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.).

Spindle

The central rotating pivot of the 2-Blade semi-rigid rotor system commonly used on sport gyroplanes. The spindle employs a bearing upon which the rotor spins and the weight of the gyro is supported. The Spindle of a 2-Blade semi-rigid rotor system is normally moveable around the lateral and longitudinal axis (pitch and roll) in order to provide cyclic control inputs to the rotor via cyclic stick inputs. The angle mis-match between the spindle axis and the axis of rotation of the rotor creates the cyclically differential AOA of each rotor blade according to its position around the rotor disk. The spindle axis angle also can change upon pitch or roll movements of the airframe (“uncommanded” cyclic inputs) or g-load pitch compensation provided by the offset gimbal arrangement on common 2-Blade semi-rigid rotor systems.

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.