Lift and Drag Flashcards
Lift is defined as what?
Component of aerodynamic force that acts perpendicular to the relative wind
In straight and level flight (constant lift), angle of attack and velocity have ____ relationship.
An inverse
Which airfoil produces no lift at zero degrees angle of attack?
Symmetric airfoil
What is the benefit of geometric and aerodynamic twist on a wing?
The wing root stalls before the wing tip
Parasite drag is defined as what?
Drag caused by anything other than the creation of lift
Painting or cleaning the surface of a wing or aircraft will do what?
Reduce friction drag
Induced drag is caused by what?
The production of lift
In level flight, an increase in velocity will do what?
Decreased induced drag
Total drag is a combination of what?
Induced drag and parasite drag
In relation to velocity, total drag does what?
Decreases until L/DMAX, then increases
Ground effect is a phenomenon that reduces ____ due to a decrease in ____.
Induced drag, downwash
Thrust is the force that opposes what?
Drag
Thrust available ____ as velocity increases for a propeller-driven aircraft
Decreases
As velocity increases, a propeller’s PA will initially increase then ____
Decrease
To roll the airplane to the right, what must happen
The right aileron rises decreasing lift, and the left aileron lowers, increasing lift
For the nose of the airplane to pitch up, what happens?
Trailing edge of the elevator must move up in relation to the horizontal stabilizer
Increasing the camber of a wing does what?
Increases lift
The T-6A has what kind of trailing edge flaps?
Split
Lowering the landing gear handle causes an increase in what?
Parasite drag
Aerodynamic force is what?
Result of pressure and friction distribution over an airfoil
What is the component of aerodynamic force that acts parallel to the relative wind?
Drag
What kind of airfoil produces lift at zero degrees angle of attack?
Positively cambered
L/DMAX is the point where ____
The ratio of lift to drag is the greatest
Total drag is composed of what?
Induced and parasite drag
Parasite drag is what?
Made up of form, friction, and interference drag
Maximum excess power for a propeller-driven aircraft occurs ____ L/DMAX
At
As altitude increases, power available does what?
Decreases
Lowering the flaps to ____ during an approach ____ drag but ____ visibility
Landing (full), increases, improves
