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A semi-rigid rotorhead does not have individual flapping or drag hinges but provides for flapping and lag motion through gimbal mounting. [3] A common example of a semi-rigid rotor is a teetering rotorhead found on the Robinson family of helicopters.
Aircraft recognition generally depends on learning the external appearance of the aircraft, both friendly and hostile, most likely to be encountered. Techniques used to teach this information have included scale models, printed silhouette charts, slide projectors, computer aided instruction and even specially-printed playing cards.
They obtained a patent for the device (French Patent No. 398,545, June 7, 1909). [1] Although its principle is also found in earlier patents by other screw inventors. The first successful implementation of the swashplate was made by de la Cierva in 1922 in his autogyro. [2] In 1907 before the flight test of Cornu's helicopter.
The attack helicopters have only to rise from cover briefly to fire their missiles before returning to a concealed location. [7] Late-development of attack helicopters, such as the Mil Mi-28N, the Kamov Ka-52, and the AH-64D Longbow, incorporate sensors and command and control systems to relieve the requirement for scout helicopters.
It is a common emergency procedure taught to helicopter pilots as part of their training. In normal powered helicopter flight, air is drawn into the main rotor system from above and forced downward, but during autorotation, air moves into the rotor system from below as the helicopter descends.
An OH-6A and two AH-1G Cobra helicopters flying a reconnaissance mission near Phuoc Vinh, c. 1970. It became common for OH-6s to operate in teams with other rotorcraft, particularly the Bell AH-1 Cobra attack helicopter. This teamwork was actively encouraged by Army officials, and led to the development of so-called "hunter-killer" tactics that ...
The KWL chart or table was developed within this methodology and is a form of instructional reading strategy that is used to guide students taking them through the idea and the text. [1] A KWL table is typically divided into three columns titled Know, Want and Learned. The table comes in various forms as some have modified it to include or ...
rotor speed (helicopters) Np and Nr are typically shown on the same gauge with two needles, both expressed in percent, so that the pilot can tell if the power turbine is driving the rotor or if it is freewheeling.
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