DARPA VTOL X-Plane
There are four ambitious goals in the VTOL X-Plane program: top sustained flight speed of between 300 and 400 knots; hover efficiency of 75 percent (up from 60 percent); cruise efficiency, with a lift-to-drag ratio of at least 10 (up from 5 to 6); and the ability to carry a "useful load" of at least 40 percent of the aircraft’s projected gross weight of 10,000 to 12,000 pounds.
October 6, 2013 7:30 AM PDT
Photo by: DARPA
| Caption by: Jonathan Skillings
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