Sikorsky-Boeing #SB1 Defiant Begins Ground Runs
The Sikorsky-Boeing #SB1 DEFIANT™ helicopter is advancing through its ground runs at the Sikorsky Development Flight Center in West Palm Beach, Flo...
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![Sikorsky Boeing - SB1 Defiant Future Vertical Lift Helicopter Simulation [1080p]](https://sun9-12.userapi.com/GE7yFYywz0ILu6ZEFa3r5b16L1AloI5avuIM_g/Ou0usZmS-Wg.jpg)
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