ENAC

The French Civil Aviation University
081 Principles of Flight
Aerodynamic Forces
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The French Civil Aviation University
Content:
1) Forces acting on an airplane
2) Lift
3) Drag

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The French Civil Aviation University
How does an
airplane fly ?

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The French Civil Aviation University
1- Forces acting on an airplane

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The French Civil Aviation University
In straight and level flight at constant speed with no turning
moments the aircraft is said to be in equilibrium, it means:
THRUST = DRAG
WEIGHT = LIFT