Helicopter Sikorsky S-97 Raider. Photo. Characteristics.
Bell OH-58 Kiowa light multi-purpose helicopter is in service with the US Army 1969 years as a reconnaissance and direct fire support helicopter.
Despite numerous upgrades, everything has long been clear that the OH-58 exhausted itself as a design. Features AH-64 to upgrade is also on the wane. The helicopters of the US Army came two spaces, two niches. The successful design S-97, coincidence, and simple luck, will allow the new helicopter immediately fill two empty niches. What kind of miracle is it? With coaxial rotors and a pusher propeller?
In 2008 year to work out technical improvements to flight test new products was built experimental Sikorsky X2. During flight tests the designer faced a number of serious problems. Confronted with an acute problem with an increase in speed of flight. The fact that the rotation of the propeller, retreat, moving at the speed of flight of the blade is close to the speed of the airflow. Thus, it is idle, i.e. does not create lift.
The engineers of the company Sikorsky, in the early 1970's found a way out of this situation. Two coaxial rotors have two independent swash. Automatic loss of lift is controlled by changing the angle of attack of the retreating blades. All lift blades produced faster. On the model X 2 was first applied not push turbojet engine (or a couple), and a push propeller. This gave a sharp increase in speed (in the middle of 70 years on the S-69 was set unofficial world helicopter speed record equal 487 km \ h). In October 2008 years returned to the concept, and flight tests of X 2 continued. It has been solved and the second serious problem helicopter blades. With increasing speed of rotation of the rotor blades approaching movement endings in the speed of sound. Abruptly increases air resistance. The problem was solved thanks to a pusher propeller.
At some point, the rotation speed of the main rotor slows. Lift is quite enough, ending the blades do not come out in critical conditions, and the forward speed depends entirely on the pusher propeller. So the speed of the new helicopter S-97 Raider came over the line 400 km \ h. While the engine and the aerodynamics of the car accelerates to a speed above 500 km \ h! Six-bladed pusher propeller has the ability to change the pitch, allowing you to optimize and control the flight of the helicopter. Common problems helicopters - vibration, decided with the help of an active vibration control system. The system consists of measuring sensors and vibration frequency generators, extinguishing strictly opposing vibration of a certain frequency in the different points of the fuselage. This allows you to make the flight comfortable for the crew and troops. The power unit in the new helicopter is one and borrowed from the UH-60M Black Hawk. Engine General Electric YT706, gear units and drive the transmission and main rotor and pusher propeller. Rader soon get its own engine, and its cruise speed will be even greater.
The crew consists of two pilots, cargo compartment landing configuration accommodates 6 fully equipped infantrymen. The compartment can be transformed for a specific task. That is, it is universal. Transport, health, attack - not a complete list of modifications compartment. The helicopter has a fully electric remote control system. Mechanical connection to manage at all. It significantly reduced the weight of the helicopter, and reduce its size. Compact yet another helicopter of its competitive advantage. Length 11 m rotor diameter 10m to reduce the size of the site by landing on 15%, that for rescue and military operations is crucial. S-97 has a standard "kit" consisting of various combinations of machine guns 7, 62 and 12, 5 mm, the system 7 rockets Mk 4 FFAR (2, 75-inch), or the installation of AGM-114 Hellfire.
In 2015 it planned to leave only the Apaches in the army, removing them from the national reserve and National Guard. So S-97 goes directly to two goals. Completely replaces the OH-58 and partly AH-64.
Helicopter project Sykorsky S-97 is also unique in that it is entirely built on private investment, a fully private company, without government funding.
S-97 entirely appropriate for the replacement helicopter fleet US FVL Future Vertical Lift, unlike its competitors Bell V-280 Valor and SB-1 Defiant (joint Sikorsky and Boeing), whose first flight is scheduled only 2017 year. Both helicopters are to replace Apache, and in niche multi-Raider has no equal, not even a competition was announced.
So: S-97 Raider-speed, multi-function, the helicopter of the new generation, meanwhile, has no competitors in the world. Terrible and dangerous machine. Who will answer the call?
Sikorsky company introduced the first of the two prototypes of the helicopter Sikorsky S-97 Raider, designed for reconnaissance and combat operations, the exhibition held in October 2 2014, in West Palm Beach, Florida.
The program to create a combat helicopter, being developed by Sikorsky specifically for the US Army.
Sikorsky S 97 Raider photo
Development Programme and the development of a new type of helicopter
The program is developing a model of a new type of helicopter, it was launched in March 2010 years. There was a need to replace the standing armed helicopter Bell OH-58D Riowa Warrior, to a new and improved model. Sikorsky company decided to develop a new helicopter with the launch of the first model in October 2014 years. Prototypes prototypes began to gather in October 2012 2, in the amount of units. When you create a helicopter used the most advanced technology, including the creation of a fuselage made of composite materials.
Sikorsky S 97 Raider poster
Sikorsky Company, together with the Boeing Company has developed a new design of high-rigid coaxial rotor model SB> 1 (JMR TD).
In the case of adoption of a new model helicopter to the US Army, will be replaced model helicopters UH-60 Black Hawk and AH-64 Apache with total funding of 100 billion. Dollars.
Sikorsky S 97 Raider photo
The first prototype should be ready at the end of the year 2014, and is used for intensive test flights, after the second copy in the water in the system, is intended to participate in the demonstration flights. The creation of the helicopter company Sikorsky has invested 150 million. Dollars, plus 200 million. Dollars invested in the form of the suppliers of parts and components of the helicopter. The estimated selling price of the helicopter will be 15 million. Dollars.
Sikorsky S 97 Raider photo
The US Defense Department has not yet made a final decision on the re-transition to new models of helicopters. In parallel with the military version of the helicopter developed a civilian version, which is expected to produce for delivery personnel on oil platforms.
The design features of the new helicopter
The new model of Sikorsky S-97 Raider has the characteristics of the power unit with variable speed coaxial rotors and variable pitch rotation. It is planned to produce controlled model helicopter or 1 2 pilots, as well as with automatic piloting.
Possibilities of use and specifications of the helicopter:
The helicopter crew consists of 1-2 pilots or controlled automatic piloting.
The passenger cabin is designed to carry passengers 6.
Dimensions helicopter length 11 m.
Maximum take-off weight - 4990 kg.
The power plant will consist of 1 engine General Electric YT706, 1900 kW capacity.
Main rotor diameter -10 m.
Rotors - 6 blade variable-pitch pusher propeller and clutchable 2.1 m in diameter.
Cruising speed - 407 km / h
Flight range - 570 km
The residence time in flight - 2 40 hours minutes
The maximum ceiling - 3048 m.
Sikorsky S 97 Raider photo
- 1 50-caliber machine gun and rockets 7.
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