Tag Archives: static lateral stability

How can the designer of an aeroplane with straight wings increase the static lateral stability?

A: By fitting a ventral fin (a fin at the under side of the aeroplane).
B: By increasing the aspect ratio of the vertical stabiliser, whilst maintaining a constant area.
C: By applying wing twist.
D: By increasing anhedral.

 

 

 

 

 

 

 

 

Answer: B

Positive static lateral stability is the tendency of an aeroplane to:

A: roll to the right in a right turn.
B: roll to the left in the case of a sideslip angle (with the aeroplane nose pointing to the right of the incoming flow).
C: roll to the left in the case of a sideslip (with the aeroplane nose pointing to the left of the incoming flow).
D: roll to the left in a right turn.

 

 

 

 

 

 

 

 

Answer: C

An aeroplane exhibits static longitudinal stability, if, when the angle of attack changes:

A: the resulting moment is positive.
B: the change in total aeroplane lift acts through the centre of gravity.
C: the change in total aeroplane lift acts aft of the centre of gravity.
D: the change in wing lift is equal to the change in tail lift.

 

 

 

 

 

 

 

 

Answer: C

Static lateral stability should not be too large, because:

A: too much rudder deflection would be required in a crosswind landing.
B: too much aileron deflection would be required in a crosswind landing.
C: constant aileron deflection would be required during cruise in case of crosswind.
D: the roll trim sensitivity would increase sharply.

 

 

 

 

 

 

 

 

Answer: B