Sikorsky–Boeing SB-1 Defiant

SB-1 Defiant
Flight demonstration in February 2020
Role Compound helicopter
National origin United States
Manufacturer Sikorsky Aircraft / Boeing
First flight 21 March 2019
Status Canceled

The Sikorsky–Boeing SB-1 Defiant (stylized as "SB>1"; company designation S-100) was the Sikorsky Aircraft and Boeing entry for the United States Army's Future Long-Range Assault Aircraft program to replace the Sikorsky UH-60 Black Hawk. It is a compound helicopter with rigid coaxial rotors, powered by two Honeywell T55 turboshaft engines; it first flew on 21 March 2019.

In December 2022, the U.S. Army selected the rival Bell V-280 Valor as the winner of the Future Long-Range Assault Aircraft program.

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