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Aviation Glossary :: Precession Stall  Aviation Glossary :: Precession Stall 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.).

Precession Stall
Precession Stall
Refers to the stalling of on or more individual rotor blade(s) due to too rapid and too large of cyclic input to the rotor system. Due to the inertial tendency of the rotor disk to maintain its initial disk attitude, a rapid and large cyclic input will create an immediate large angle of attack of at least one rotor blade – upon cyclic input, one blade will see more positive AOA, while the other blade(s) may see nearly as large negative instantaneous AOA. It is this cyclic unbalance between the rotor blades that initiates the rotor disk attitude to follow the cyclic input. However, if the cyclic input is too large or too quick before the rotor disk can adjust, it is possible that the large cyclic input will result in individual blade stall AOA. If significant high blade AOA or stall continues too long, the increased drag on the rotor blade can slow the rotor dramatically. The physical limits of 10 degrees on the rotor teeter stops and on the range of cyclic control input is intended to limit or prevent cyclic inputs over about 10 degrees where significant rotor drag would be occurring. Precession stall could be initiated by too rapid and large of cyclic input from the pilot or by a similar uncommanded cyclic input from airframe motions. Precession stall that slows the rotor too much will be unrecoverable as the centripetal forces on the slowed rotor may no longer sustain the weight of the gyro.
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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