The Bianca 27 is modestly canvassed and unhurried, 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 20.3′, the Bianca 27 tops out around 6.0 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √20.3′ LWL = 6.0 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
13.8
Modestly canvassed — a comfortable, unhurried cruiser.
Ballast / Displacement
44.6%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
381
Heavy displacement — a slow, steady, seakindly hull.
Comfort Ratio
31.0
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.66
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
581lbs
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
31.0
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
1.66
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 Bianca 27 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser 150–210
Heavy Cruiser 210–300
Cape Dory 27
222s/nm
Tartan 27
234s/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° |
2.2 |
2.8 |
3.1 |
3.2 |
| Close Reach60° |
2.6 |
3.3 |
3.7 |
3.9 |
| Beam Reach90° |
3.2 |
4.1 |
4.6 |
4.8 |
| Broad Reach120–135° |
3.0 |
3.8 |
4.2 |
4.4 |
| Run150–180° |
2.4 |
3.0 |
3.4 |
3.5 |
These are simplified estimates based on hull speed (6.0 kts),
SA/D (13.8), 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 Bianca 27 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–8 kts
8–24 kts
24–34 kts
34+ kts
Ghosting
0–8 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
8–24 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
24–34 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
34+ 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 Bianca 27.
|
Bianca 27 |
Cape Dory 27 |
Folkdancer 27 |
Halcyon 27 |
Tartan 27 |
Vega 27 Albin |
| Dimensions |
| LOA |
27.1 |
27.1 |
27.0 |
27.0 |
27.0 |
27.1 |
| LWL |
20.3 |
20.0 |
19.7 |
20.3 |
21.4 |
23.0 |
| Beam |
8.0 |
8.5 |
7.5 |
7.7 |
8.6 |
8.1 |
| Displacement |
7 |
7 |
5 |
6 |
7 |
5 |
| Ballast |
3 |
3 |
2 |
3 |
2 |
2 |
| Sail Area |
320 |
365 |
264 |
290 |
— |
296 |
| Performance |
| PHRF |
— |
222 |
— |
— |
234 |
— |
| SA/Disp |
13.8 |
15.3 |
14.4 |
13.1 |
— |
16.1 |
| Bal/Disp |
44.6 |
40.0 |
55.6 |
44.6 |
32.4 |
39.8 |
| Comfort |
31.0 |
30.3 |
24.3 |
30.9 |
— |
20.0 |
| Capsize |
1.66 |
1.74 |
1.75 |
1.63 |
— |
1.88 |
| Hull Speed |
6.0 |
6.0 |
5.9 |
6.0 |
— |
6.4 |