The ''Chrysalis'' was a human-powered

biplane A biplane is a fixed-wing aircraft with two main wings stacked one above the other. The first powered, controlled aeroplane to fly, the Wright Flyer, used a biplane wing arrangement, as did many aircraft in the early years of aviation. While ...

, designed and built by graduates and undergraduates of the Massachusetts Institute of Technology, with Professor Eugene Larabee acting as Project Adviser. MIT had previously built two HPAs, the ''BURD'' and ''BURD II'', both of which were unsuccessful. Design work began in late 1978, with a 1/8th scale flying model being built to verify aspects of the design. The ''Chrysalis'' was a biplane of conventional configuration, fitted with a tractor propeller. The biplane's wire-braced wings were unstaggered, and the outboard panels of the lower wing were set with a 6° dihedral. The fuselage was of the pod-and-boom type. The aircraft had a primary structure of aluminum tubing, and a secondary structure made of styrofoam, balsa, and carbon fibre. The entire aircraft was covered in transparent Mylar film. The undercarriage had a single, castoring, monowheel. Lateral control was achieved by wing warping, with directional and pitch control being achieved by the all-flying tailfin and tailplane. Construction of the aircraft took 91 days, and involved 20 people and 3,500 hours of work. It first flew on June 5, 1979, at Hanscom Field airport in Bedford, Massachusetts with designer Harold Youngren piloting the craft. Between then and its dismantling in September, the ''Chrysalis'' made a total of 345 flights, with 44 different pilots. The ''Chrysalis'' was notable for being the first aircraft to use a 'minimum induced loss' propeller, the design of which was based on the work of Professor Eugene Larrabee. The MIT team also built the propeller used by the MacCready ''Gossamer Albatross''.

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