Sikorsky, and partner Boeing, are proving the scalability and tailorability of Sikorsky's Collier award-winning X2 Technology™
through SB>1 DEFIANT™. Being developed for the U.S. Army's joint multi-role technology demonstration program,
this medium-class technology demonstrator will help inform the next generation of military helicopters.

Sikorsky–Boeing SB-1 Defiant "2019"

RoleCompound helicopter
National originUnited States
ManufacturerSikorsky Aircraft / Boeing
First flight21 March 2019[1]
StatusUnder development

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Sikorsky–Boeing SB-1 Defiant

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Sikorsky–Boeing SB-1 Defiant "2021"

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 T55s, and made its first flight on 21 March 2019.

Sikorsky Aircraft and Boeing are jointly producing a medium-lift-sized demonstrator they named SB>1 Defiant (also widely known as “SB-1”) for phase one of the program. Originally planned to fly in late 2017, its first flight was delayed in April 2017 to early 2018. Once flight testing begins, the aircraft will be evaluated by the Army for further development. Sikorsky is leading the development of phase one with an aircraft based on their previous Sikorsky X2 design.



Sikorsky and Boeing state the design is to have a cruise speed of 250 kn (290 mph; 460 km/h), but less range due to using the “old” T55 engine. A new engine, the Future Affordable Turbine Engine (FATE), is to meet the radius requirement of 229 nmi (264 mi; 424 km). Compared to conventional helicopters, the counter-rotating coaxial main rotors and pusher propeller offer a 100-knot (115 mph; 185 km/h) speed increase, a 60% combat radius extension, and 50% better performance in high-hot hover performance.

Sikorsky has said that the X2 design is not suitable for heavy-lift size, and instead suggests the CH-53K for heavy-lift and tiltrotor for the ultra-class. However, Sikorsky plans to build the 30,000-pound-class (14,000 kg) JMR-TD (with a cabin 50% larger than the Black Hawk) at full scale to remove doubts about the scalability of the X-2 technology.

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The first prototype was unveiled in December 2018, and the first flight was pushed to sometime in early 2019. Ground runs began in January 2019; 15 hours of ground tests were needed before the first flight.

The first flight took place on 21 March 2019 at Sikorsky West Palm Beach site in Florida. In the summer of 2019, flights were suspended to address a bearing issue with the main rotor. Flight testing resumed 24 September 2019. The aircraft reached a speed of 211 knots during level flight in October 2020. By December 2020, the demonstrator had logged 26 flight hours in 31 flights over the 21 months since first flight.[


max. Startmasse> 13.600 kg
Reisegeschwindigkeit250 kts (463 km/h)
max. Schwebeflughöhe6000 ft bei 35 °C (1800 m)
Reichweite229 NM (424 km)
Triebwerkezwei Honeywell T55

Aircrafttoaal encyclopedia

Utility helicopters like the Future Long-Range Attack and Assault (FLRAA) aircraft fly low and fast, land quickly, deliver Soldiers and get out — all while evading the enemy in complex terrain. Sikorsky and partner Boeing have created an agile, maneuverable weapon system that flies twice as far and twice as fast as the Black Hawk