Tag Archives: CG

Which of the following is most likely to affect the range of centre of gravity positions on an aeroplane?

A: Elevator and tailplane (horizontal stabiliser) effectiveness in all flight conditions.
B: Location of the undercarriage.
C: The need to maintain a low value of stalling speed.
D: The need to minimise drag forces and so improve efficiency.

 

 

 

 

 

 

 

 

Answer: A

The centre of gravity of an aeroplane is at 25% of the Mean Aerodynamic Chord. This means that the centre of gravity of the aeroplane is situated at 25% of the length of:

A: the aeroplane in relation to the leading edge
B: the mean aerodynamic chord in relation to the trailing edge
C: the mean aerodynamic chord in relation to the datum
D: the mean aerodynamic chord in relation to the leading edge

 

 

 

 

 

 

 

 

Answer: D

The aft movement of the centre of pressure during the acceleration through the transonic flight regime will:

A: decrease the static lateral stability.
B: increase the static lateral stability.
C: decrease the longitudinal stability.
D: increase the static longitudinal stability.

 

 

 

 

 

 

 

 

Answer: D

Which of the following statements is correct?

A: A tail heavy aeroplane is less stable and stalls at a lower speed than a nose heavy aeroplane
B: The station (STA) is always the location of the centre of gravity in relation to a reference point, normally the leading edge of the wing at MAC
C: The centre of gravity is given in percent of MAC calculated from the leading edge of the wing, where MAC always = the wing chord halfway between the centre line of the fuselage and the wing tip
D: If the actual centre of gravity is located behind the aft limit the aeroplane longitudinal stability increases.

 

 

 

 

 

 

 

 

Answer: A