Aerodynamic Principles
Out-of-Control Flight
Good for Erect Spins;
Poor for Inverted Spins
Good for Both Erect
and Inverted Spins
Poor for Erect Spins;
Good for Inverted Spins
Figure 14: TAIL DESIGN
A third factor which affects spin recovery is the aircraft relative density factor, which is given by the follow-
ing equation:
= Aircraft Density = M/Sb
Air Density
p
Heavily loaded tactical aircraft have density factors as high as 100. Light civilian aircraft have density
factors around 25.
(9-98) Original
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