Sikorsky S-97 Raider

The Sikorsky S-97 Raider is an advanced scout and attack compound helicopter developed by Sikorsky Aircraft, employing the Advancing Blade Concept (ABC) with a coaxial rotor system.

This innovative helicopter is currently under development and aims to meet various military needs, including the potential replacement for the U.S. Army’s Armed Aerial Scout program.

The Sikorsky S-97 Raider was proposed in response to the United States Army’s request for information for the Armed Aerial Scout (AAS) program in March 2010. Officially launched on October 20, 2010, it was designed as a contender to replace the Bell OH-58D Kiowa Warrior.

The S-97’s design incorporates variable-speed rigid coaxial main rotors and a variable-pitch pusher propeller, making it a compound helicopter. Notable features include fly-by-wire control, dynamic anti-vibration actuators, and advanced rotor design for improved handling and efficiency. The helicopter is designed for increased maneuverability, with the ability to tilt the coaxial rotors and employ a variable-pitch propulsor. The S-97 can carry up to six passengers and is projected to have autonomous flight capabilities.

Powering the prototype S-97s is the General Electric YT706 turboshaft engine, with future plans to incorporate a more powerful engine under the Improved Turbine Engine Program. The S-97 aims for high performance goals, including cruising speeds exceeding 200 knots while carrying weapons and high hover efficiency.