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The Aeroplane Speaks by H. (Horatio) Barber
page 24 of 183 (13%)
with the Rigger to wash-out, that is decrease, the Angle
of Incidence on one side of the Aeroplane, and to effect
the reverse condition, if it is not too much trouble, on the
other side.''

``But,'' objected Efficiency, ``the Lift varies with the
Angle of Incidence, and surely such a condition will result in
one side of the Aeroplane lifting more than the other side?'

``That's all right,'' said the Propeller, ``it's meant to
off-set the tendency of the Aeroplane to turn over sideways
in the opposite direction to which I revolve.''

``That's quite clear, though rather unexpected; but how
do you counteract the effect of the gusts when they try to
overturn the Aeroplane sideways?'' said she, turning to
Lateral Stability again.

``Well,'' he replied, rather miserably, ``I'm not nearly
so perfect as the Longitudinal and Directional Stabilities.
The Dihedral Angle--that is, the upward inclination of the
Surfaces towards their wing-tips--does what it can for me,
but, in my opinion, it's a more or less futile effort. The
Blackboard will show you the argument.'' And he at once
showed them two Surfaces, each set at a Dihedral Angle
like this:

``Please imagine,'' said the Blackboard, ``that the top
V is the front view of a Surface flying towards you. Now
if a gust blows it into the position of the lower V you see
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