The Sikorsky-Boeing SB-1 Defiant was a revolutionary coaxial rotor helicopter designed to replace the legendary Black Hawk in the U.S. Army’s Future Vertical Lift program. Featuring twin counter ...

All-new sub-250g Coaxial nano drone fills a durability and ... in realizing that vision," said David Smith, CEO of Robinson Helicopter Company. With an MSRP of $4,499, HELIUS is available for ...