![]() The top half of the instrument dial and horizon disc is blue, representing the sky and the bottom half is brown, representing the ground.Newer instruments do not have these restrictive tumble limits therefore, they do not have a caging mechanism.The width of the wings of the symbolic aircraft and the dot in the center of the wings represent a pitch change of approximately 2°.A knob at the bottom center of the instrument case raises or lowers the aircraft to compensate for pitch trim changes as the airspeed changes."Aircraft rotates around the instrument".Miniature aircraft connected to the aircraft while the gyro (horizon) remains in place.A horizon disk is attached to the gimbals so it remains in the same plane as the gyro, and the aircraft pitches and rolls about it.The gyro is mounted in a double gimbal, which allows the aircraft to pitch and roll about the gyro as it remains fixed in space. ![]() Its operating mechanism is a small brass wheel with a vertical spin axis, spun at a high speed by either a stream of air impinging on buckets cut into its periphery, or by an electric motor. ![]()
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