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Each type of helicopter has a specific airspeed at which a power-off glide is most efficient. The best airspeed is the one that combines the greatest glide range with the slowest rate of descent. The specific airspeed is different for each type of helicopter, yet certain factors (density altitude, wind) affect all configurations in the same manner.
In helicopter aerodynamics, the Lock number is the ratio of aerodynamic forces, which act to lift the rotor blades, to inertial forces, which act to maintain the blades in the plane of rotation. [1] It is named after C. N. H. Lock, a British aerodynamicist who studied autogyros in the 1920s. [2] [3]: 267
Dissymmetry of lift in an American-style helicopter. Consider a single-rotor helicopter in still air. For a stationary (hovering) helicopter, whose blades of length of r metres are rotating at ω radians per second, the blade tip is moving at a speed rω meters per second. As the blades rotate, the speed of the blade-tips relative to the air ...
[1] As the airspeed increases without an increase in height, there comes a point where the pilot's reaction time would be insufficient to initiate a flare, and prevent a high-speed ground impact. Each increase in height increases the pilot reaction time. This is the reason the bottom right part of the H/V curve has a shallow gradient. If above ...
Flapback [1]: 3:28 or blowback [2]: 2–14, 2–20, 2–21 [3] is the tilting of a helicopter rotor disc, usually aft (backwards), which occurs in several circumstances. In normal operating circumstances, forward flight results in flapback caused by dissymmetry of lift and the transverse flow effect .
At 180 knots (333 km/h; 207 mph) level flight, it could enter a 1.4 g bank turn with the rotor in autorotation, increasing rotor rpm. [5] Airframe stress prevented rotor speed reduction and thus full flight envelope expansion. [5] The XH-59A had high levels of vibration and fuel consumption. [6] [3] The 106-hour test program for the XH-59A ...
Juan Soto watches his solo home run in Game 2 of the 2024 World Series at Dodger Stadium. He hit .327 this past postseason for the Yankees with four homers, nine RBI and a 1.102 OPS in 14 games.
Law 1. A body continues in its state of rest, or in uniform motion in a straight line, unless acted upon by a force. Law 2. A body acted upon by a force moves in such a manner that the time rate of change of momentum equals the force. Law 3. If two bodies exert forces on each other, these forces are equal in magnitude and opposite in direction.