P1-1a: Aerodynamics (1-1.11) Flashcards
1.0 aerodynamic terms 1.6 access of rotation in the four forces acting in flight 1.10 stability to 1.11 (34 cards)
What happens to the angle of attack in which an airfoil stalls in regards to weight?
Remain the same
Define Angle of attack.
The angle between the Cordline in the airfoil and the relative wind.
What is the effect of advancing the Throttle in flight?
The airspeed will remain relatively constant but the aircraft will climb.
What is Bernoulli’s principle?
Air travels faster over the curved upper surface of an airfoil causes lower pressure on the top of the surface.
What are the four forces acting on an airplane in flight?
Lift, weight, thrust, drag.
What is the best speed to use for a glide?
One that will result in the greatest glide distance for a given amount of altitude.
What does climb performance depend upon?
A. reserve power or thrust.
What force makes an airplane turn?
The horizontal component of lift.
What happens during an approach to stall with an increased load factor?
The airplane will stall at a higher speed.
What is Positive Static Stability?
The initial tendency of an aircraft to return or not return to its original position.
What happens to the indicated airspeed at which a given airplane stalls as altitude increases?
Remain the same regardless of altitude.
What is Parasite drag?
The resistance of air produced by any part of the plane that does not produce lift.
Examples include antenna, landing gear, etc.
What is induced drag on a plane?
The rearward retarding force caused by the wings creating lift.
What are characteristics of having forward CG?
higher stall speed
lower cruise speed (wing at higher angle),
More stable
Good stall recover characteristics
Increased longitudinal stability,
more induced drag (upward angle),
What is Positive dynamic stability?
The tendency of an aircraft to return or not return to its original position relative to time.
What are characteristics of having aft CG?
higher cruise speed,
lower stall speed,
poor stall/spin recovery.
Decreased longitudinal stability,
What causes an airplane (except a T - tail) to pitch nose down when power is reduced and controls are not adjusted ?
A- The CG shifts forward when thrust and drag are reduced.
B - The downwash on the elevators from the propeller slipstream is reduced and elevator effectiveness is reduced.
C - When thrust is reduced to less than weight , lift is also reduced and the wings can no longer support the weight
B - The downwash on the elevators from the propeller slipstream is reduced and elevator effectiveness is reduced.
Will a plane with a forward CG have higher or lower stall speed?
Higher.
What determines the longitudinal stability of an airplane ?
A - The location of the CG with respect to the center of lift.
B - The effectiveness of the horizontal stabilizer , rudder , and rudder trim tab.
C - The relationship of thrust and lift to weight and drag.
A - The location of the CG with respect to the center of lift.
Changes in the center of pressure of a wing affect the aircraft’s
A - lift / drag ratio
B - lifting capacity.
C - aerodynamic balance and controllability.
C - aerodynamic balance and controllability.
AAH
Advanced Avionics Handbook
AC
Advisory Circular
ACS (cert)
Airman Certificate standard
ACL (chart)
Aeronoautical Chart Legend
