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Sikorsky S-97 Raider Concept Light / Attack Helicopter (2020)

Authored By Staff Writer | Last Updated: 5/28/2015

The Sikorsky S-97 Raider, based on the impressive X-2 Technology Demonstrator, is in contention for the US Army Armed Aerial Scout helicopter program.

While helicopters have evolved since their mainstream inception in the 1950s, the "rotorcraft" has remained largely conventional and true to its roots. With the advent of the US Army's Armed Aerial Scout (AAS) program - intended to replace venerable Bell OH-58 Kiowa series - Sikorsky has responded with its S-97 "Raider" compound rotor concept. The S-97 incorporates a coaxial main rotor configuration, each mounting four blade assemblies, as well as a six-bladed "pusher" propeller in the tail to achieve stated program goals. The Sikorsky S-97 development is based on its award-winning "X-2" technology demonstrator and, in a militarized form, will be capable of strike, troop transport and fast reconnaissance sorties on the modern battlefield. The Sikorsky product includes a bevy of industry names including Northrop Grumman, BAe Systems, Honeywell, Garmin, Goodrich, Esterline, Kamatics, Hamilton Sundstrand and Ametek among others.

The US Army revealed its AAS program in March of 2010 to which Sikorsky reacted with their S-97 program in October. Prior to the announcement, Sikorsky garnered a great deal of data from its one-off, two-seat X-2 prototype serving as a technology demonstrator and powered by a single LHTEC T800-LHT-801 series turboshaft engine of 1,300shp to 1,800shp output. First flight of the type was recorded on August 27th, 2008 with evaluations running until July 14th, 2011 to which the aircraft has since been retired from operation. The X-2 concept proved high-speed coaxial rotor flight as a sound viable propulsion method for helicopters and recorded a maximum speed of 299 miles per hour (an unofficial record for a compound helicopter) with cruise speeds at 288mph (250 knots) while sporting an efficient operational range of 808 miles on internal fuel stores. On May 4th, 2009, a Light Tactical Helicopter mock-up was showcased based on the X-2 technology.

As it stands today (2013), the S-97 prototype design incorporates the General Electric T700 turboshaft engine which would eventually be replaced by a more potent offering from the "Improved Turbine engine Program" (ITEP) in time, promising better performance and higher output. As in the X-2 before it, the Raider will utilized a twin main rotor system each fielding four composite blades and coupled to a split-torque transmission system. The powerplant will also drive a six-bladed propeller assembly (arranged in a "pusher" configuration) at the rear of the design for the high-speed flight requirement. Composites will also be utilized throughout the construction of the fuselage as a weight savings measure. The undercarriage will be wholly retractable for a more "stealthy" in-flight profile. The empennage will sport a pair of outward cranked vertical tail fins emanating from short horizontal planes as well as a centralized ventral rudder ahead of the trailing propeller. Tracking and targeting systems will be mounted to a chin fairing and the cockpit will sport digital fly-by-wire controls for precision handling and force-feedback with much of the available functionality being installed directly to the primary flight stick. Autonomous flight will be built into the design while a standard operating crew of two pilots (seated side-by-side) will be normal. A midships cabin will be featured aft of the cockpit and showcase seating for six combat infantry. Entry/exit of the cabin will be by a rectangular sliding doors fitted one to each fuselage side. The pilots will enter/exit through hinged automobile-style doors and sit behind wide-angle canopy glass.

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Specifications for the
Sikorsky S-97 Raider
Concept Light / Attack Helicopter

Focus Model: Sikorsky S-97 Raider
Country of Origin: United States
Manufacturer: Sikorksy Aircraft - USA
Initial Year of Service: 2020
Production Total: 2

Crew: 2 + 6

Length: 36.09 ft (11 m)
Width: 32.81 ft (10.00 m)
Height: 0.00ft (0.00 m)
Weight (Empty): 8,951 lb (4,060 kg)
Weight (MTOW): 11,023 lb (5,000 kg)

Powerplant: 1 x General Electric T700 turboshaft engine driving 2 x four-bladed coaxial main rotors and a six-bladed tail rotor in pusher configuration.

Maximum Speed: 253 mph (407 kmh; 220 kts)
Maximum Range: 354 miles (570 km)
Service Ceiling: 10,007 ft (3,050 m; 1.9 miles)
Rate-of-Climb: 0 feet-per-minute (0 m/min)

Hardpoints: 2
Armament Suite:
PROPOSED (on external fuselage wingstubs):
Machine Gun Pods (7.62mm or 12.7mm)
Rocket Pods (2.75")
Hellfire Anti-Tank Missiles

S-97 "Raider" - Sikorsky company designation; based on the X-2 concept.

United States (possible)