Angle of Attack
Angle between chord line and airflow
- Angle of attack determines lift and drag characteristics; excessive angles can lead to stall conditions.
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Flight Envelope
Range of safe operating conditions
- The flight envelope defines limits for speed, altitude, and load factors to ensure safe aircraft operation.
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Stall
Loss of lift due to high angle of attack
- Stall occurs when airflow separates from the wing surface, drastically reducing lift and potentially causing loss of control.
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Load Factor
Ratio of lift to weight
- Load factor indicates stress on the aircraft structure during maneuvers, expressed in multiples of gravity (g).
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Mach Number
Ratio of speed to speed of sound
- Mach number indicates whether an aircraft is subsonic, transonic, supersonic, or hypersonic, affecting aerodynamic behavior.
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Induced Drag
Drag due to lift generation
- Induced drag results from wingtip vortices and pressure differences, increasing with higher lift demands.
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Boundary Layer
Thin layer of air near surface
- The boundary layer is the region of airflow close to the aircraft surface where viscous effects are significant, influencing drag.
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Parasite Drag
Drag from non-lifting surfaces
- Parasite drag includes form, skin friction, and interference drag, increasing with speed.
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Reynolds Number
Dimensionless flow parameter
- Reynolds number characterizes flow regimes (laminar or turbulent) around aircraft surfaces, impacting aerodynamic performance.
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