Sikorsky–Boeing SB-1 Defiant
EXPERIMENTAL GYRODYNE BY SIKORSKY AND BOEING
Sikorsky/Boeing SB-1 Defiant; Sikorsky-Boeing SB-1; SB-1 Defiant; Sikorsky-Boeing SB-1 Defiant; Sikorsky S-100; Sikorsky S-100 Defiant; Sikorsky–Boeing Defiant X; Sikorsky–Boeing SB-1 Defiant X; Defiant X; Sikorsky-Boeing Defiant X; Sikorsky-Boeing SB-1 Defiant X
The Sikorsky–Boeing SB-1 Defiant (stylized as "SB>1"; company designation S-100) is the Sikorsky Aircraft and Boeing entry for the United States Army's Future Vertical Lift program, succeeding the Joint Multi-Role (JMR) initiative. It is a compound helicopter with rigid coaxial rotors, powered by two Honeywell T55 turboshaft engines; it first flew on 21 March 2019.