Chapter 1.2 - PPL Aerodynamics

Question 1

Name the three Axis of an Aircraft?

Answer 1

• Longitudinal.
• Lateral.
• Normal.

Question 2

What movement and controls are used for Longitudinal Axis (2)?

Answer 2

• Roll.

- Ailerons.

Question 3

What movement and controls are used for Lateral Axis (2)?

Answer 3

• Pitch.

- Elevators.

Question 4

What movement and controls are used for Normal Axis (2)?

Answer 4

• Yaw.

- Rudder.

Question 5

Longitudinal, Lateral and Normal Axis connects through which point in an Aircraft?

Answer 5

Centre of Gravity.

Question 6

Longitudinal Stability is the stability of the Aircraft for which motion?

Answer 6

Pitching.

Question 7

Which axis is used for Longitudinal Stability?

Answer 7

Lateral Axis.

Question 8

What main factor affects Longitudinal Stability of an Aircraft?

Answer 8

Horizontal Stabiliser (Tailplane).

Question 9

Directional Stability is the stability of the Aircraft for which motion?

Answer 9

Yawing.

Question 10

Which axis is used for Directional Stability?

Answer 10

Normal Axis.

Question 11

What main factor affects Directional Stability of an Aircraft?

Answer 11

Vertical Stabiliser (Fin).

Question 12

Directional Stability is also known as what?

Answer 12

Weathercocking effect.

Question 13

Define Weathercocking?

Answer 13

The tendency of the Aircraft’s nose always pointing to the wind.

Question 14

Lateral Stability is the stability of the Aircraft for which motion?

Answer 14

Rolling.

Question 15

Which axis is used for Lateral Stability?

Answer 15

Longitudinal Axis.

Question 16

What main factor affects Lateral Stability of an Aircraft?

Answer 16

Wing Dihedral.

Question 17

What’s the percentage difference between the Minimum Power Speed and Minimum Drag Speed? This speed is also known as what (2)?

Answer 17

• 24% less.

- Maximum Endurance Speed.

Question 18

What terms are given when control forces must be increased/reduced (2)?

Answer 18

• Anti-Balance Tabs.

- Balance Tabs.

Question 19

Name two types of Trim Tabs?

Answer 19

• Fixed Trim Tab.

- Cockpit Controlled Trim Tabs,

Question 20

Name four factors which causes the Aircraft to ‘swing’ during Takeoff?

Answer 20

• Slipstream Effect.
• Propeller Torque.
• Gyroscopic Effect.
• Asymmetrical Blade Effect.

Question 21

During Takeoff, how does Slipstream affect the Aircraft and how can a Pilot minimise this affect?

Answer 21

• Yaws to the Left.

- By applying Right Rudder.

Question 22

True or False. Weight affects Glide Distance and Angle?

Answer 22

False.

Question 23

What happens to the Glide Angle during Headwind?

Answer 23

Increases.

Question 24

What happens to the Glide Angle during Tailwind?

Answer 24

Decreases.

Question 25

How many degrees per second is a Rate 1 turn?

Answer 25

3°.

Question 26

How many degrees per second is a Rate 2 turn?

Answer 26

6°.

Question 27

How many degrees per second is a Rate 3 turn?

Answer 27

9°.

Question 28

How many degrees per second is a Rate 4 turn?

Answer 28

12°.