
Ch10-H6927.tex 20/6/2007 16: 37 Page 263
Flying and Handling Qualities 263
the lift curve slope. Thus substituting equations (10.28)–(10.30) into equation (10.26)
the expression for CAP reduces to the important result
CAP =
mg
c
I
y
H
m
=
g
c
k
2
H
m
(10.31)
where k denotes the longitudinal radius of gyration. Since aircraft axes are assumed
to be wind axes throughout then U
e
≡V
0
. Thus, it is shown that CAP is directly
proportional to the controls fixed manoeuvre margin H
m
and that the constant of
proportionality is dependent on aircraft geometry and mass distribution.
10.8 LATERAL–DIRECTIONAL FLYING QUALITIES REQUIREMENTS
10.8.1 Steady lateral–directional control
Unlike ...