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Aviation Glossary :: Rotor Disk  Aviation Glossary :: Rotor Disk 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 Disk
Rotor Disk
The circular area traced out by the rotating blades. It is an imaginary disk that can be envisioned as the solid “wing” actually comprised of the rotating individual rotor blades. Lift is developed and distributed around the disk by the each rotating blade as it rotates to the various positions around the disk. The disk angle of attack is varied to develop and adjust the total lift and drag of the rotor disk. The rotor disk is tilted via cyclic action of the rotor blades to change the lift direction and accomplish maneuvers of the gyroplane. The rotor disk typically flies at an angle of attack of between 7 degrees to 10 degrees for normal straight and level flight. It is important in the understanding how a rotor works to be able to separately envision the actual rotor and rotor blades (their individual AOA and lift/drag forces) from the AOA, lift and drag of the whole rotor disk). The rotor disk affects the maneuvers and lift and drag of the “wing” of the rotorcraft. The individual rotor blades are controlled via cyclic differential action of their individual AOAs to result in a change in the rotor disk AOA and its lift and drag and direction of lift.
source: Glossary of Gyroplane Terms

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Disclaimer: While this glossary in most cases is likely to be highly accurate and useful, sometimes, for any number of editorial, transcription, technical, and other reasons, it might not be. Additionally, as somtimes you may have found yourself brought to this page through an automated term matching system, you may find definitions here that do not match the cotext or application in which you saw the original term. Please use your good judgement when using this resource.

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