This unusual Sikorsky-Boeing helicopter just made its first flight - CNET
The SB>1 Defiant has not one but two rotors on top, and in the rear, a pusher propeller designed to give it high-speed flight.
from CNET https://ift.tt/2JyhWBY
via Mobiles
from CNET https://ift.tt/2JyhWBY
via Mobiles
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