Lift augmentation

Question 1

when using flaps, what causes the nose down moment?

Answer 1

The aft movement of the centre of pressure

Question 2

The type of tailplane not effected by flap downwash, and a resulting pitch up moment, is?

Answer 2

T tail

Question 3

The listed devices is in which category of lift augmentation:

1. The plain or cambered flap
2. Slotted flaps
3. Double slotted flaps
4. Split flap
5. Fowler flap

Answer 3

Trailing edge flaps

Question 4

The listed devices is in which category of lift augmentation:

1. krueger flap
2. Slats and slots

Answer 4

Leading edge devices

Question 5

Which type of leading edge device:

This is a nose flap which hinges about the leading edge of the inboard section of a wing. It is usually used for increasing lift on high speed aerofoils during the take-off and landing phase and either retracts or extends with the trailing edge flaps.

Answer 5

Krueger flap

Question 6

Which type of leading edge device:

This is simply a small auxiliary aerofoil, placed along the leading edge of the main aerofoil section, able to move forwards or backwards thus opening or closing the gap(called a slot) respectively. The effect is to re-energise the airflow over the upper surface of the aerofoil, thus delaying the separation of the boundary layer to the extent that the stalling angle may be increased considerably allowing the aeroplane to fly at higher angle of attack.

Answer 6

Slats and slots

Question 7

Slots may be fixed or automatic. Which slots have the disadvantage of increased drag?

Answer 7

Fixed slots

Question 8

Slots may be fixed or automatic. Operation of automatic slots depend on the action of the -

Answer 8

forward and upward suction near the leading edge.