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The FAA states "The height–velocity diagram or H/V curve is a graph charting the safe/unsafe flight profiles relevant to a specific helicopter. As operation outside the safe area of the chart can be fatal in the event of a power or transmission failure it is sometimes referred to as the dead man's curve."
The X-49A made its first flight on June 29, 2007 [9] for 15 minutes at Boeing's New Castle County flight test center. [10] This flight included hovering, pedal turns, and slow forward and sideways flight using the VTDP for anti-torque, directional and trim control. The X-49A project has been silent since completing its initial testing phase in ...
The HAL Dhruv is a utility helicopter designed and developed by Hindustan Aeronautics Limited (HAL) in November 1984. The helicopter first flew in 1992; its development was prolonged due to multiple factors including the Indian Army's requirement for design changes, budget restrictions, and sanctions placed on India following the 1998 Pokhran-II nuclear tests.
The Rudra was developed in parallel to the HAL Light Combat Helicopter (LCH), a more extensive attack helicopter developed from the Dhruv. Extensive changes from the Dhruv were avoided to produce the Rudra with the express purpose of providing an indigenous armed helicopter faster than the LCH programme could do so.
The Fl 282 Kolibri was an improved version of the Flettner Fl 265 announced in July 1940, which pioneered the same intermeshing rotor configuration that the Kolibri used. It had a 7.7 litre displacement, seven-cylinder Siemens-Halske Sh 14 radial engine of 110–120 kW (150–160 hp) mounted in the center of the fuselage, with a transmission mounted on the front of the engine from which a ...
The HAL Light Combat Helicopter (LCH) is a multirole combat helicopter, designed to perform various attack profiles, including relatively high altitude flight. [58] The design and development of the LCH was done in-house, by the Rotary Wing Research and Design Centre (RWR&DC), an internal design office of HAL dedicated to the design of helicopters.
The Sioux is a single-engine single-rotor three-seat observation and basic training helicopter. In 1953 the Bell 47G design was introduced. It can be recognized by the full "soap bubble" canopy (as its designer Arthur M. Young termed it), [7] exposed welded-tube tail boom, saddle fuel tanks and skid landing gear.
The Bell Aircraft Corporation was an American aircraft manufacturer, a builder of several types of fighter aircraft for World War II but most famous for the Bell X-1, the first supersonic aircraft, and for the development and production of many important civilian and military helicopters.