US military plans to replacelong-range attack helicopter (FLRAA) UH-60 Black Hawk. Within the framework of this project, two helicopters compete: the V-280 Valor tiltrotor developed by Bell and the SB-1 Defiant prototype created as a result of a joint project by Sikorsky and Boeing.
As a result of the refinement and consideration of military comments after the first test flight of the SB-1 Defiant in 2019, Sikorsky and Boeing presented an improved model of the Defiant-X helicopter.
Despite the secrecy during thepresentation, the journalists were able to get an initial idea of the new helicopter, designed to replace the legendary Black Hawk, flying since the Cold War.
First of all, in the Defiant-X model, constructorsprovided for the installation of a front wheel, which was not in the SB-1 Defiant. As a result, the car received greater stability and stability when landing in extreme conditions. The geometry of the hull was also changed - the protruding exhaust hole, which, according to the military, contributed to the appearance of a clear "heat trace" of the helicopter, was removed.
The aerodynamic parameters of the helicopter have also been changed,by creating a sharper nose and a pronounced ridge at the back. Meanwhile, the layout of engines and propellers in the Defiant-X remained the same as in the previous prototype SB-1 Defiant: there are two coaxial main rotor and a push rotor in the tail section. During the presentation, the developers did not indicate the speed parameters of the Defiant-X, which are one of the defining characteristics when the military determines the winner in the competition between Bell and Sikorsky's partners with Boeing.