
Ch10-H6927.tex 20/6/2007 16: 37 Page 260
260 Flight Dynamics Principles
Table 10.4 Short period mode damping
Level 1 Level 2 Level 3
Flight phase ζ
s
min ζ
s
max ζ
s
min ζ
s
max ζ
s
min
CAT A 0.35 1.30 0.25 2.00 0.10
CAT B 0.30 2.00 0.20 2.00 0.10
CAT C 0.50 1.30 0.35 2.00 0.25
Table 10.5 Phugoid damping ratio
Level of flying qualities Minimum ζ
p
1 0.04
20
3 Unstable, period T
p
> 55 s
10.6.3 Longitudinal manoeuvrability
The requirements for longitudinal manoeuvrability are largely concerned with
manoeuvring control force or, stick force per g. It is important that the value of
this control characteristic is not too large or too small. In other words, the controls
free manoeuvre ...