Boeing Aircraft

The Sikorsky-Boeing SB-1 Defiant (stylized as "SB>1") is the Sikorsky Aircraft and Boeing entry for the United States Army's Future Vertical Lift program.

Sikorsky-Boeing SB-1 Defiant

The design will 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 range requirement of 229 nmi (264 mi; 424 km). Compared to conventional helicopters, the counter-rotating coaxial main rotors and pusher propeller offer a 185 km/h (115 mph) speed increase, combat radius extended by 60%, and performs 50% better 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 lb-class 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.

 

Sikorsky-Boeing states the SB-1 will be quick and nimble, with fast acceleration and deceleration, side-to-side movement, and hovering with the tail up and nose down. The Defiant demonstrator will be powered by the Honeywell T55, which powers the CH-47 Chinook. It will be slightly modified to better operate at slower speeds down to 85% rpm.

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Sikorsky Aircraft and Boeing are jointly producing a medium-lift-sized demonstrator they call 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.[5] 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.

Boeing
Sikorsky-Boeing SB-1 Defiant

The Sikorsky-Boeing SB-1 Defiant (stylized as "SB>1") is the Sikorsky Aircraft and Boeing entry for the United States Army's Future Vertical Lift program, succeeding the Joint Multi-Role initiative. It is a compound helicopter with rigid coaxial rotors, powered by two Honeywell T55s, and should make its first flight in 2018.

 

  • History

    Role  Compound helicopter

    National origin  United States

    Manufacturer  Boeing / Sikorsky Aircraft

    Status  Under development

  • Primary Users

    Primary users  United States Army

    Japan Ground Self-Defense Force

    Royal Netherlands Air Force

  • General Info

    Produced  1962–present

    Number built  Over 1,200 as of 2012

    Unit cost

    US$38.55 million (CH-47F, FY13)

    Developed from  Vertol Model 107

    Variants  Boeing Chinook (UK variants)

Sikorsky-Boeing SB-1 Defiant

Aircrafttotaal

The Sikorsky-Boeing SB-1 Defiant (stylized as "SB>1") is the Sikorsky Aircraft and Boeing entry for the United States Army's Future Vertical Lift program, succeeding the Joint Multi-Role initiative. It is a compound helicopter with rigid coaxial rotors, powered by two Honeywell T55s, and should make its first flight in 2018.

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