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Since the lift generated by an aerofoil increases as its relative airspeed increases, on a forward-moving helicopter the blade-tip at position A produces more lift than that at point B. So the rotor disc produces more lift on the right hand side than on the left hand side (for an American-style helicopter). This imbalance is "dissymmetry of lift".
In normal operating circumstances, forward flight results in flapback caused by dissymmetry of lift and the transverse flow effect. [2]: 2–20 Dissymmetry of lift is where the forward-moving rotor blade has a faster airspeed, so it generates more lift, which would cause the rotor disc to tilt to the side. To prevent this the forward-moving ...
A coaxial-rotor aircraft is an aircraft whose rotors are mounted one above the other on concentric shafts, with the same axis of rotation, but turning in opposite directions (contra-rotating). This rotor configuration is a feature of helicopters produced by the Russian Kamov helicopter design bureau .
The K-1200 K-MAX "aerial truck" is the world's first helicopter specifically designed, tested, and certified for repetitive external lift operations and vertical reference flight (Kaman received IFR Certification in 1999), an important feature for external load work. Other rotorcraft used for these tasks are adapted from general-purpose ...
To achieve pitch, opposite collective is applied to each rotor; decreasing the lift produced at one end, while increasing lift at the opposite end, effectively tilting the helicopter forward or back. [3] Tandem-rotor helicopters have the advantage of being able to hold more weight with shorter blades, since there are two sets.
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The Robinson R44 aircraft spun out of control on its approach to the helicopter garage at Pearland Regional Airport around 9:30 Sunday morning, the dizzying CCTV footage of the incident showed.
The Z-18 is a development of the Avicopter AC313 and Changhe/Harbin Z-8, both of which are developments of the Aérospatiale SA 321 Super Frelon. [2] [1]Notable changes include a redesigned lower fuselage similar to the AC313 which results in larger internal space. [3]