Stalling

Question 1

A stall is caused by the blank blank gradient.

Answer 1

Adverse pressure gradient.

Question 2

How can you increase the adverse pressure gradient?

Answer 2

Increase angle of attack.

Question 3

What happens to downwash during a stall?

Answer 3

It is reduced?

Question 4

When is a Vsr used

Answer 4

In an aircraft with low aspect ratio.

Question 5

When is a Vso used?

Answer 5

During landing.

Question 6

What does drag do to range?

Answer 6

Reduces it.

Question 7

Give an example of when drag is a good thing.

Answer 7

Slowing down / steeper decent.

Question 8

At what velocity does the lift to drag max ratio occur?

Answer 8

Minimum drag velocity?

Question 9

Lift = weight + blank

Answer 9

Downforce.

Question 10

What position of the centre of gravity would have the same effect as getting heavier?

Answer 10

Forward CoG.

Question 11

Where would you move the centre of gravity to reduce the stall speed?

Answer 11

Backwards.

Question 12

What do trailing edge devices do to alpha crit and CL max?

Answer 12

Alpha CRIT decreases whilst CLmax increases.

Question 13

What do leading edge devices do to alpha crit and CL max?

Answer 13

Increases both.

Question 14

What do trailing edge devices do to Vstall?

Answer 14

Decreases Vstall.

Question 15

What happens to the angle off attack when you deflect an aileron?

Answer 15

It increases.

Question 16

When should you not use ailerons?

Answer 16

At close to the stall speed.

Question 17

To roll right, you deflect the left aileron. What happens if the left wing reaches alpha CRIT?

Answer 17

The left wing stalls and rolls left.

Question 18

Whats the equation for load factor?

Answer 18

Lift / weight.

Question 19

How is load factor proportional to V stall?

Answer 19

n & Vstall ^2.

Question 20

What angle of attack does the aircraft have to surpass for a deep stall to occur?

Answer 20

Alpha CRIT.

Question 21

What stalls in a deepstall?

Answer 21

Wing and stabiliser.

Question 22

What type of aircraft are more prone to deep stalls.

Answer 22

T tail and swept wing.

Question 23

Aircraft prone to deep stalling require a blank blank which will automatically lower the nose before a stall occurs.

Answer 23

Stick pusher.

Question 24

What do ice and heavy rain do to alpha crit and CL max?

Answer 24

They reduce them.

Question 25

At what mach speed does Vstall increase.

Answer 25

Mach 0.4.

Question 26

How is Vstall proportional to mass?

Answer 26

Vstall & /mass.

Question 27

Why does Vstall increase in a turn?

Answer 27

Load factor increases.

Question 28

How do you calculate load factor in a turn?

Answer 28

n = 1/cos(bank angle)

Question 29

Whats the relationship between Vstall and bank angle?

Answer 29

Vs - -/(1/cos&)

Question 30

The load factor is greater than 1 (one) therefore the aircraft is climbing or ?

Answer 30

Turning.

Question 31

A “stall warning” can be produced synthetically by electronic means, by a system that may malfunction. What are the natural stall warnings confirming an approaching stall?

(1) Aerodynamic buffeting
(2) Increased aileron effectiveness
(3) Inability to arrest a rate of descent
(4) Stick pusher activation

Answer 31

1 and 3

Question 32

For a symmetrical wing the centre of pressure moves where as AoA increases?

Answer 32

It doesnt move.

Question 33

An aircraft with an AFT CG enters a spin. What attitude with the nose can be expected?

Answer 33

Nose level.

Question 34

What can Ice on the wings causing a stall at a lower angle of attack than the normal critical angle of attack cause? Absence of a blank blank.

Answer 34

Absence of a stall warning