The Sikorsky-Boeing SB-1 Defiant helicopter is one of two candidates for the right to become the main helicopter of the US Army to replace the outdated UH-60 Black Hawk. During a recent test flight, he was able to accelerate to a speed of 383 km / h. For comparison, its predecessor develops a maximum of 358 km / h and a cruising speed of 286 km / h. Defiant is designed to carry four crew members and up to twelve passengers.
A competitor to the SB-1 Defiant in the Long-Range Army Aviation Development Program (FLRAA) is the Bell V-280 Valor tiltrotor. Program managers will have to select a new medium helicopter that will replace the aforementioned UH-60M Black Hawk and the AH-64E Apache attack helicopter. FLRAA starts in 2022 and ends in early 2030, when the new vehicle is put into service.
The main requirements of the army for the new helicopter are a higher flight speed and range compared to outdated models, in connection with which the participants in the competition have already proposed a number of new technological solutions.
In particular, the Sikorsky-Boeing SB-1 uses a set of two coaxial main rotor blades, complemented by a pusher tail rotor. As conceived by the developers, the "final" version of Defiant will fly at a speed of 530 km / h.
In turn, the Bell apparatus is a tiltrotor, similar to the V-22 Osprey, capable of turning its wing and propellers for vertical takeoffs, landings and horizontal flights.