Defiant X Helicopter Specs: Will It Replace the UH-60 Black Hawk? Sikorsky-Boeing Defiant X helicopter The UH-threescore Black Hawk has been inwards service for xl years, in addition to the novel Sikorsky-Boeing Defiant X helicopter is ane of ii possible replacements. Using a coaxial rotor arrangement and a force propeller, the Defiant X can locomote at twice the speed of a Black Hawk. The helicopter too makes purpose of other technologies to increment its speed, range, together with survival capabilities. The Defiant X has twice the range too speed of the world's best helo. Here'second the Potentially More Terrifying Helicopter to Replace the Black Hawk. Lockheed Martin'sec Sikorsky too Boeing, the ii companies competing to supercede the UH-lx Black Hawk in the USA Army'sec inventory, have released the concluding specifications for their new helicopter. The Defiant X was made to supplant the Black Hawk. It tin locomote twice as fast too twice as far every bit the Bla...