Master the Fundamentals of Aerodynamics
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Questions and Answers

Which unit is commonly used to measure atmospheric pressure at sea level in aviation altimeters and U.S weather reports?

  • Millibars (mb)
  • Pounds per inch
  • Inches of mercury (hg) (correct)
  • Pounds per square inch (psi)

    • What is the standard measurement of barometric pressure in aviation altimeters and U.S weather reports?

  • Millibars (mb)
  • Inches of mercury (hg) (correct)
  • Pounds per square inch (psi)
  • Pounds per inch

    • What is the metric unit used to indicate pressure in worldwide weather maps and some non-U.S manufactured aircraft instruments?

  • Pounds per square inch (psi)
  • Millibars (mb) (correct)
  • Inches of mercury (hg)
  • Pounds per inch

    • What is the average atmospheric pressure at sea level in pounds per square inch (psi)?

    <p>14.7 psi</p> Signup and view all the answers

    What happens to atmospheric pressure as an aircraft descends?

    <p>Atmospheric pressure decreases</p> Signup and view all the answers

    What is the density of air governed by?

    <p>Pressure and volume</p> Signup and view all the answers

    Which line in the airfoil or wing section represents the direction of the relative airstream?

    <p>Chord line</p> Signup and view all the answers

    What is the angle between the chord line of the wing and the direction of the relative wind called?

    <p>Angle of attack</p> Signup and view all the answers

    What is the angle between the chord line of the wing and the longitudinal axis of the aircraft called?

    <p>Angle of incidence</p> Signup and view all the answers

    What is the small force present on each part of an airfoil or wing surface called?

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

    What is the sum of all the small forces acting on an airfoil or wing surface called?

    <p>Resultant force</p> Signup and view all the answers

    How is the resultant force represented?

    <p>As a vector</p> Signup and view all the answers

    Which of the following is the primary focus of the study of aerodynamics?

    <p>The movement of an object and its reaction to the airflow around it</p> Signup and view all the answers

    What is the major difference between air and water?

    <p>Air is compressible and water is incompressible</p> Signup and view all the answers

    Why is it important for an airframe and power plant mechanic to understand aerodynamics?

    <p>To be able to maintain today's complex aircraft</p> Signup and view all the answers

    What does the term 'aerodynamics' mean?

    <p>The study of objects in motion through the air and the forces that produce or change such motion</p> Signup and view all the answers

    What is atmospheric pressure?

    <p>The force exerted against the Earth's surface by the weight of the air above that surface</p> Signup and view all the answers

    What is the weight of a column of air extending from sea level to the top of the atmosphere?

    <p>Approximately 14 pounds per square inch</p> Signup and view all the answers

    Which of the following factors affects the aerodynamic performance of an aircraft?

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

    What is the difference between speed and velocity?

    <p>Speed is the rate of motion, while velocity includes both speed and direction.</p> Signup and view all the answers

    What do Newton's laws of motion govern?

    <p>The action of air around a wing</p> Signup and view all the answers

    According to Bernoulli's principle, what happens to air speed and pressure when it flows through a constriction?

    <p>Air speed increases and pressure decreases</p> Signup and view all the answers

    What is an airfoil?

    <p>A surface that obtains lift from the air</p> Signup and view all the answers

    Which factors affect lift and efficiency of an airfoil?

    <p>Shape and camber</p> Signup and view all the answers

    Which force counteracts the effects of weight?

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

    What is the point of intersection of the resultant force line with a chord line of the airfoil called?

    <p>Center of Pressure</p> Signup and view all the answers

    What happens to the airfoil when the angle of attack exceeds the critical angle?

    <p>It stalls</p> Signup and view all the answers

    What is the layer of airflow closest to the surface of the aircraft called?

    <p>Boundary Layer</p> Signup and view all the answers

    What are the four forces acting on an aircraft in flight?

    <p>Weight, lift, thrust, drag</p> Signup and view all the answers

    What causes a decrease in lift and an increase in drag on an airfoil?

    <p>Critical Angle</p> Signup and view all the answers

    Study Notes

    Aerodynamics of Flying: Key Forces and Concepts

    • The point of intersection of the resultant force line with a chord line of the airfoil is called the center of pressure (CP).
    • The CP moves along the airfoil cord as the angle of attack (AOA) changes.
    • A properly designed airfoil exhibits an increase in lift as the AOA increases, until it reaches the angle of maximum lift, known as the critical angle.
    • At the critical angle, the air begins to flow turbulently over the top surface of the airfoil, causing a decrease in lift and an increase in drag.
    • When the AOA exceeds the critical angle, the airfoil stalls, resulting in a loss of lift and excessive drag.
    • The distribution of pressure forces over the airfoil varies with the AOA.
    • The boundary layer, the layer of airflow closest to the surface of the aircraft, plays a crucial role in minimizing pressure drag and skin friction drag.
    • In flight, an aircraft is acted upon by four forces: weight, lift, thrust, and drag.
    • Weight is the force of gravity acting downward on the aircraft.
    • Lift is the upward force that counteracts the effects of weight.
    • Thrust is the forward force produced by the power plant that overcomes drag.
    • Drag is the backward deterrent force caused by the disruption of airflow by the wings, fuselage, and protruding objects.

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    Description

    Test your knowledge on the key forces and concepts of aerodynamics in flying. Discover how the center of pressure, angle of attack, and airfoil design affect lift and drag. Explore the roles of weight, lift, thrust, and drag in flight.

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