While a purring, smooth running engine is certainly desirable, it's only one piece of a much more complicated vibration pie. We attempt to get a handle on what the causes of abnormal vibrations are, and how to reduce and possibly cure the problem by a systematic approach. Vibration is denned as "a periodic, usually rapid oscillatory motion of an elastic or rigid body suddenly released from tension." That's a rather complex way of describing something as benign as a tremor across the fluid of a wet compass. It does not, however, go far enough in depicting the hell that breaks loose when six inches of propeller tip departs the engine. In the broadest sense, vibration must be looked at as a condition that falls into one of two separate categories: normal and abnormal.
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