ASA Private Pilot Test Prep Answered 100% Correct

Airfoil - ANSWER-A structure or body which produces a useful reaction to air movement. Chord Line - ANSWER-An imaginary straight line from the leading edge to the trailing edge of an airfoil. Relative Wind - ANSWER-The wind felt by an airfoil (Parallel and in the opposite direction to the flight path of the airfoil). Angle of Attack - ANSWER-The angle between the chord line of the airfoil and the relative wind. Angle of Incidence - ANSWER-The angle at which a wing is attached to the aircraft fuselage. Lateral Axis - ANSWER-An imaginary line from wing tip to wing tip. Pitch - ANSWER-Rotation around the lateral axis, controlled by the elevators. Longitudinal Control or Longitudinal Stability - ANSWER-Stability due to pitch. Longitudinal Axis - ANSWER-An imaginary line from the nose to the tail. Roll - ANSWER-Rotation around the longitudinal axis, controlled by the ailerons. Lateral Control or Lateral Stability - ANSWER-Stability due to Roll. Vertical Axis - ANSWER-An imaginary line extending vertically through the intersection of the lateral and longitudinal axis. Yaw - ANSWER-Rotation about the vertical axis, controlled by the rudder. Directional Control or Directional Stability - ANSWER-Stability due to yaw. Center of Gravity - ANSWER-The imaginary point where all the weight is concentrated. The three axis meet at this point. Weight - ANSWER-Downward acing force that must be overcome by lift. P Lift - ANSWER-Upward acting force that must overcome weight. Drag - ANSWER-Rearward acting force that must be overcome by thrust. Thrust - ANSWER-Forward acting force that must overcome drag. Bernoulli's Principle - ANSWER-As the velocity of a fluid increases, its pressure decreases. How is lift created? - ANSWER-There is a pressure difference between the top and the bottom of the wing. Air accelerating over the top of the wing creates an area of low pressure. What 2 things can the pilot control in order to increase lift? - ANSWER-Increasing either the angle of attack or airspeed. Parasite Drag - ANSWER-The resistance of the air produced by any part of an airplane that does not produce lift. This kind of drag increases as airspeed increases. Induced Drag - ANSWER-A by-product of lift. High pressure air beneath the wing tries to flow to the area of low pressure, causing a vortex behind the wing tips and along the trailing edge of the wing. As the angle of attack is increased, lift will increase and so will the vortices and downwash. This kind of drag increases as airspeed decreases. Stability - ANSWER-The inherent ability of an airplane to return, or not return, to its original flight condition after being disturbed by an outside force. Positive Static Stability - ANSWER-The initial tendency of an aircraft to return or not return to its original position. Positive Dynamic Stability - ANSWER-The tendency of an oscillating airplane to return to its original position relative to time. Horizontal Lift Component - ANSWER-Horizontal force that forces the airplane from straight and level flight and causes it to turn. Vertical Lift Component - ANSWER-This component is reduced in turns, resulting in a loss of altitude unless total lift is increased by increasing angle of attack, airspeed, or both. Load - ANSWER-The force that must be supported by an airplane structure in flight. Load factor - ANSWER-Loads imposed on the winds in flight What load does an airplane in straight and level flight support? - ANSWER-The sum of the weight of the aircraft plus its contents, equal to 1 "G."