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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,
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PRECESSION
| PRECESSION | | | The tilting or turning of a gyro in response to deflective forces causing slow drifting and erroneous indications in gyroscopic instruments. | | source: FAA Airplane Flying Handbook (FAA-H-8083-3A) |
| | | The characteristic of a gyroscope that causes a force to be felt, not at the point of application, but at a point 90° in the direction of rotation from that point. | | source: FAA Aviation Maintenance Technician Airframe Handbook (FAA-H-8083-31) |
| | | The characteristic of a gyroscope that causes an applied force to be felt, not at the point of application, but 90° from that point in the direction of rotation. | | source: FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25A) |
| | | The property of a spinning object (gyroscope, child’s top, rotor, propeller, etc.) that resists a change in angle of its spinning axis. The strength of the precession resistance is a function of both the RPM of the spinning object and its Moment of Inertia – or the Inertia (mass or weight) of the spinning object. Precession causes a spinning rotor disk to resist changing attitude. This resistance to changing attitude is fundamental to the cyclic action of a gyroplane’s rotor control. A characteristic of precession in a spinning object is that the spin axis (or plane of rotation of a rotor) responds in tilt 90 degrees after a force is applied to try to tilt the spinning object. The cyclic change in the rotor blade AOA applies a lift force at that point in the rotation, and the rotor disk responds in tilt ¼ of the rotation later. | | 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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