| Flight test (5) |  |
"Successful flight tests have not only demonstrated its hovering capabilities during its vertical takeoff--the way a helicopter does
"During the flight tests we successfully transitioned from hover to wing-borne flight like a conventional airplane then back to hover again.
NASA Drone Advances Unmanned Craft A huge, 10-engine drone dubbed"Greased Lightning"successfully completed a series of flight tests recently,
"Over the course of five flight tests, the drone was able to take off and hover like a helicopter,
After initial test flights in 2011 an updated version was shown off recently at the Paris airshow.
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