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Spin
An aircraft enters a spin in any configuration and in all the flight speed range up to the Mach number of 0.9. In any case, the spin is the result of stall at excessing available g forces during maneuvering or at the drop of speed lower than the allowable one for the current weight and flight configuration of the aircraft.
With the correct spin recovery technique taken into account and available altitude, aircraft recovery is possible from any kind of spin.
Upon entering a spin, the aircraft nose goes below the horizon to the angle of 50-75 degrees with a slow rotation. When the rotation rate increases, the aircraft nose goes up almost to the horizon. The first spin turn occurs approximately in 5-8 sec. with the altitude loss of 500-600 feet. During the next turn, the rotation rate increases with the diminution of amplitude of nosing up to the horizon and an increase of the climb angle to the vertical one.
At the same time, with each next turn the altitude loss increases and may reach 2.000 feet per turn.
Typically, the aircraft falls into right-hand spin.
A spin with increased engine thrust is characterized by smaller climb angles and higher rotation rate.
A spin with the minimal thrust or without power is characterized by steeper (up to 90 degrees in the process of development) trajectory.
The spin quality does not change with the speedbrakes deployed.
In landing configuration, the spin peculiarity is smaller altitude loss at first turns.
With external fuel tanks, a change of spin direction may occur both upon entering the spin and after several turns.