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motions. With this fact in mind the types of stability now will be considered. 

26. Types of stability.-a. Stability is defined as the tendency to return to a position of equilibrium after a small deviation from that position. 

b. In airships stability is accomplished by two means, static and dynamic. 

(1) Strictly speaking, the only real statical stability is that which exists when the engines are stopped. Under this condition an air- 

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