Aerodynamics Flashcards
The four forces acting on an airplane in flight are
lift, weight, thrust, drag
When are the four forces that act on an airplane in equilibrium?
During unaccelerated flight.
What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level flight?
Lift=weight and Thrust=drag
Which statement relates to Bernoulli’s principle?
Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top surface.
Angle between chord line of the wing and relative wind is
angle of attack
As altitude increases, the indicated airspeed at which a given airplane stalls in a particular configuration will
remain the same regardless of altitude.
The angle of attack at which an airplane wing stalls will
remain the same regardless of gross weight.
In what flight condition must an aircraft be placed in order to spin?
Stalled.
During a spin to the left, which wing(s) is/are stalled?
Both wings are stalled.
How will frost on the wings of an airplane affect takeoff performance?
Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability.
Why is frost considered hazardous to flight?
Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability.
How does frost affect the lifting surfaces of an airplane on takeoff?
Frost may prevent the airplane from becoming airborne at normal takeoff speed.
One of the main functions of flaps during approach and landing is to
increase the angle of descent without increasing the airspeed.
What is one purpose of wing flaps?
To enable the pilot to make steeper approaches to a landing without increasing the airspeed.
An airplane said to be inherently stable will
require less effort to control.
What determines the longitudinal stability of an airplane?
The location of the center of gravity with respect to the center of lift.
Loading an airplane to the most aft center of gravity will cause the airplane to be
less stable at all speeds.
What causes an airplane (except a T-tail) to pitch nosedown when power is reduced and controls are not adjusted?
The downwash on the elevators from the propeller slipstream is reduced and elevator effectiveness is reduced.
An airplane has been loaded in such a manner that the center of gravity is located aft of the aft CG limit. One undesirable flight characteristic a pilot might experience with this airplane would be
difficulty in recovering from a stalled condition.
Changes in the center of pressure of a wing affect the aircraft’s
aerodynamic balance and controllability.
What force makes an airplane turn?
The horizontal component of lift.
The amount of excess load that can be imposed on the wing of an airplane depends upon the
speed of the airplane.
Which basic flight maneuver increases the load factor on an airplane as compared to straight-and-level flight?
Turns.
During an approach to a stall, an increased load factor will cause the airplane to
stall at a higher airspeed.
How to figure load factor.
How to figure total load.
Bank angle compared to G’s Chart
Weight x load factor = total load
In what flight condition is torque effect the greatest in a single-engine airplane?
Low airspeed, high power, high angle of attack.
