The Lagoon 50 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 46.9′, the Lagoon 50 tops out around 9.2 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √46.9′ LWL = 9.2 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
21.2
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Displacement / Length
198
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
18.8
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
2.97
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
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
18.8
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
2.97
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
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° |
4.1 |
5.2 |
5.8 |
6.0 |
| Close Reach60° |
5.0 |
6.3 |
7.0 |
7.3 |
| Beam Reach90° |
6.1 |
7.7 |
8.6 |
9.3 |
| Broad Reach120–135° |
5.6 |
7.1 |
7.9 |
8.6 |
| Run150–180° |
4.5 |
5.7 |
6.3 |
6.6 |
These are simplified estimates based on hull speed (9.2 kts),
SA/D (21.2), 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 Lagoon 50 — 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 Lagoon 50.
|
Lagoon 50 |
Aura 51 |
Lagoon 440 |
Outremer 51 |
Saona 47 |
| Dimensions |
| LOA |
48.4 |
51.0 |
44.7 |
50.1 |
46.0 |
| LWL |
46.9 |
— |
41.0 |
— |
46.0 |
| Beam |
26.6 |
26.5 |
25.2 |
24.4 |
25.3 |
| Displacement |
45 |
39 |
12,150 |
22 |
30 |
| Sail Area |
1,701 |
1 |
394 |
1 |
807 |
| Performance |
| SA/Disp |
21.2 |
22.8 |
11.9 |
27.4 |
— |
| Comfort |
18.8 |
17.0 |
6.0 |
— |
13.7 |
| Capsize |
2.97 |
3.11 |
4.38 |
3.49 |
3.25 |
| Hull Speed |
9.2 |
8.8 |
8.6 |
— |
9.1 |