Sikorsky S-97 RAIDER begins ground testing

Sikorsky's 100% industry-funded S-97 RAIDER military helicopter features coaxial counterrotating main rotors and a pusher propeller and can fly as fast as 220 knots.

Sikorsky Aircraft Corp. (Stratford, CT, US), a subsidiary of United Technologies Corp., announced on Feb. 4 the start of bladed ground testing, a major milestone, for the S­-97 RAIDER program. The RAIDER is an armed reconnaissance rotorcraft designed to significantly outmatch conventional military helicopters in maneuverability, payload, speed, range and high/hot environmental conditions.

"Testing all of the aircraft's systems together, for the first time, marks significant progress in the development of this next generation helicopter and moves the program closer to first flight," says S-­97 RAIDER program manager Mark Hammond.

During the ground runs phase, the S-­97 RAIDER team is testing the first of two aircraft prototypes as a completed system for the first time. The team will perform initial ground tests with the aircraft tied down and will focus on verifying correct operation of the propulsion system, drive train, rotor control system and pilot­ vehicle interface.

This testing comes on the heels of the recent successful completion of software qualification testing, component fatigue testing, and gearbox testing, for the first S-­97 RAIDER prototype. Sikorsky launched the S­-97 RAIDER program in October 2010 with the objectives of maturing the X2 rotorcraft design and offering a helicopter to meet U.S. Army reconnaissance and special operations needs.

In addition to ground runs for the first prototype, the program team at Sikorsky's Development Flight Center in West Palm Beach, FL, US, is prepared to begin final assembly of the second prototype S-­97 RAIDER helicopter, following acceptance last month of the fuselage structure from Aurora Flight Sciences. Sikorsky rolled out the first prototype in October 2014.

Based on Sikorsky's rigid X2 rotor coaxial design, the S­-97 RAIDER features next-generation technologies in a multi­mission configuration, capable of carrying six troops and external weapons. The coaxial counter­rotating main rotors and pusher propeller provide cruise speeds up to 220 knots.

The S-­97 RAIDER helicopter demonstrator program is 100% industry­-funded. Sikorsky provides 75% of the investment while suppliers provide balance. Sikorsky's goal is to attract government interest in the program.