AE102 - Lift and Drag Flashcards
An aircraft in straight and level flight at a constant velocity is said to be in _________.
Equilibrium
What are the four primary forces acting on an aircraft in flight?
Weight
Lift
Thrust
Drag
Accelerated flight will cause either changes in _______ or _______ or both.
Airspeed or Direction or both.
What is the Lift (or Drag) Formula?
L/D= 1/2 x p x V^2 x S x C(l/d)
L/D: Lift or Drag p: Air density V: Velocity S: Surface Area C(l/d): Coefficient of lift or drag C(l/d) accounts for angle of attack, shape of the airfoil, aspect ratio, viscosity, and compressibility
CL MAX is also called the ________________
Critical Angle of Attack
_______ _______ is a decrease in camber from the wing root to the wing tip.
Aerodynamic Twist
_______ _______ is a decrease in the angle of incidence from the wing root to tip.
Geometric Twist
Parasite drag is drag that is not associated with the production of lift and is composed of what 3 types?
Form drag
Friction drag
Interference drag
_____ drag is the result of separation of airflow from a surface and the wake that is created by that separation.
Form Drag
_____ drag is caused by turbulent airflow in the boundary layer and can be reduced by smoothing the exposed surfaces of the airplane.
Friction Drag
_______ drag is generated by mixing airstreams between aircraft components such as the wing and fuselage.
Interference Drag
_______ _______ is that component of drag that is associated with the production of lift.
Induced Drag
The point at which the ratio of lift to drag is the greatest is known as _______
L/D max
Ground effect increases effective lift when the airplane is within ___ wingspan of the ground.
one
Ground effect reduces induced drag due to a decrease in ________.
downwash
Propeller output is called ____________
Engine output is called __________
thrust horsepower
shaft horsepower
_______ _______ is the amount of thrust that is produced by an engine at a given PCL setting, velocity, and density.
Thrust Available (Ta)
At max power, equilibrium flight will be maintained when thrust available equals thrust required. The T-6A maximum velocity in level flight is limited to approximately ____ KIAS at sea level.
255 KIAS
_______ _______ is the amount of power that an engine is producing at a given PCL setting, velocity, and desnity.
Power available
Thrust available ________ as velocity increases for a propeller-driven aircraft
decreases
How to flaps increase lift on the wing?
By increasing the camber of the wing which increases the coefficient of lift
The plane gains more lift than increased drag up to approximately the ____% flap setting.
50%
Aerodynamic force is the ______________
result of pressure and friction distribution over an airfoil
Maximum excess power for a propeller-driven aircraft occurs (at/above/below) L/Dmax.
at
Maximum excess thrust occurs at a velocity (at/above/below) L/Dmax
below (less than) L/Dmax
