# Shared Flashcard Set

## Details

Unit 2.1 Aerodynamics
Vocabulary over the Aerodynamics of an Airplane
41
Aerospace Engineering
09/15/2010

Term
 Aerodynamics
Definition
 The branch of physical science concerned with the reactions caused by the relative motion between a solid body and the surrounding air.
Term
 Astronautics
Definition
 The art and science of designing, building, and operating manned or unmanned space objects.
Term
 Aileron
Definition
 A control surface on fixed-wing aircraft, usually mounted on the aft edge of wings, that controls roll, and is controlled by the wheel; Symbols: delta sub A; Typical units: rad, deg;
Term
 Airfoil
Definition
 Section of a wing, rudder, aileron, or rotorblade used for testing reactions from the air through which it moves.
Term
 Angle of Attack
Definition
 The difference between pitch and the air-referenced flight path angle; the angle between the aircraft center line and the airspeed vector in the vertical plane, positive when the nose is up; Symbols: alpha; Typical units: rad, deg;
Term
 Bernoulli's Equation
Definition
 In fluid dynamics, Bernoulli's principle states that for an inviscid flow, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.
Term
 Boundary Layer
Definition
 The layer of air immediately adjacent to the surface of an airfoil. Its flow, rather than being laminar, is essentially random, or circulatory, and produces a great deal of aerodynamic drag.
Term
 Camber
Definition
 It is the asymmetry between the top and the bottom curves of an airfoil in cross-section
Term
 Center of Gravity
Definition
 The point within something at which gravity can be considered to act; in uniform gravity it is equal to the center of mass
Term
 Center of Pressure
Definition
 The point on a body where the total sum of the aerodynamic pressure field acts, causing a force and no momentum about that point.
Term
 Chord
Definition
 The imaginary straight line joining the trailing edge and the center of curvature of the leading edge of the cross-section of an airfoil
Term
 Chord Line
Definition
 The straight line drawn from a point on the top to a point on the base
Term
 Climb
Definition
 Ascent, an upward slope or grade
Term
 Cruising Flight
Definition
 To travel at a constant speed or at a speed providing maximum operating efficiency for a sustained period
Term
 Drag
Definition
 Force of air against aircraft acting in opposite direction of the airspeed vector projected into horizontal plane
Term
 Drag Coefficient
Definition
 The ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body
Term
 Elevator
Definition
 A control surface on fixed-wing aircraft, usually mounted on the aft edge of stabilizers, that controls pitch, and is controlled by the yoke
Term
 Energy
Definition
 Any source of usable power
Term
 Glide Angle
Definition
 The proper path for an airplane approaching a landing strip
Term
 Glide ratio
Definition
 The ratio of the forward distance traveled to the vertical distance an aircraft descends when gliding without any power
Term
Definition
 Forward edge of an airfoil
Term
 Lift
Definition
 Force, created primarily by wings (fixed wing) or by rotors (rotary wing), acting in opposite direction of gravity fector
Term
 Lift Coefficient
Definition
 A dimensionless coefficient that relates the lift generated by an airfoil
Term
 Lift to Drag Ratio
Definition
 The amount of lift generated by a wing or vehicle, divided by the drag it creates by moving through the air
Term
 Mach Number
Definition
 Ratio of airspeed to the local speed of sound (Mach 1 is the speed of sound under current atmospheric condition)
Term
 Mass
Definition
 The property of a body that causes it to have weight in a gravitational field
Term
 Mean Camber Line
Definition
 A plot of points that lie halfway between the upper and lower surfaces of the wing or airfoil cross section
Term
 Momentum
Definition
 The product of a body's mass and its velocity
Term
 Pitch
Definition
 The angle of a rotor measured in the plane of rotation
Term
 Pitot Static Tube
Definition
 Measuring instrument consisting of a combined Pitot tube and static tube that measures total and static pressure; used in aircraft to measure airspeed
Term
 Roll
Definition
 Bank Angle
Term
 Rudder
Definition
 A control surface on fixed-wing aircraft, usually mounted at aft ending of the fuselage sticking up (like a dorsal fin), that controls yaw (heading), and is controlled by the pedals;
Term
 Slug
Definition
 A unit of mass associated with Imperial units. It is a mass that accelerates by 1ft/second squared when a force of one pound-force (lbf) is exerted on it. Therefore a slug has a mass of 32.17405 pound-mass or 14.5939 kg.
Term
Definition
 Going down at a constant rate
Term
 Streamline
Definition
 To shape an object so that it creates less drag and moves smoothly and easily through the air. Airfoils are streamlined, as is the fuselage
Term
 Thrust
Definition
 A force created by the engines that pushes an aircraft through the air
Term
 Weight
Definition
 The force of gravity acting on an object. The weight force pulls an aircraft toward the Earth and must be overcome by a combination of lift and thrust.
Term
 Wing Area
Definition
 In general, a greater wing area means better low-speed maneuverability and lower takeoff and landing speeds.
Term
 Wing Stall
Definition
 The point at which a plane loses airspeed and stalls
Term
 Wing Tip
Definition
 The part of the wing that is most distant from the fuselage of a fixed-wing aircraft
Term
 Yaw
Definition
 A rotational motion in which the aircraft turns around its vertical axis. This causes the aircraft's nose to move to the pilot's right or left. Pushing the right rudder pedal will tilt the rudder to the right. The pilot will see the nose of the aircraft turn to the right.
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