The heaviest object in the Steven F. Udvar-Hazy Center in Chantilly, Virginia, is undoubtedly the space shuttle Enterprise. The prize for most unwieldy, however, goes to a 700-pound, 121-foot flying wing, Pathfinder-Plus, a January addition to the Hazy collection. In August 1998, the solar/electric-powered, propeller-driven wing flew at a record 80,201 feet. (The highest altitude achieved by a propeller aircraft is 96,863 feet, reached in 2001 by Helios, a direct descendant of Pathfinder-Plus.).
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