ESDU 24001
Spinning
Abstract:
ESDU 24001 is an introduction to the physical principles underlying aircraft spinning. It is the first of two Data Items, the second of which, dealing with wind-tunnel and flight-testing techniques associated with spinning, will be issued later.
ESDU 24001 describes how spins may be categorised as erect or inverted, and further sub-categorised from flat to steep according to the angle of attack measured from the vertical spin axis. The different phases of spin, ie entry phase, incipient phase, developed phase and recovery phase, are then identified and described. A detailed analysis of the 'ideal' developed spin about a vertical axis, in which aerodynamic, gravitational, and inertial forces are always in equilibrium, is then presented to show how spin is influenced by aircraft attitude and to show the effect of such features as fuselage cross-sectional shape and how these can be modified by the addition of aerodynamic 'fixes', such as strakes.
The effect of control deflection during recovery from both erect and inverted spins are then discussed, also the characteristics of oscillatory spins.
Finally, aircraft design principles and related criteria, either to avoid spinning or ensure controlled recovery, are described.
Indexed under:
- None
Details:
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