Flying Controls

Question 1

The longitudinal, vertical and lateral axis acts through the?

Answer 1

Centre of Gravity

Question 2

When the effect of ailerons and elevator are combined, this is called?

Answer 2

Elevons

Question 3

When the effect of rudder and elevator is combined, this is called?

Answer 3

A ruddervator

Question 4

Aileron drag, or adverse aileron yaw, is?

Answer 4

an initial yaw in the opposite direction of the applied roll

Question 5

Adverse aileron yaw is mostly experienced at?

Answer 5

Low airspeed and high angle of attack

Question 6

Adverse aileron yaw is caused by?

Answer 6

The down going aileron experiencing more drag than the up going aileron

Question 7

what is the purpose of differential ailerons and how do they function?

Answer 7

Differential ailerons are used to combat adverse aileron yaw, and it works by limiting the down going aileron’s movement.

Question 8

The systems used for counteracting adverse aileron yaw is?

Answer 8

1. Differential Ailerons
2. Frise ailerons
3. Spoilers
4. Coupled controls
5. slot-cum-ailerons

Question 9

the systems used for control balancing(relief of control pressure):

Answer 9

1. The set back or inset hinge
2. The horn balance
3. Tab balances of varies types

Question 10

Adverse aileron is caused by an increase in -

Answer 10

induced drag of the up going wing, on the side with the down going aileron

Question 11

Mass balancing is used to reduce -

Answer 11

flutter

Question 12

Stick forces are high for -

Answer 12

High speed and large aircraft

Question 13

In order to reduce stick forces the hinge moment should be -

Answer 13

reduced

Question 14

Spring tabs:

A spring tab is inserted between the tab and the main control surface and so modifies the system in two ways:

1. The amount of tab movement is ______ with ________ speed, thus preventing the action from being too _____ when speeds are ___
2. The tab does not become operational until the main control has been deflected through a certain arc or until a certain control force is exerted

Answer 14

1. The amount of tab movement is reduced with increasing speed, thus preventing the action from being too violent when speeds are high
2. The tab does not become operational until the main control has been deflected through a certain arc or until a certain control force is exerted

Question 15

When a turn is initiated, adverse yaw is:

Answer 15

The tendency of an aeroplane to yaw in the opposite direction of turn mainly due to the difference in induced drag on each wing

Question 16

When roll spoilers are extended, the part of the wing on which they are mounted:

Answer 16

Experiences a reduction in lift, which generates the desired rolling moment. In addition, there is a local increase in drag, which suppresses adverse yaw

Question 17

A jet transport aeroplane exhibits pitch up when thrust is suddenly increased from an equilibrium condition, because the thrust line is below the:

Answer 17

CG

Question 18

If the thrust line lies below the centre of gravity, the aircraft will display a tendency to -

Answer 18

pitch up when thrust in increased.