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Butterfly
Designer: John Barnett  ·  Builder: Barnett Boats (Usa)  ·  First built: 1961
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About the Butterfly

Designed by John Barnett in 1961, this compact catboat represents one of the most successful small boat designs in sailing history, with over 10,750 hulls produced by Barnett Boats USA. The Butterfly's scow hull configuration with a single centerboard creates an exceptionally stable and forgiving platform that has made it a favorite for sailing instruction and recreational day sailing. At just 12 feet overall with a 4.5-foot beam, this fiberglass sailboat offers remarkable stability for its size, evidenced by its moderate capsize screening formula of 3.49. The simple catboat rig eliminates the complexity of a jib, making it ideal for beginning sailors while still providing spirited performance with its sail area to displacement ratio of 45.18. The Butterfly excels in protected waters, lakes, and coastal areas where its shallow 2.33-foot draft allows exploration of thin water that deeper boats cannot access. Its 137-pound displacement makes it easily car-toppable, while the straightforward rigging system means quick setup at the launch ramp. This design's enduring popularity stems from its blend of simplicity, safety, and fun sailing characteristics, making it equally suitable for yacht club training programs, family recreation, or solo adventures in moderate conditions.

Core Dimensions
LOA (Length Overall) 12.00 ft / 3.66 m
Beam 4.50 ft / 1.37 m
Max Draft 2.33 ft / 0.71 m
Min Draft 1.25 ft / 0.38 m
Displacement 137.00 lb / 62 kg
Sail Area (Reported) 75.00 ft² / 6.97 m²
Design & Construction
Hull Type Scow Sngl. Cbrd.
Rigging Type Cat (Marconi)
Construction FG
Designer John Barnett
Builder Barnett Boats (USA)
First Built 1961
Number Built 10750
Associations Butterfly Class Site
Related Sailboats Hobie Bravo · Byte · Firefly · Aqua Cat 12 · Hobie One 12
Owner Reviews

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Performance Ratios
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
57.63
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
2.64
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. 4.28 kn
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. 0.98 pounds/inch
How It Compares

vs. Aqua Cat 12, Byte, Firefly, Hobie Bravo, Hobie One 12

This boat Similar boats
Dimensions
LOA
Butterfly ★
12.0 ft
Aqua Cat 12
12.2 ft
Byte
12.0 ft
Firefly
12.0 ft
Hobie Bravo
12.0 ft
Hobie One 12
12.0 ft
LWL
Butterfly ★
Aqua Cat 12
11.8 ft
Byte
10.5 ft
Firefly
11.8 ft
Hobie Bravo
Hobie One 12
10.2 ft
Beam
Butterfly ★
4.5 ft
Aqua Cat 12
6.5 ft
Byte
4.3 ft
Firefly
4.7 ft
Hobie Bravo
4.4 ft
Hobie One 12
5.0 ft
Displacement
Butterfly ★
137 lbs
Aqua Cat 12
160 lbs
Byte
99 lbs
Firefly
260 lbs
Hobie Bravo
195 lbs
Hobie One 12
125 lbs
Sail Area
Butterfly ★
75 sq ft
Aqua Cat 12
90 sq ft
Byte
58 sq ft
Firefly
Hobie Bravo
86 sq ft
Hobie One 12
Performance
SA / Displacement (higher = more powerful)
Butterfly ★
Aqua Cat 12
48.9
Byte
43.4
Firefly
Hobie Bravo
41.0
Hobie One 12
Comfort Ratio (higher = more comfortable offshore)
Butterfly ★
2.6
Aqua Cat 12
Byte
2.0
Firefly
Hobie Bravo
3.9
Hobie One 12
Capsize Screening (lower = safer)
Butterfly ★
Aqua Cat 12
Byte
3.68
Firefly
Hobie Bravo
3.05
Hobie One 12
Displacement / Length (lower = lighter)
Butterfly ★
57
Aqua Cat 12
Byte
38
Firefly
71
Hobie Bravo
82
Hobie One 12
52
Hull Speed
Butterfly ★
4.3 kts
Aqua Cat 12
Byte
4.3 kts
Firefly
Hobie Bravo
4.3 kts
Hobie One 12
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