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Bonin 34
Designer: Cossutti/Bonin  ·  Builder: Bonin (Ita)  ·  First built: 2001
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About the Bonin 34

Designed by the renowned Cossutti/Bonin partnership and built by Italy's Bonin shipyard beginning in 2001, this 34-footer represents European performance cruising at its finest. The collaboration between these respected names produced a sleek masthead sloop that balances spirited sailing characteristics with practical cruising capabilities. The fin keel and spade rudder configuration, combined with a relatively light displacement of 9,039 pounds, creates a responsive boat that rewards active sailing. With a sail area to displacement ratio of 19.5, the Bonin 34 offers excellent light-air performance while maintaining control in stronger conditions. The generous beam of nearly 12 feet provides good interior volume and contributes to stability underway. This Italian-built yacht excels in coastal cruising and weekend racing scenarios where performance matters. The comfort ratio of 16.59 indicates a boat that prioritizes sailing ability over heavy-weather comfort, making it ideal for Mediterranean conditions and similar sailing environments. The capsize screening value of 2.27 suggests reasonable offshore capability for experienced crews, though the design clearly favors performance over ultimate seaworthiness. Hull speed calculations indicate the boat can achieve 7.44 knots under ideal conditions, reflecting the efficient waterline length and fine entry typical of modern European designs.

Core Dimensions
LOA (Length Overall) 32.78 ft / 9.99 m
LWL (Waterline Length) 30.84 ft / 9.40 m
Beam 11.81 ft / 3.60 m
Max Draft 6.73 ft / 2.05 m
Min Draft 5.91 ft / 1.80 m
Displacement 9,039.00 lb / 4,100 kg
Ballast Type Lead
Sail Area (Reported) 527.00 ft² / 48.96 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Cossutti/Bonin
Builder Bonin (ITA)
First Built 2001
Related Sailboats ["Salona 34" · "Jpk 1010" · "Sun Fast 3300 Jeanneau" · "Ker 33" · "X 99"]
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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
 19.5
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
 137.57
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
 16.59
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
 2.27
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. 7.44 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 3.93
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. 1,301.40 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 19.5
Rig Dimensions
I (Foretriangle Height) 42.98 ft / 13.10 m
J (Foretriangle Base) 12.96 ft / 3.95 m
P (Mainsail Luff) 36.09 ft / 11.00 m
E (Mainsail Foot) 13.78 ft / 4.20 m
SA Fore 278.51 ft² / 25.87 m²
SA Main 248.66 ft² / 23.10 m²
SA Total (100%) 527.17 ft² / 48.98 m²
Est. Forestay Length 44.89 ft / 13.68 m
Engine & Accommodations
Engine Make Yanmar
Engine Type Diesel
Fuel Capacity 21 gals / 79 L
Water Capacity 50 gals / 189 L
How It Compares

vs. Jpk 1010, Ker 33, Sun Fast 3300 Jeanneau

This boat Similar boats
Dimensions
LOA
Bonin 34 ★
32.8 ft
Jpk 1010
32.8 ft
Ker 33
32.8 ft
Sun Fast 3300 Jeanneau
32.8 ft
LWL
Bonin 34 ★
30.8 ft
Jpk 1010
28.7 ft
Ker 33
32.8 ft
Sun Fast 3300 Jeanneau
30.5 ft
Beam
Bonin 34 ★
11.8 ft
Jpk 1010
11.1 ft
Ker 33
12.0 ft
Sun Fast 3300 Jeanneau
11.2 ft
Displacement
Bonin 34 ★
9 lbs
Jpk 1010
8 lbs
Ker 33
8 lbs
Sun Fast 3300 Jeanneau
7 lbs
Ballast
Bonin 34 ★
—
Jpk 1010
3 lbs
Ker 33
3 lbs
Sun Fast 3300 Jeanneau
3 lbs
Sail Area
Bonin 34 ★
527 sq ft
Jpk 1010
624 sq ft
Ker 33
521 sq ft
Sun Fast 3300 Jeanneau
570 sq ft
Performance
SA / Displacement (higher = more powerful)
Bonin 34 ★
19.5
Jpk 1010
24.3
Ker 33
20.5
Sun Fast 3300 Jeanneau
23.3
Ballast / Disp (higher = stiffer)
Bonin 34 ★
—
Jpk 1010
43.4 %
Ker 33
—
Sun Fast 3300 Jeanneau
41.4 %
Comfort Ratio (higher = more comfortable offshore)
Bonin 34 ★
16.6
Jpk 1010
17.5
Ker 33
14.3
Sun Fast 3300 Jeanneau
15.3
Capsize Screening (lower = safer)
Bonin 34 ★
2.27
Jpk 1010
2.19
Ker 33
2.37
Sun Fast 3300 Jeanneau
2.26
Displacement / Length (lower = lighter)
Bonin 34 ★
137
Jpk 1010
157
Ker 33
—
Sun Fast 3300 Jeanneau
121
Hull Speed
Bonin 34 ★
7.4 kts
Jpk 1010
7.2 kts
Ker 33
7.7 kts
Sun Fast 3300 Jeanneau
7.4 kts
Speed Number (higher = faster)
Bonin 34 ★
3.9
Jpk 1010
—
Ker 33
4.7
Sun Fast 3300 Jeanneau
—
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