SB> 1Defiant high-speed combat helicopter prototype begins testing

The prototype of the SB> 1 Defiant, the new generation helicopter from Sikorsky-Boeing opposed to the Bell V-280 Valor in partnership with Lockheed, began ground tests at the start of the year, foreshadowing future air tests. Derived from the X2 and S-97 demonstrators, the Defiant uses a counter-rotating rotor and a propeller ...

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