The International 806 is moderately powered for comfortable coastal cruising, 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 International 806 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
17.5
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
40.0%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
146
Ultralight — responsive and fast, but carries less stores.
Comfort Ratio
17.0
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
1.93
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
627lbs
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
17.0
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
1.93
Below the 2.0 offshore threshold — acceptable for ocean passages.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
PHRF Fleet Position
Where the International 806 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser 150–210
Heavy Cruiser 210–300
Tanzer 26
216s/nm
Tanzer 27
216s/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° |
2.6 |
3.3 |
3.7 |
3.8 |
| Close Reach60° |
3.1 |
4.0 |
4.4 |
4.6 |
| Beam Reach90° |
3.9 |
4.9 |
5.4 |
5.9 |
| Broad Reach120–135° |
3.6 |
4.5 |
5.0 |
5.4 |
| Run150–180° |
2.8 |
3.6 |
4.0 |
4.2 |
These are simplified estimates based on hull speed (6.4 kts),
SA/D (17.5), 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 International 806 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–7 kts
7–20 kts
20–28 kts
28+ kts
Ghosting
0–7 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
7–20 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
20–28 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
28+ 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 International 806.
|
International 806 |
Cal 2 27 |
Cc 27 Mk V |
First 26 Beneteau |
Tanzer 26 |
Tanzer 27 |
| Dimensions |
| LOA |
26.4 |
26.6 |
26.5 |
26.3 |
26.3 |
26.6 |
| LWL |
23.0 |
22.1 |
23.0 |
22.9 |
22.5 |
22.5 |
| Beam |
7.6 |
9.3 |
9.3 |
9.2 |
8.7 |
9.5 |
| Displacement |
3 |
6 |
4 |
4 |
4 |
6 |
| Ballast |
1 |
3 |
1 |
1 |
1 |
2 |
| Sail Area |
274 |
374 |
342 |
291 |
282 |
— |
| Performance |
| PHRF |
— |
— |
— |
— |
216 |
216 |
| SA/Disp |
17.5 |
16.9 |
20.4 |
16.4 |
17.0 |
— |
| Bal/Disp |
40.0 |
46.3 |
38.8 |
30.2 |
44.8 |
36.3 |
| Comfort |
17.0 |
22.8 |
14.7 |
16.2 |
16.0 |
— |
| Capsize |
1.93 |
1.97 |
2.26 |
2.18 |
2.13 |
— |
| Hull Speed |
6.4 |
6.3 |
6.4 |
6.4 |
6.4 |
— |