8.4

Question 1

What’s the difference between manoeuvrability and controllability

Answer 1

Manoeuvrability- The quality of an aircraft that allows it to be manoeuvred easily and to withstand the stresses imposed by manoeuvres.

Controllability- The capability of an aircraft to respond to the pilot’s control, especially regarding flight path and attitude.

Question 2

What movement does yaw act on and what axis is it stable on

Answer 2

Acts on Vertical
Stable on vertical

Question 3

What axis does roll act on and what axis is it stable on

Answer 3

Acts on Longitudinal
Stable on lateral

Question 4

What axis does pitch act on and what axis is its stability along

Answer 4

Acts on lateral
Stable on longitudinal

Question 5

What’s static stability

Answer 5

Refers to the initial tendency of the aircraft to return back to a position of equilibrium

Question 6

What’s the difference between a positive, neutral and negative static stability

Answer 6

Positive tends to return back to its initial state of equilibrium after being disturbed

Neutral tends to stay at its new attitude when it’s been disturbed

Negative tends to continue to move away from its original attitude when it’s been disturbed

Question 7

What’s dynamic stability

Answer 7

Refers to ossicliations of aircraft after a aircraft movement has occurred

Question 8

What’s positive dynamic stability, neutral, negative

Answer 8

Positive is a oscillation that dampen out over time and returns to its equal state

Neutral is an oscillation that will remain and never dampen out

Negative is oscillations that will worsen over time

Question 9

What’s longitudinal stability

Answer 9

The tendency of the aircraft to go nose up or down around the lateral axis

Question 10

What 3 factors does longitudinal stability dependent on

Answer 10

Location of the wing with respect to the centre of gravity

Location of the horizontal tail surfaces with respect to the centre of gravity

Area or size of the tail surfaces

Question 11

How does the difference between the centre of gravity and the aerodynamic centre affect the longitudinal stability

Answer 11

Is the difference is big then the stability is high and if it’s small then the stability is low

Question 12

What axis does directional/weathercock stability work along

Answer 12

The vertical axis

Question 13

What two things does the directional stability depend on

Answer 13

The fin of the aircraft
Sweep back angle

Question 14

How do aircraft help to better there directional stability

Answer 14

By increasing the the surface area behind the c of g
By sweeping wings

Done using dorsal fin or keel surface

Question 15

What axis does lateral stability work about

Answer 15

The longitudinal axis

Question 16

What. 4 things can be done to make the aircraft laterally stable

Answer 16

Dihedral
Sweep-back
Keel effect
Weight distribution

Question 17

What’s sideslip

Answer 17

The angle between ac centre line and the sideslip direction

Question 18

What acts as the keel on aircraft

Answer 18

The fuselage

Question 19

When does spiral dive occur

Answer 19

When there’s greater affect on direction stability than lateral

Question 20

When does Dutch roll exist

Answer 20

When there’s greater effect on the lateral stability than the directional stability

Question 21

How can Dutch roll be reduced

Answer 21

By reducing sweep angle of wings by improving the directional stability

Increasing size of vertical stab but this can have lift and drag affects