By Robert C. Stern
London released sleek Conflicts - Air
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Additional resources for America’s Fighters of the 1980s: F-16 and F-18 (Warbirds Illustrated 17)
E. e. e. the position of the center of mass" where the aircraft ceases to be stable but has not yet become unstable). The moment of aerodynamic forces with respect to the aircraft's center of mass is made up of the sum of moments of wing, fuselage and engine nacelles on one side and the tail plane moment on the other. The wing moment is characterized by "the turning action" of the lift force. The larger the lift force and the farther from the aircraft's center of mass it is applied, the larger the wing moment.
Let the air flow around the wing of an aircraft placed at a small positive angle a (Fig. 5) to the direction of flow. The stream of air is decelerated in front of the wing and then is divided into two parts. One part flows over the upper surface of the wing while the other flows under the lower surface. Behind the wing the two flows join up again. Since the wing has a bulging shape the upper stream of air moves a greater distance than the lower one. Due to this the velocity of the upper stream increases and its pressure decreases.
E. on the angle of attack. The magnitude of cu is equal to the lift measured at a given angle of attack divided by the area of the wing and velocity head. Similarly, if the magnitude of the measured drag force is divided by the product of the wing area and velocity head, we get the coefficient of drag c®. The introduction of coefficients wings of various design parameters, c,_ and c v made it possible to compare fuselages, etc. For determination of 30 Soviet Aircraft these and Rockets coefficients devices tests for creating are usually carried out in wind a flow of air of the required tunnels which are velocity.