Chapter 6. Aerodynamic Forces

(Refer to Figure 2.) If an airplane weighs 3,300 pounds, what approximate weight would the airplane structure be required to support during a 30° banked turn while maintaining altitude? A. 3,960 pounds. B. 3,100 pounds. C. 1,200 pounds.

A. 3,960 pounds.

(Refer to Figure 2.) If an airplane weighs 4,500 pounds, what approximate weight would the airplane structure be required to support during a 45° banked turn while maintaining altitude? A. 6,750 pounds. B. 4,500 pounds. C. 7,200 pounds.

A. 6,750 pounds.

What is the effect of advancing the throttle in flight? A. Both aircraft groundspeed and angle of attack will increase. B. Airspeed will remain relatively constant but the aircraft will climb. C. The aircraft will accelerate, which will cause a turn to the right.

A. Both aircraft groundspeed and angle of attack will increase.

How does frost affect the lifting surfaces of an airplane on takeoff? A. Frost may prevent the airplane from becoming airborne at normal takeoff speed. B. Frost may cause the airplane to become airborne with a lower angle of attack at a lower indicated airspeed. C. Frost will change the camber of the wing, increasing lift during takeoff.

A. Frost may prevent the airplane from becoming airborne at normal takeoff speed.

Why is frost considered hazardous to flight? A. Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability. B. Frost changes the basic aerodynamic shape of the airfoils, thereby increasing lift. C. Frost slows the airflow over the airfoils, thereby increasing control effectiveness.

A. Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability.

The left turning tendency of an airplane caused by P-factor is the result of the

A. clockwise rotation of the engine and the propeller turning the airplane counterclockwise. B. propeller blade descending on the right, producing more thrust than the ascending blade on the left. C. gyroscopic forces applied to the rotating propeller blades acting 90° in advance of the point the force was applied.

(Refer to Figure 72.) A positive load factor of 2 at 80 mph would cause the airplane to A. stall. B. break apart. C. operate normally, as it is within the normal operating range.

A. stall.

(Refer to Figure 2.) If an airplane weighs 2,300 pounds, what approximate weight would the airplane structure be required to support during a 60° banked turn while maintaining altitude? A. 2,300 pounds. B. 4,600 pounds. C. 3,400 pounds.

B. 4,600 pounds.

During a spin to the left, which wing(s) is/are stalled? A. Neither wing is stalled. B. Both wings are stalled. C. Only the left wing is stalled.

B. Both wings are stalled.

How will frost on the wings of an airplane affect takeoff performance? A. Frost will change the camber of the wing, increasing its lifting capability. B. Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability. C. Frost will cause the airplane to become airborne with a higher angle of attack, decreasing the stall speed.

B. Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability.

What force makes an airplane turn? A. Centrifugal force. B. The horizontal component of lift. C. The vertical component of lift.

B. The horizontal component of lift.

Which basic flight maneuver increases the load factor on an airplane as compared to straight-and-level flight? A. Climbs. B. Turns. C. Stalls.

B. Turns.

(Refer to Figure 72.) The airspeed indicated by points A and J is A. maneuvering speed. B. normal stall speed. C. maximum structural cruising speed.

B. normal stall speed.

During an approach to a stall, an increased load factor will cause the aircraft to A. have a tendency to spin. B. stall at a higher airspeed. C. be more difficult to control.

B. stall at a higher airspeed.

(Refer to Figure 72.) What load factor would be created if positive 15 feet per second gusts were encountered at 120 mph? A. 3 B. 2.8 C. 2

C. 2

In what flight condition are torque effects more pronounced in a single-engine airplane? A. High airspeed, high power, high angle of attack. B. Low airspeed, low power, low angle of attack. C. Low airspeed, high power, high angle of attack.

C. Low airspeed, high power, high angle of attack.

In what flight condition must an aircraft be placed in order to spin? A. Partially stalled with one wing low. B. In a steep diving spiral. C. Stalled.

C. Stalled.

Select the four flight fundamentals involved in maneuvering an aircraft. A. Aircraft power, pitch, bank, and trim. B. Starting, taxiing, takeoff, and landing. C. Straight-and-level flight, turns, climbs, and descents.

C. Straight-and-level flight, turns, climbs, and descents.

What determines the longitudinal stability of an airplane? A. The relationship of thrust and lift to weight and drag. B. The effectiveness of the horizontal stabilizer, rudder, and rudder trim tab. C. The location of the CG with respect to the center of lift.

C. The location of the CG with respect to the center of lift.

When does P-factor cause the airplane to yaw to the left? A. When at high airspeeds. B. When at low angles of attack. C. When at high angles of attack.

C. When at high angles of attack.

Changes in the center of pressure of a wing affect the aircraft's A. lifting capacity. B. lift/drag ratio. C. aerodynamic balance and controllability.

C. aerodynamic balance and controllability.

An airplane said to be inherently stable will A. be difficult to stall. B. not spin. C. require less effort to control.

C. require less effort to control.

The amount of excess load that can be imposed on the wing of an airplane depends upon the A. abruptness at which the load is applied. B. position of the CG. C. speed of the airplane.

C. speed of the airplane.