The Hh 66 is aggressively canvassed for its weight, 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 65.0′, the Hh 66 tops out around 10.8 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √65.0′ LWL = 10.8 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
34.6
Performance-oriented — carries a lot of canvas for its weight.
Displacement / Length
65
Ultralight — responsive and fast, but carries less stores.
Comfort Ratio
10.7
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
3.35
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
40lbs
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
10.7
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
3.35
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° |
5.1 |
6.4 |
7.2 |
7.5 |
| Close Reach60° |
6.2 |
7.8 |
8.7 |
9.1 |
| Beam Reach90° |
7.5 |
9.5 |
10.7 |
11.6 |
| Broad Reach120–135° |
7.0 |
8.8 |
9.8 |
10.7 |
| Run150–180° |
5.6 |
7.0 |
7.9 |
8.2 |
These are simplified estimates based on hull speed (10.8 kts),
SA/D (34.6), 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 Hh 66 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–5 kts
5–16 kts
16–24 kts
24+ kts
Ghosting
0–5 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
5–16 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
16–24 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
24+ 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 Hh 66.
|
Hh 66 |
Alegria 67 |
Cnb 66 |
Oyster 675 |
Privilege 650 |
Swan 65 Frers |
| Dimensions |
| LOA |
65.9 |
66.8 |
67.6 |
69.1 |
69.7 |
66.0 |
| LWL |
65.0 |
— |
60.5 |
60.1 |
63.3 |
60.3 |
| Beam |
28.5 |
32.3 |
18.1 |
18.5 |
30.2 |
18.4 |
| Displacement |
39 |
77 |
68 |
82 |
63 |
60 |
| Ballast |
— |
— |
20 |
— |
— |
14 |
| Sail Area |
2 |
2 |
2 |
— |
2 |
— |
| Performance |
| SA/Disp |
34.6 |
22.0 |
22.2 |
— |
— |
— |
| Bal/Disp |
— |
— |
30.1 |
— |
— |
24.1 |
| Comfort |
10.7 |
— |
35.9 |
— |
16.1 |
— |
| Capsize |
3.35 |
— |
1.77 |
— |
3.03 |
— |
| Hull Speed |
10.8 |
— |
10.4 |
— |
10.7 |
— |