When a gyro is supported by two gimbal rings, how is it classified?

When a gyro is supported by two gimbal rings, it is classified as universally mounted because this configuration allows the gyro to move freely in all three rotational axes. The two gimbal rings provide the necessary support to stabilize the gyro while enabling it to maintain its orientation as the surrounding platform rotates. This setup is critical for applications requiring precise navigation, such as in inertial navigation systems and certain types of aerospace instrumentation, where maintaining accurate orientation is essential.

The universal mounting configuration effectively minimizes the impact of any orientation changes of the support platform, allowing the gyro to continue to point in a steady direction. This unique capability contrasts with other mounting classifications, which may restrict the gyro's ability to move freely or limit its motion along certain axes.