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12 Cards in this Set
- Front
- Back
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What does part of Bernoulli's Principle state? |
"The internal pressure of a fluid (liquid or gas) decreases at points where the speed of the fluid increases." (L9, P3) |
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When does a pressure differential occur and how does it relate to an airfoil? |
When there is a pressure difference between opposing sides of a surface.
It causes the higher pressure area below the airfoil to try to equalize pressure by pushing (lifting) the airfoil toward the lower pressure area above. (L9, P4) |
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What is Newton's Third Law of Motion? |
"For every action, there is an equal and opposite reaction."
Action: Air striking the underside of an airfoil Reaction: The wing being pushed up (L9, P5) |
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A secondary source of lift is a(n) __________ force generated by air striking the underside of an airfoil and being deflected __________.
A. low pressure; downward B. downward; upward C. upward; downward D. high pressure; upward |
C. upward; downward (L9, P5) |
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The primary source of lift on an airfoil is created by a differential in __________.
A. temperature B. pressure C. reaction |
B. pressure (L9, P5) |
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The statement. "the internal pressure of a fluid decreases at points where the speed of the fluid increases" is a part of __________.
A. Bernoulli's Principle B. Newton's Law of Motion C. Hindenberg's Theory |
A. Bernoulli's Principle (L9, P5) |
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The direction of the airflow produced by an object moving through the air is known as __________.
A. Flight path B. Relative Wind C. Newton's Third Law of Motion D. Airfoil |
B. Relative Wind (L9, P6) |
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Relative Wind for an aircraft in flight flows in a direction __________ with and __________ to the direction of flight.
A. perpendicular; opposite B. parallel; in relation C. perpendicular; in relation D. parallel; opposite |
D. parallel; opposite (L9,P6) |
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The direction that an airfoil is pointed determines the direction of the relative wind.
A. True B. False |
B. False; The actual flight path of the aircraft determines the direction of the relative wind. (L9, P6) |
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Name the six types of airfoils on an aircraft. |
1. Wing 2. Propeller 3. Helicopter Rotor 4. Horizontal Stabilizer 5. Vertical tail surfaces 6. Fuselage (L9, P7) |
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Name the three principle airfoils that produce lift on an aircraft. |
1. Wing 2. Horizontal Tail Surfaces 3. Propeller (L9, P7) |
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What is an empennage? |
The tail assembly of an aircraft including the arrangement of stabilizing surfaces (i.e. the rudder, elevators, stabilator, horizontal stabilizer). |
