs 30 |
Capri 30 Catalina |
Cs 30 |
J/30 |
Mirage 30 Sx |
Moore 30 |
| Dimensions |
| LOA |
30.0 |
30.0 |
30.0 |
30.0 |
30.0 |
30.0 |
| LWL |
23.0 |
25.0 |
25.4 |
25.0 |
24.1 |
26.3 |
| Beam |
9.6 |
10.8 |
10.3 |
10.8 |
10.5 |
14.0 |
| Displacement |
5 |
8 |
8 |
6 |
5 |
2 |
| Ballast |
— |
3 |
3 |
2 |
— |
800 |
| Sail Area |
417 |
387 |
462 |
436 |
474 |
466 |
| Performance |
| PHRF |
— |
111 |
150 |
144 |
120 |
51 |
| SA/Disp |
21.1 |
15.5 |
18.5 |
20.8 |
23.3 |
47.1 |
| Bal/Disp |
— |
37.5 |
43.0 |
39.3 |
— |
40.0 |
| Comfort |
17.2 |
12.0 |
20.8 |
23.6 |
15.4 |
3.4 |
| Capsize |
2.15 |
2.62 |
2.05 |
1.73 |
2.33 |
4.45 |
| Hull Speed |
6.4 |
6.6 |
6.8 |
7.6 |
6.6 |
6.9 |