The plane has a four-pointed flying wing that rotates mid-flight to transition between super and subsonic flight, thus increasing efficiency and eliminating sonic booms.
Wings that work best for low speeds have a rounded front edge to generate lift, and are larger to provide more control surface. But there's little need for either at supersonic speeds, which work best with a sharper, flatter wings. The subsonic features hurt fuel efficiency and generate the sonic booms so unbeloved by residents of military training areas.
The plane will travel over 3,000 miles an hour, and could carry as many as 70 passengers.
The developer of the plane could get another $500,000 if the aircraft's early development is up to spec.
More info at http://www.theregister.co.uk/2012/08/31/nasa_flying_wing/
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