Chapter 2.6 - Stalls, Spins & Spiral Dives

Question 1

A Stall can occur if (2)?

Answer 1

• Angle of Attack is increased too far.

- Airspeed is allowed to get too low.

Question 2

What is a Stall?

Answer 2

When the Airflow on the upper surface of a wing becomes turbulent and thus decreasing in Lift.

Question 3

When does a Stall occur?

Answer 3

Angle of Attack is 16° or more.

Question 4

If the Angle of Attack is increased above 16° what happens to Lift & Drag?

Answer 4

• Lift will decrease.

- Drag will increase.

Question 5

In summary what happens in a Stall (3)?

Answer 5

• Lift is reduced.
• Drag is increased.
• Centre of Pressure moves rearward.

Question 6

True or False. A Wing will always Stall at the same Stalling Angle?

Answer 6

True.

Question 7

True or False. A Wing will always Stall at the same Airspeed?

Answer 7

False.

Question 8

Name the exceptions to the constant Stalling Angle?

Answer 8

• When Flaps are lowered.

- Upper Surface is covered with Frost.

Question 9

Name types of factors which can affect the Stalling Speed (5)?

Answer 9

• Weight.
• Flaps.
• Power (RPM).
• Frost/Ice.
• Manoeuvring Flight.

Question 10

How does Weight effect the Stall Speed of an Aircraft?

Answer 10

The lighter the Aircraft the lower the Stall Speed from Maximum Weight.

Question 11

How do Flaps lower the Stall Speed?

Answer 11

The Aerofoil shape is altered by increase in Camber.

Question 12

Name two factors on how an increase in RPM lowers the Stall Speed?

Answer 12

• Increase in Slipstream over the Wing.

- Increase in Thrust-line (which adds Lift).

Question 13

True or False. Altitude can affect the Stall Speed of an Aircraft?

Answer 13

False.

Question 14

What effects can Frost/Ice have on Stall Speed?

Answer 14

Any build-up will increase the Weight on a Wing and therefore increase the Stall Speed.

Question 15

Define High-Speed Stall?

Answer 15

A Stall which occur during manoeuvring flight.

Question 16

Name symptoms of Stall (4)?

Answer 16

• Stall Warning.
• Control Wheel/Yoke Buffeting/Shaking.
• High Nose Attitude and/or Low Airspeed.
• Sloppy Control Response.

Question 17

What’s the primary aim of Stall Recovery?

Answer 17

To regain full control of the Aircraft with minimum loss of height.

Question 18

How does a pilot recovery from a Stall?

Answer 18

• Reduce Angle of Attack by lowering the Nose of the Aircraft.
• At same the time apply Full Power to minimise loss in height.

Question 19

Define Autorotation?

Answer 19

Self-sustaining Rolling and Yawing motion.

Question 20

What information best describes the difference between a Spin and Spiral Dive?

Answer 20

Airspeed.

Question 21

What attribute in Airspeed is linked to Spin Dive?

Answer 21

Low constant Airspeed.

Question 22

What attribute in Airspeed is linked to Spiral Dive?

Answer 22

High and increasing Airspeed.

Question 23

When an Aircraft experiences Autorotation. What Control is ineffective?

Answer 23

Pitch Control.

Question 24

Where can a pilot find the appropriate Spin Recovery Technique?

Answer 24

Pilot’s Operating Handbook.

Question 25

Describe a Spin Recovery (4)?

Answer 25

• Close Throttle and Ailerons neutral.
• Apply Full Opposite Yaw Rudder.
• When Airspeed increases release Opposite Rudder and Control Wheel to neutral.
• Add Power and recover gentle.

Question 26

What’s an Upright Spin?

Answer 26

Sky appears above the nose.

Question 27

What’s an Inverted Spin?

Answer 27

Ground appears above the nose.

Question 28

Where can a pilot find the appropriate Spin Recovery Technique?

Answer 28

Pilot’s Operating Handbook.

Question 29

Describe a Spiral Recovery (4)?

Answer 29

• Close Throttle.
• Stop Roll with Ailerons (Wings Level).
• Pull out of Dive.