Figure included in web address below shows that, as a
consequence of changes in an aircraft’s flight conditions (e.g.
velocity, angle of attack etc.), the line of action of the lift
force is no longer coincident with the centre of mass of the
aeroplane. Instead, it is shifted forwards by a distance of
dL.1. Explain the result of this change on the stability of the
aeroplane. Write down the change in the magnitude of the moment
of force.2. With the help of a sketch, explain how the stability
of the aeroplane can be reinstated. Write down the balanced
moment equation.http://i1169.photobucket.com/albums/r503/weemanj
oe/airplane.jpg 1. The change of position of the lift force will
induce a moment equal to FL*dL in the clockwise direction. This
will cause the aircraft to nose up. 2. Stability can be
reintroduced by inducing a moment equal and opposite of that
induced by the life force. However, for the value of the
question I cannot submit a drawing.