Aerodynamic Forces QZ1 Flashcards
(PAR-AF-18) (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?
1. 7,200 pounds.
2. 4,500 pounds.
3. 6,750 pounds.
- 6,750 pounds.
Explanation:
- Look at load factor for the angle of bank
- Multiple load factor and airplane weight
During a spin to the left, which wing(s) is/are stalled?
1. Neither wing is stalled.
2. Only the left wing is stalled.
3. Both wings are stalled.
- Both wings are stalled.
Explanation: In a spin, both wings are typically stalled. A spin occurs when the angle of attack of both wings exceeds the critical angle of attack, resulting in a loss of lift and an uncontrolled downward rotation of the aircraft. As the aircraft enters the spin, both wings experience a stalled condition, with disrupted airflow over their surfaces. This stall condition, combined with the yawing motion of the aircraft, results in the characteristic spinning motion of a spin.
Which basic flight maneuver increases the load factor on an airplane as compared to straight-and-level flight?
1. Stalls.
2. Turns.
3. Climbs.
- Turns.
Explanation: The load factor increases at a terrific rate after a bank has reached 45° or 50°. The load factor for any aircraft in a coordinated level turn at 60° bank is 2 Gs. The load factor in an 80° bank is 5.76 Gs. The wing must produce lift equal to these load factors if altitude is to be maintained.
(PAR-AF-20) (Refer to Figure 72.) What load factor would be created if positive 15 feet per second gusts were encountered at 120 mph?
1. 2.8
2. 3
3. 2
- 2
Explanation
Look at the information given and then determine on y-axis what the load factor is
What is the effect of advancing the throttle in flight?
1. The aircraft will accelerate, which will cause a turn to the right.
2. Airspeed will remain relatively constant but the aircraft will climb.
3. Both aircraft groundspeed and angle of attack will increase.
- Both aircraft groundspeed and angle of attack will increase.
During an approach to a stall, an increased load factor will cause the aircraft to
1. Have a tendency to spin.
2. Stall at a higher airspeed.
3. Be more difficult to control.
- Stall at a higher airspeed.
Explanation: increase in load factor (G-forces), stall speed increases
(PAR-AF-17) (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?
1. 1,200 pounds.
2. 3,100 pounds.
3. 3,960 pounds.
- 3,960 pounds.
Explanation:
- Look at load factor for the angle of bank
- Multiple load factor and airplane weight
Changes in the center of pressure of a wing affect the aircraft’s
1. Lifting capacity.
2. Aerodynamic balance and controllability.
3. Lift/drag ratio.
- Aerodynamic balance and controllability.
Explanation: think about the balance of the CG (center of gravity) and CP (center of pressure)
The amount of excess load that can be imposed on the wing of an airplane depends upon the
1. Speed of the airplane.
2. Position of the CG.
3. Abruptness at which the load is applied.
- Speed of the airplane.
Explanation: If at any time during a turn the AOA becomes excessive, the aircraft stalls.
What force makes an airplane turn?
1. The horizontal component of lift.
2. Centrifugal force.
3. The vertical component of lift.
- The horizontal component of lift.
In what flight condition must an aircraft be placed in order to spin?
1. Stalled.
2. In a steep diving spiral.
3. Partially stalled with one wing low.
- Stalled.
