PHAK Chapter 5 Aerodynamics of Flight Flashcards

Forward force produced by the powerplant/propeller or rotor.

Rearward, retarding force caused by disruption of airflow by the wing, rotor, fuselage, and other protruding objects.

<p>Parallel to the longitudinal axis.</p> Signup and view all the answers

<p>Rearward parallel to the relative wind.</p> Signup and view all the answers

<p>A force that is produced by the dynamic effect of the air acting on the airfoil.</p> Signup and view all the answers

<p>Perpendicular to the flight path through the center of lift (CL) and perpendicular to the lateral axis.</p> Signup and view all the answers

<p>The combined load of the aircraft itself, crew, fuel, and cargo.</p> Signup and view all the answers

<p>Vertically downward through the aircraft's center of gravity.</p> Signup and view all the answers

<p>Defined as the acute angle between the chord line of the airfoil and the direction of the relative wind.</p> Signup and view all the answers

<p>Pressure, temperature, and humidity.</p> Signup and view all the answers

<p>The amount of lift generated by a wing or airfoil compared to its drag.</p> Signup and view all the answers

<p>Total drag is at a minimum.</p> Signup and view all the answers

<p>Parasite and induced.</p> Signup and view all the answers

<p>All the forces that work to slow an aircraft's movement.</p> Signup and view all the answers

<p>Form, interference, and skin friction.</p> Signup and view all the answers

<p>The portion of parasite drag generated by the aircraft due to its shape and airflow around it.</p> Signup and view all the answers

<p>Arises from the intersection of airstreams that creates eddy currents, turbulence, or restricts smooth airflow.</p> Signup and view all the answers

<p>The aerodynamic resistance due to the contact of moving air with the surface of an aircraft.</p> Signup and view all the answers

<p>When air and vortices roll off the back of your wing, they angle down.</p> Signup and view all the answers

<p>When the generating aircraft is 'heavy, clean, and slow.'</p> Signup and view all the answers

<p>Mathematical measure of an aircraft's tendency to rotate about its center of gravity (CG).</p> Signup and view all the answers

<p>The reaction of any body when its equilibrium is disturbed.</p> Signup and view all the answers

<p>Static and dynamic.</p> Signup and view all the answers

<p>The initial tendency, or direction of movement, back to equilibrium.</p> Signup and view all the answers

<p>The initial tendency of the aircraft to return to the original state of equilibrium after being disturbed.</p> Signup and view all the answers

<p>The initial tendency of the aircraft to remain in a new condition after its equilibrium has been disturbed.</p> Signup and view all the answers

<p>The initial tendency of the aircraft to continue away from the original state of equilibrium after being disturbed.</p> Signup and view all the answers

<p>Refers to the aircraft response over time when disturbed from a given pitch, yaw, or bank.</p> Signup and view all the answers

<p>Maneuverability and controllability.</p> Signup and view all the answers

<p>Lateral axis, pitching as the aircraft's nose moves up and down in flight.</p> Signup and view all the answers

<p>Stability about the aircraft's longitudinal axis, nose of aircraft to tail.</p> Signup and view all the answers

<p>Dihedral, sweepback, keel effect, and weight distribution.</p> Signup and view all the answers

<p>Outer tips of wings are higher than the wing roots, forming an upward angle.</p> Signup and view all the answers

<p>A high wing aircraft always has the tendency to turn the longitudinal axis of the aircraft into the relative wind.</p> Signup and view all the answers

<p>Stability about the aircraft's vertical axis (the sideways moment).</p> Signup and view all the answers

<p>A coupled lateral/directional oscillation that is usually dynamically stable but is unsafe in an aircraft due to its oscillatory nature.</p> Signup and view all the answers

<p>Aspect ratio, taper ratio, and sweepback.</p> Signup and view all the answers

<p>Ratio of wing span to wing chord.</p> Signup and view all the answers

<p>Planform or thickness or both, is a decrease from wing root to wingtip in wing chord or wing thickness.</p> Signup and view all the answers

<p>Rearward slant of a wing, horizontal tail, or other airfoil surface.</p> Signup and view all the answers

<p>Law of Inertia, states that an object at rest or moving in a straight line remains at rest or continues to move in a straight line until acted on by some other force.</p> Signup and view all the answers

<p>Vertical component of lift must be equal to the weight.</p> Signup and view all the answers

<ol> <li>Torque reaction from engine and propeller, 2. Corkscrewing effect of the slipstream, 3. Gyroscopic action of the propeller, 4. Asymmetric loading of the propeller (P-factor).</li> </ol> Signup and view all the answers

<p>The resultant action, or deflection, of a spinning rotor when a deflecting force is applied to its rim.</p> Signup and view all the answers

<p>Any yawing around the vertical axis.</p> Signup and view all the answers

<p>Any pitching around the lateral axis.</p> Signup and view all the answers

<p>Asymmetric loading; 'bite' of the downward moving blade is greater than the 'bite' of the upward moving blade.</p> Signup and view all the answers

<ol> <li>It is possible for a pilot to impose a dangerous overload on aircraft structures. 2. Increased load factor increases stalling speed and makes stalls possible at seemingly safe flight speeds.</li> </ol> Signup and view all the answers

<p>Factor of safety.</p> Signup and view all the answers

<p>Centrifugal force and weight.</p> Signup and view all the answers

<p>Speed below which you can move a single flight control, one time, to its full deflection, for one axis of airplane rotation only (pitch, roll or yaw), in smooth air, without risk of damage to the airplane.</p> Signup and view all the answers

<p>Stalls at a higher speed, higher elevator control forces, increases the need for greater back elevator pressure.</p> Signup and view all the answers

<p>Cruises faster, less stable, decrease in Angle of Attack (AOA).</p> Signup and view all the answers

<p>Laminar and turbulent.</p> Signup and view all the answers

<p>The boundary between the undisturbed air and the region of compressed air.</p> Signup and view all the answers

<p>The Mach number that produces a sharp change in coefficient of drag.</p> Signup and view all the answers