
Ch02-H6927.tex 10/7/2007 14: 22 Page 28
28 Flight Dynamics Principles
x
x
h
h
Starboard
aileron
Port aileron
Rudder
Elevator
Elevator
Positive control
angles shown
Figure 2.11 Aerodynamic controls notation.
thrust. For a turbojet engine the relationship between thrust and throttle lever angle
is approximated by a simple first order lag transfer function:
τ(s)
ε(s)
=
k
τ
(1 + sT
τ
)
(2.34)
where k
τ
is a suitable gain constant and T
τ
is the lag time constant which is typically
of the order of 2–3 s.
2.7 AERODYNAMIC REFERENCE CENTRES
With reference to Fig. 2.12, the centre of pressure, cp, of an aerofoil, wing or complete
aircraft is the point at which the resultant aerodynamic ...