The Bb 10 is well-powered with enough sail area to move in light air, 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 23.9′, the Bb 10 tops out around 6.6 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √23.9′ LWL = 6.6 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
19.2
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Ballast / Displacement
54.5%
Race-oriented ballast ratio — very stiff and powerful.
Displacement / Length
162
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
19.5
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
1.77
Below the 2.0 offshore threshold — acceptable for ocean passages.
SA/Disp (Calculated)
19.8
Computed from measured I/J/P/E rather than reported sail area.
Pounds/Inch Immersion
645lbs
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
19.5
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
1.77
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° |
2.8 |
3.5 |
3.9 |
4.1 |
| Close Reach60° |
3.4 |
4.2 |
4.7 |
4.9 |
| Beam Reach90° |
4.1 |
5.2 |
5.8 |
6.3 |
| Broad Reach120–135° |
3.8 |
4.8 |
5.4 |
5.8 |
| Run150–180° |
3.0 |
3.8 |
4.3 |
4.5 |
These are simplified estimates based on hull speed (6.6 kts),
SA/D (19.2), 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 Bb 10 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–6 kts
6–20 kts
20–30 kts
30+ kts
Ghosting
0–6 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
6–20 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
20–30 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
30+ 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 Bb 10.
|
Bb 10 |
Asso 99 |
Cc 33 |
Contention 33 Peterson |
Oe 33 |
X 34 Ton |
| Dimensions |
| LOA |
32.8 |
32.7 |
32.9 |
32.8 |
32.8 |
32.8 |
| LWL |
23.9 |
— |
26.4 |
28.5 |
26.9 |
25.6 |
| Beam |
7.6 |
9.7 |
10.5 |
10.4 |
9.0 |
11.1 |
| Displacement |
4 |
2 |
9 |
9 |
8 |
7 |
| Ballast |
2 |
1 |
4 |
4 |
3 |
— |
| Sail Area |
348 |
473 |
502 |
490 |
441 |
543 |
| Performance |
| SA/Disp |
19.2 |
— |
17.6 |
17.8 |
17.2 |
22.8 |
| Bal/Disp |
54.5 |
— |
41.6 |
— |
44.8 |
— |
| Comfort |
19.5 |
6.2 |
23.3 |
21.4 |
24.2 |
16.9 |
| Capsize |
1.77 |
— |
1.97 |
1.98 |
1.78 |
2.27 |
| Hull Speed |
6.6 |
7.1 |
6.9 |
7.2 |
7.0 |
6.8 |