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Chords on a swept-wing. In aeronautics, the chord is an imaginary straight line segment joining the leading edge and trailing edge of an aerofoil cross section parallel to the direction of the airflow. The chord length is the distance between the trailing edge and the leading edge.
Aeronautical Radio Inc. ARO Airport reservation office ARP Aerodrome reference point ARTCC Air route traffic control centers ASAS Airborne Separation Assurance System ASD Aircraft situation display ASDA Accelerate Stop Distance Available: ASDE-X Airport Surface Detection Equipment, Model X: ASDL Aeronautical satellite data link ASI Airspeed ...
The chord length is the distance between the trailing edge and the point on the leading edge where the chord intersects the leading edge. [ 42 ] [ 43 ] Clean configuration – is the flight configuration of a fixed-wing aircraft when its external equipment is retracted to minimize drag and thus maximize airspeed for a given power setting.
In fluid dynamics, angle of attack (AOA, α, or ) is the angle between a reference line on a body (often the chord line of an airfoil) and the vector representing the relative motion between the body and the fluid through which it is moving. [1] Angle of attack is the angle between the body's reference line and the oncoming flow.
Constant chord: parallel leading & trailing edges. Simplest to make, and common where low cost is important, such as on the Piper J-3 Cub but inefficient as the outer section generates little lift while adding both weight and drag.
For symmetrical airfoils =, so the aerodynamic center is at 25% of chord measured from the leading edge. But for cambered airfoils the aerodynamic center can be slightly less than 25% of the chord from the leading edge, which depends on the slope of the moment coefficient, . These results obtained are calculated using the thin airfoil theory so ...
The aerodynamic center of an airfoil is usually close to 25% of the chord behind the leading edge of the airfoil. When making tests on a model airfoil, such as in a wind-tunnel, if the force sensor is not aligned with the quarter-chord of the airfoil, but offset by a distance x, the pitching moment about the quarter-chord point, / is given by
The chord of the slat is typically only a few percent of the wing chord. The slats may extend over the outer third of the wing, or they may cover the entire leading edge . Many early aerodynamicists, including Ludwig Prandtl , believed that slats work by inducing a high energy stream to the flow of the main airfoil , thus re-energizing its ...