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|LOA||3.632 m (11 ft 11.0 in)|
|Beam||1.372 m (4 ft 6.0 in)|
|Draft||.660 m (2 ft 2.0 in)|
|Hull weight||61 kg (130 lb)|
|Mast height||5.486 m (18 ft 0 in)|
|Mainsail area||6.967 m2 (74.99 sq ft)|
The Butterfly is a one-design sailing dinghy, originally designed for a crew of two, but now most commonly raced single-handed. It was designed in 1961 in Libertyville, Illinois by John Barnett. The 12-foot hull is a scow design. The craft has an 18-foot mast and a single mainsail with a 75 square-foot surface area.
- National Butterfly Association: boat specifications and class history.