SB>1 Defiant technology in new testing
A new series of tests have been carried out on Sikorsky’s X2 Technology aircraft as part of work to improve the US Army’s aviation technology.
The testing, carried out by Sikorsky, Boeing and the US Combat Capabilities Development Command Aviation & Missile Center Army Aviation Development Directorate, supports the development of the SB>1 Defiant military helicopter being developed for the army’s Joint Multi-Role Technology Demonstrator (JMR TD) programme.
The X2 was put through wind tunnel testing to validate its aerodynamic performance and flight mechanics. These configurations, which are being used on the SB>1 Defiant, include a lift-offset coaxial rotor system, composite fuselage and rear-mounted pusher propulsor that provides increased speed.
The SB>1 Defiant is a technology demonstrator for a medium-lift utility helicopter. Future uses of this type of air vehicle could include attack and assault, troop transport or MEDEVAC.
In the testing a 1/5 scale model of the SB>1 airframe with powered coaxial main rotors was placed in a wind tunnel. Measurements included forces and moments on the various components, as well as fuselage, empennage and blade surface pressures.
The testing provided performance and handling qualities data that is now undergoing review and analysis.
The full-scale SB>1 Defiant flight demonstrator is currently undergoing ground and flight tests at Sikorsky’s flight test facility. The airframe will help the army develop requirements for new utility helicopters expected to enter service in the early 2030s.
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