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CHAPTER ONE
T-34C OUT-OF-CONTROL FLIGHT
recover quicker than from an erect spin because of greater rudder effectiveness and undisturbed
airflow over the vertical fin and rudder. Conversely, in a T-tail design, the vertical stabilizer and
rudder are more effective in an erect spin (Figure 1-3).
Figure 1-3 Tail Design
On the T-34C, a dorsal fin is added to provide more vertical tail area for directional stability
during large sideslip angles. Ventral fins and strakes on the tail are included to improve
directional stability and enhance spin characteristics and recovery. They aid in damping
oscillations in pitch, surges in rotation, and help to prevent the tail from going to excessively
high vertical angles (Figure 1-4).
Figure 1-4 Dorsal and Ventral Fins
INTRODUCTIONS AND SPINS 1-3


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