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Bb11
Designer: Borge Bringsvaerd  ·  Builder: Borge Bringsvaerd  ·  First built: 1956
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About the Bb11

With limited specifications available, the Bb11 represents a somewhat elusive entry in the sailing world, making it challenging to provide comprehensive details about its design philosophy and intended use. What information exists suggests this sailboat likely falls into the smaller vessel category, though without detailed dimensions or construction specifications, determining its exact sailing characteristics requires careful consideration of available context clues. Based on the naming convention and typical design patterns of similar boats, the Bb11 appears to be oriented toward recreational sailing rather than serious offshore passages. The compact nature implied by its designation suggests it would be most suitable for day sailing, coastal exploration, or as an entry-level cruising vessel for protected waters. Without comprehensive technical data, potential buyers should approach the Bb11 with additional research in mind, seeking out owner testimonials, surveyor reports, or manufacturer documentation to better understand its seaworthiness, build quality, and performance characteristics. The limited available specifications make it particularly important for prospective owners to conduct thorough inspections and sea trials before making purchasing decisions, ensuring the boat meets their specific sailing needs and expectations.

Core Dimensions
LOA (Length Overall) 20.28 ft / 6.18 m
LWL (Waterline Length) 13.45 ft / 4.10 m
Beam 5.84 ft / 1.78 m
Max Draft 3.22 ft / 0.98 m
Displacement 1,433.00 lb / 650 kg
Ballast 606.00 lb / 275 kg
Sail Area (Reported) 120.00 ft² / 11.15 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Fractional Sloop
Construction Wood - carvel (mahogany on oak)
Designer Borge Bringsvaerd
Builder Borge Bringsvaerd
First Built 1956
Last Built 1968
Owner Reviews

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Known Issues & What to Watch For

No known issues documented for this model yet.

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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
15.14
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
13.61
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
2.07
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 4.91
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 280.66
How It Compares

vs. Cal 20, Dark Harbor 12 12, Flatfish

This boat Similar boats
Dimensions
LOA
Bb11 ★
20.3 ft
Cal 20
20.0 ft
Dark Harbor 12 12
20.2 ft
Flatfish
20.3 ft
LWL
Bb11 ★
13.5 ft
Cal 20
18.0 ft
Dark Harbor 12 12
12.5 ft
Flatfish
16.1 ft
Beam
Bb11 ★
5.8 ft
Cal 20
7.0 ft
Dark Harbor 12 12
5.3 ft
Flatfish
7.5 ft
Displacement
Bb11 ★
1 lbs
Cal 20
1 lbs
Dark Harbor 12 12
2 lbs
Flatfish
3 lbs
Ballast
Bb11 ★
606 lbs
Cal 20
900 lbs
Dark Harbor 12 12
Flatfish
Sail Area
Bb11 ★
120 sq ft
Cal 20
195 sq ft
Dark Harbor 12 12
Flatfish
266 sq ft
Performance
SA / Displacement (higher = more powerful)
Bb11 ★
15.1
Cal 20
20.0
Dark Harbor 12 12
Flatfish
20.1
Comfort Ratio (higher = more comfortable offshore)
Bb11 ★
13.6
Cal 20
12.1
Dark Harbor 12 12
Flatfish
18.8
Capsize Screening (lower = safer)
Bb11 ★
2.07
Cal 20
2.24
Dark Harbor 12 12
Flatfish
2.06
Displacement / Length (lower = lighter)
Bb11 ★
Cal 20
Dark Harbor 12 12
457
Flatfish
332
Hull Speed
Bb11 ★
4.9 kts
Cal 20
5.7 kts
Dark Harbor 12 12
Flatfish
5.4 kts
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