Sikorsky-Boeing SB-1 Defiant helicopter

The Sikorsky-Boeing SB-1 Defiant is a compound helicopter being developed by Sikorsky Aircraft and Boeing for the United States Army's Future Vertical Lift program.

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Previously:

https://www.homemadetools.net/forum/...167#post149737
https://www.homemadetools.net/forum/...285#post134952
https://www.homemadetools.net/forum/...637#post102089

Sikorsky-Boeing SB-1 Defiant helicopter - GIF