| The Scaled Composites Model 281 Proteus is a tandem-wing high-endurance aircraft designed by Burt Rutan to investigate the use of aircraft as high altitude telecommunications relays. The Proteus is actually a multimission vehicle, able to carry various payloads on a ventral pylon. An extremely high-efficiency design, the Proteus can orbit a point at over 65,000 feet for more than 18 hours. This model was used in Popular Science Michael Speigner
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