The Hylas 70 is well-powered with enough sail area to move in light air, with a steady, comfortable ride offshore.
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 61.6′, the Hylas 70 tops out around 10.5 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √61.6′ LWL = 10.5 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
21.7
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Ballast / Displacement
38.5%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
144
Ultralight — responsive and fast, but carries less stores.
Comfort Ratio
38.4
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.71
Below the 2.0 offshore threshold — acceptable for ocean passages.
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
38.4
Good offshore comfort — steady enough for multi-day passages.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
1.71
Below the 2.0 offshore threshold — acceptable for ocean passages.
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° |
4.8 |
6.0 |
6.7 |
7.0 |
| Close Reach60° |
5.8 |
7.3 |
8.1 |
8.5 |
| Beam Reach90° |
7.1 |
8.9 |
10.0 |
10.8 |
| Broad Reach120–135° |
6.5 |
8.2 |
9.2 |
10.0 |
| Run150–180° |
5.2 |
6.6 |
7.4 |
7.7 |
These are simplified estimates based on hull speed (10.5 kts),
SA/D (21.7), 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 Hylas 70 — 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 Hylas 70.
|
Hylas 70 |
Amel 54 |
Hylas 49 |
Hylas 56 |
Island Packet 485 |
| Dimensions |
| LOA |
69.7 |
53.8 |
— |
54.1 |
52.2 |
| LWL |
61.6 |
50.3 |
— |
46.0 |
43.2 |
| Beam |
18.0 |
15.8 |
— |
15.8 |
15.3 |
| Displacement |
75 |
35,000 |
— |
50 |
44,150 |
| Ballast |
28 |
— |
— |
20 |
16,000 |
| Sail Area |
2 |
1,507 |
— |
1 |
1,234 |
| Performance |
| SA/Disp |
21.7 |
22.5 |
— |
21.5 |
15.8 |
| Bal/Disp |
38.5 |
— |
— |
39.9 |
36.2 |
| Comfort |
38.4 |
26.6 |
— |
40.5 |
38.9 |
| Capsize |
1.71 |
1.93 |
— |
1.72 |
1.73 |
| Hull Speed |
10.5 |
9.5 |
— |
9.1 |
8.8 |