Mil Mi-X1 Helicopter
"Helicopters of Russia" started to work on a promising medium helicopters. The main idea of this project is to form a system of maximum transport accessibility of the Russian regions. The project received the designation RACHEL (Russian Advanced Commercial Helicopter) and has already been presented at several international aviation exhibitions.
Pusher propellers will be the level-flight propulsion configuration of choice for Russian helicopter manufacturers Mil and Kamov for a new breed of high-speed rotorcraft to fly in the 2015 timeframe. In 2008 both Russian helicopter specialists revealed high-speed helicopter concepts competing for the Rb15 billion ($635 million) government allocation for development of new rotorcraft technologies. Kamov has two concepts - the Ka-90 and Ka-92. Mil is challenging with the Mi-X1 and unpiloted MRVK. A single superior concept is expected to be selected to serve as the base for the creation of production models.
The Mi-X1 and MRVK use similar rotor systems, with a main rotor and rear-mounted pusher propeller that gives a boost in cruise and adds torque stabilisation through thrust vectoring. Like the Ka-92, Mil's design also has two VK2500s for power, but is lighter at 10,000kg normal and 12,000kg maximum take-off weight. The smaller cabin will accommodate 20-25 passengers or 3,500-4,000kg of cargo. Static ceiling will be 11,500ft and range up to 1,550km.
The Mi-X1 is being developed for a cruise speed of 257kt and maximum speed of 280kt using an innovative main rotor design with computer control. Mil is working on a system to suppress local stalls on the retreating blade. Such high speed would be achieved by applying a technology called the Stall Local Elimination System (SLES) in the main rotor. SLES delays the stall on the retreating blade through the control of its orientation angle. According to Mil calculations, the SLES should work well at speeds of up to 400 km/h. To delay the blade stall at higher speeds, Mil suggests a combination of the SLES technology with an arrow-type shape to the blade tip. Contributing to the helicopter's speed is the potential use of a tail-mounted propeller with thrust vector control via surfaces installed in slipstream.
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