Glide Polar Graphs and Flight Manual Quiz
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Questions and Answers

Which axis does yaw movement represent?

  • Vertical axis (correct)
  • Longitudinal axis
  • Lateral axis
  • None of the above

    • What controls the pitch of the glider?

  • Rudder
  • Ailerons
  • Stick (correct)
  • None of the above

    • What does positive dynamic and static stability mean?

  • The glider oscillates with time
  • The glider reduces its oscillations with time (correct)
  • The glider's oscillations increase in amplitude with time
  • None of the above

    • Which forces act upon an aircraft during straight-and-level flight?

    <p>Lift, gravity, thrust, and drag</p> Signup and view all the answers

    What happens to the potential energy of a glider as it glides downward?

    <p>It is converted into kinetic energy</p> Signup and view all the answers

    What is the force of gravity measured in?

    <p>Pounds or kilograms</p> Signup and view all the answers

    Which type of wing planform minimizes induced drag?

    <p>Elliptical</p> Signup and view all the answers

    What is the purpose of a turbulator on a glider wing?

    <p>To delay separation of the boundary layer</p> Signup and view all the answers

    What causes interference drag on a glider?

    <p>Interaction of varied air currents</p> Signup and view all the answers

    What is induced drag?

    <p>Drag caused by wing lift</p> Signup and view all the answers

    Which type of drag increases with the square of speed?

    <p>Parasite drag</p> Signup and view all the answers

    What causes form drag?

    <p>The turbulent wake caused by the separation of airflow from the surface of a structure</p> Signup and view all the answers

    What is the main cause of skin friction drag?

    <p>The roughness of the glider's surfaces</p> Signup and view all the answers

    Which type of boundary layer creates more skin friction drag?

    <p>Turbulent boundary layer</p> Signup and view all the answers

    According to Newton's Third Law of Motion, for every action there is an equal and opposite reaction. What is the reaction produced when the air is deflected downward?

    <p>An upward reaction</p> Signup and view all the answers

    What is the objective of a glider pilot?

    <p>To remain in air rising faster than the glider must descend</p> Signup and view all the answers

    What is the mathematical relationship between lift and airspeed?

    <p>Lift is proportional to the square of airspeed</p> Signup and view all the answers

    What is the coefficient of lift?

    <p>The ratio of lift pressure to dynamic pressure and area</p> Signup and view all the answers

    Which of the following is true about the glide polar graph?

    <p>It details the glider's still air sink rate at different airspeeds.</p> Signup and view all the answers

    What can be determined from the glide polar graph?

    <p>The glider's best lift/drag (L/D) speed.</p> Signup and view all the answers

    What is the minimum sink speed?

    <p>The airspeed at which the glider loses altitude at the lowest rate.</p> Signup and view all the answers

    How does adding water ballast affect the glide polar graph?

    <p>It shifts the graph down and to the right.</p> Signup and view all the answers

    Which type of wing design is more efficient in terms of LD, but has the potential to cause loss of control with little warning?

    <p>Elliptical Wing</p> Signup and view all the answers

    Which type of wing design is similar in efficiency to the elliptical wing, but creates more induced drag than the elliptical wing of comparable size?

    <p>Rectangular Wing</p> Signup and view all the answers

    Which type of wing design is used to allow the lifting area of the wing to move forward, while keeping the mounting point aft of the cockpit?

    <p>Swept-Forward Wing</p> Signup and view all the answers

    Which type of wing design produces less drag than the rectangular wing, assuming equal wing area?

    <p>Tapered Wing</p> Signup and view all the answers

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