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Aviation Glossary :: Rotor Shake  Aviation Glossary :: Rotor Shake FAA Written Test Preparation
Aviation Glossary Welcome to the Dauntless Aviation Glossary!

At Dauntless, our editorial staff maintains the web's largest unified glossary of aviation terms. This glossary is built from a combination of official, quasi-official, and proprietary sources (including original material that we develop oursselves). Uniquely, we often provide multiple definitions of a given term so that you can find that which best applies to you. In order to maximize your learning efficiency, this glossary (and similar ones for our international users) is incresingly fully integrated into our aviation learning apps, including our FAA written test prep and FAA practical test prep software and apps. If you like this glossary, you'll love them with their polished learning environments and world's best and clearest content (please do give them a try.).

Rotor Shake
Rotor Shake
The vibration of the rotor system felt in the controls and in the fuselage of a rotorcraft. The predominant vibrations are either “1 per rev” (at the same frequency as the rotor is turning) or 2-per rev (twice the freq of the rotor) in a two bladed rotor system. 1-per rev rotor shake can be the result of a mass and/or aerodynamic imbalance of the rotor. 1-per rev imbalance rotor shake can be thought of as the either the Mass Center or the Aerodynamic Center not being exactly concentric with the spinning axis of rotation of the rotor. Imperfect rotor blade tracking is a contributor to aerodynamic imbalance leading to 1-per rev rotor vibrations. 2-per rev shake can be the result of a teeter height that does not match the vertical CG of the coned rotor, mechanical “looseness” or “slop” in the rotor teeter joint, or (unavoidably) from the forward airspeed of a semi-rigid 2-blade rotor
source: Glossary of Gyroplane Terms

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