The Bb11 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 13.5′, the Bb11 tops out around 4.9 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √13.5′ LWL = 4.9 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
15.1
Moderate sail power — a capable coastal cruiser, not overpowered.
Comfort Ratio
13.6
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
2.07
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
281lbs
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
13.6
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
2.07
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
PHRF Fleet Position
Where the Bb11 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser 150–210
Heavy Cruiser 210–300
Barnegat 20
228s/nm
Cal 20
258s/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° |
1.9 |
2.3 |
2.6 |
2.7 |
| Close Reach60° |
2.2 |
2.8 |
3.2 |
3.3 |
| Beam Reach90° |
2.7 |
3.5 |
3.9 |
4.0 |
| Broad Reach120–135° |
2.5 |
3.2 |
3.6 |
3.7 |
| Run150–180° |
2.0 |
2.6 |
2.9 |
3.0 |
These are simplified estimates based on hull speed (4.9 kts),
SA/D (15.1), 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 Bb11 — 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 Bb11.
|
Bb11 |
Barnegat 20 |
Cal 20 |
Dark Harbor 12 12 |
Flatfish |
Flying Fifteen |
| Dimensions |
| LOA |
20.3 |
20.1 |
20.0 |
20.2 |
20.3 |
20.0 |
| LWL |
13.5 |
18.0 |
18.0 |
12.5 |
16.1 |
15.0 |
| Beam |
5.8 |
7.0 |
7.0 |
5.3 |
7.5 |
7.0 |
| Displacement |
1 |
1 |
1 |
2 |
3 |
725 |
| Ballast |
606 |
— |
900 |
— |
— |
372 |
| Sail Area |
120 |
175 |
195 |
— |
266 |
142 |
| Performance |
| PHRF |
— |
228 |
258 |
— |
— |
— |
| SA/Disp |
15.1 |
23.0 |
20.0 |
— |
20.1 |
28.2 |
| Bal/Disp |
— |
— |
— |
— |
— |
51.3 |
| Comfort |
13.6 |
8.4 |
12.1 |
— |
18.8 |
5.1 |
| Capsize |
2.07 |
2.54 |
2.24 |
— |
2.06 |
3.12 |
| Hull Speed |
4.9 |
5.7 |
5.7 |
— |
5.4 |
5.2 |