Sikorsky Helicopter

The Sikorsky S-97 Raider is a high-speed scout and attack compound helicopter based on the Advancing Blade Concept (ABC).

Sikorsky S-97 Raider

Design and development

The S-97 design includes variable speed rigid coaxial main rotors and a variable-pitch pusher propeller, making the S-97 a compound helicopter. Like the X2, it has fly-by-wire control and dynamic anti-vibration actuators to cancel out shaking. The main rotors have hingeless hubs and stiff blades, to improve low-speed handling and efficiency of hover. At high speeds, the close spacing of the hubs reduces drag.The stiff blades allow each rotor to have low lift on the retreating side of its rotor disk (reducing drag), whereas each rotor on a conventional coaxial rotor with "floppy" blades needs nearly equal lift distribution. The propeller relieves the rotor of propulsion, further reducing drag.

 

Maneuverability is improved compared with earlier helicopters because of the ability to tilt the coaxial rotors together or tilt each one differently, and because of the variable pitch propulsor and active elevons At low speed the S-97 maneuvers by differential torque of the upper and lower rotor, at high speed it uses rudders

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Sikorsky Helicopter
Sikorsky S-97 Raider

The Sikorsky S-97 Raider is a high-speed scout and attack compound helicopter based on the Advancing Blade Concept (ABC), under development by Sikorsky Aircraft. Sikorsky planned to offer it for the United States Army's Armed Aerial Scout program, along with other possible uses. The S-97 made its maiden flight on 22 May 2015

Sikorsky S-79 Raider Specifications

  • History

    Role Reconnaissance and attack compound helicopter

    National origin United States

    Manufacturer Sikorsky Aircraft

    First flight 22 May 2015

    Status Under development

    Number built 3

    Program cost US$200 million

    Developed from Sikorsky X2

  • General info

    Crew: 0-2 pilots

    Capacity: 6 troops

    Length: 35 ft (11 m)

    Gross weight: 8,945 lb (4,057 kg)

    Max takeoff weight: 11,000 lb (4,990 kg) [37]

    Powerplant: 1 × General Electric YT706 , 2,600 shp (1,900 kW)

    Main rotor diameter: 1 (2 coaxial)× 34 ft (10 m)

    Propellers: 6-bladed variable-pitch, clutchable pusher propeller, 7 ft (2.1 m) diameter

  • Performance

    Cruise speed: 253 mph; 407 km/h (220 kn) (with external weapons)

    Never exceed speed: 276 mph; 444 km/h (240 kn)

    Range: 354 mi; 308 nmi (570 km)

    Endurance: 2hr40min

    Service ceiling: 10,000 ft (3,000 m) at 95 °F (35 °C)

    Armament

    Guns: .50 cal gun w/500 rounds

    Rockets: 7-shot rocket pod(s)

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to discover Sikorsky S-97 .

The first flight of the S-97 occurred on 22 May 2015. It flew for 1 hour instead of the planned 30 minutes, completing three takeoffs and landings; forward, rearward and sideward. For this initial flight, the Raider was flown with its triplex fly-by-wire flight control system in backup degraded mode so as to focus on basic airworthiness in the low-speed regime. This begins a year-long flight test program of about 100 flight-hours to expand the flight envelope to meet Sikorsky’s key targets of 220-knot cruise speed carrying weapons, hover at 6,000 feet on a 95F day and 3g maneuverability at speed. Toward the end of Phase 1 testing, software will be upgraded to Block 2, bringing in the propulsor and articulating tail to increase speed and enable the full flight envelope

Sikorsky S-97 Raider

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The Sikorsky S-97 Raider is a high-speed scout and attack compound helicopter based on the Advancing Blade Concept (ABC)

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