Definition
The pivoted support frames that suspend a gyroscope's spinning rotor so it can remain free to maintain its orientation while the aircraft moves around it. In a typical gyroscopic instrument, two gimbal rings are mounted at right angles to each other, allowing the rotor to remain undisturbed as the airframe pitches, rolls, or yaws.
Plain English
A set of pivoting rings that hold the spinning wheel inside a gyro instrument. They let the wheel keep pointing the same way even when the aircraft tips or turns around it.
Context Anchor
Seen in discussions of gyroscopic instruments, such as attitude indicators and heading indicators.
Derivation
From the French 'cardan' and earlier Italian 'gimbale', referring to the pivoted rings used in old ship compasses to keep them level at sea. Knowing this helps because the job is the same in an aircraft: the rings isolate the spinning element from the motion of the vehicle around it.
Why Pilots Care
Gimbal rings keep gyroscopic instruments stable so pilots receive reliable attitude and heading information even when the aircraft changes attitude.
Analogy
Think of a small camera mounted in a moving holder that lets the camera stay level while the holder tilts. Gimbal rings do a similar job for the spinning part inside a gyro instrument.
Intuition Check
Gimbal rings are not just mounting hardware or decorative rings. They are moving supports that give the gyro freedom to stay aligned while the aircraft changes attitude.
Example Sentence 1
When the attitude indicator tumbled during aerobatics, the gimbal rings had reached their travel limits and the gyro lost its reference.
Example Sentence 2
A damaged gimbal ring can cause the heading indicator to precess or drift unexpectedly.