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FLIGHT INSTRUCTOR'S MANUAL   193
   The vertical reversement is useful in both cases, due to the following requirements for its proper execution:
   1. It requires accurate performance and a good understanding of steep turns.
   2. It accentuated errors which result from either violent, improperly timed, or improperly coordinated pressures, as well as from efforts which are applied in too cautious a manner. 
   3. It demands prompt perception of gain or loss of speed, and quick, accurate physical reactions.
   4. It requires that a high degree of orientation be maintained during rapid and unusual movements of the airplane.
   5. It requires trained responses, rather than impulsive or erratic reactions.
   6. It accentuates the importance of proper timing and relaxation, particularly at speeds less than normal.

FIGURE 30.-The vertical reversement.

   For the purposes described above, the more controlled type is much more valuable than the true snap type. This type is more fully discussed since the snap type, as stated before, is merely a half snap roll or less vertical bank and recovery made when in the opposite bank of approximately the same degree. When so performed, it should be stopped accurately, without slipping, and the turn continued in the opposite direction without adjustment or errors. 
   The controlled type is executed from a 60* to 70* bank by applying firm pressure on the top rudder and, as the airplane starts to respond to its use, pulling the stick straight back. The ailerons are then added to assist in the rolling while the pressures are maintained and increased on the rudder and stick. The airplane will start into a steep climb at the same time rolling around its longitudinal axis in the direction of the application of the ailerons and rudder. Before