Design and Development of the Main Rotor Gearbox for the Sikorsky Boeing SB>1 DEFIANT JMR Technology Demonstrator Aircraft

The Sikorsky Boeing SB>1 DEFIANT is a technology demonstrator aircraft that is being built under the Joint Multi-Role Technology Demonstrator (JMR TD) program to address the next generation performance requirements of the Future Vertical Lift program which is led by the US Army. The design and development of the main rotor gearbox (MRGB) on the SB>1 DEFIANT Technology Demonstrator incorporated a number of lower TRL technologies and innovative design solutions to meet challenging technical requirements imposed by a generational leap in vehicle performance. The SB>1 DEFIANT main rotor drive system (MRDS) configuration is summarized with an account of advanced technologies incorporated and ground testing performed to successfully incorporate low TRL technologies in a flight vehicle that breaks performance barriers.