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24 Cards in this Set
- Front
- Back
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Weight |
force with which an object is attracted towards the center of the earth |
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Wing drag |
drag of the wings or lifting surfaces of the aircraft |
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Parasite drag |
drag of parts which do not contribute towards the lift of the aircraft |
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Form drag |
pressure on the forward-facing part is higher than that on the rearward-facing portion. |
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Chord line |
the imaginary straight line joining the leading and trailing edges of an airfoil |
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Stagnation point |
a point in a flow field where the local velocity of the fluid is zero
Stagnation points exist at the surface of objects in the flow field, where the fluid is brought to rest by the object |
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Stalling angle |
angle of attack at which the lift coefficient of an aerofoil is a maximum |
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The three sources of error for wind tunnel experiments on models used to forecast full-scale results: |
1. Scale effect
2. Interference from wind tunnel walls
3. Small, inconspicuous errors in model |
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Aerodynamic factors that affect an aerofoil |
1. Shape
2. Plan area
3. Square of the velocity
4. Density of the air |
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The aerodynamic centre is usually about _____________ of the chord from the leading edge. |
one-quarter |
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If an airscrew is in front of an aeroplane, it is called a _________; if an airscrew is in the back of an aeroplane, is it called a _________. |
tractor; pusher |
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Power |
rate of doing work |
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Flaperon |
combines aspects of both flaps and ailerons. |
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Taileron |
a fully movable aircraft stabilizer. |
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Compound helicopter |
a helicopter with an auxiliary propulsion system which provides forward thrust. |
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Service ceiling |
height at which the rate of climb becomes less than 0.5m/s. |
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Longitudinal dihedral/anhedral angle |
the upward/downward angle with respect to the main plane and tail plane whilst looking at it from the side. |
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Lateral dihedral/anhedral angle |
the upward/downward angle with respect to the wings of the main plane whilst looking at it from the front. |
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Longitudinal control is provided by the ________; roll control is provided by the __________; directional control is provided by the ___________. |
elevators; ailerons; rudder |
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Shock stall |
stall caused by the airflow over an aircraft's wings being disturbed by shock waves when flying at or near to the aircraft's critical Mach number. |
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The speed of sound varies according to the ___________ of the air. |
temperature |
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Critical Mach number |
the lowest Mach number at which the airflow over some point of the aircraft reaches the speed of sound, but does not exceed it |
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Subsonic region: ___M to ___M Transonic region: ___M to ___M Supersonic region: ___M+ |
0.0; 0.8 0.8; 1.2 1.2 |
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Dutch roll |
combination of roll and yaw |
