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Sikorsky-Boeing: ground tests for the SB>1 Defiant helicopter
The first flight scheduled for 2019 -VIDEO
The US companies Boeing and Sikorsky (part of Lockheed Martin) published a video of the first ground tests on the SB>1 Defiant helicopter on their "Twitter" pages. The counter-rotating double-rotor coaxial aircraft produced jointly by the two companies is one of the two competing to replace the fleet of multi-role helicopters in use by the US Army, which will start to be replaced starting from 2030....
AVIONEWS - World Aeronautical Press Agency