It’s called a slip ring. They use a data bus and power so there aren’t a million rings trying to transfer information from each sensor or component individually. It’s the same way you have buttons and a horn on your steering wheel, which also rotates. Here’s an example.
[https://www.moog.com/products/slip-rings/aerospace-military-slip-rings/vehicular-slip-rings.html](https://www.moog.com/products/slip-rings/aerospace-military-slip-rings/vehicular-slip-rings.html)
The same way the buttons on a modern passenger car steering wheel control the radio, dash ect.
A copper disc with contact points connecting buttons in the wheel with a computer. Instead of wires getting twisted in a circle. It’s a disc fixed to the vehicle and a disc attached to the wheel”turrent” in which no matter which position or how many times you spin it, the metal contacts conduct current
Related, turrets are not physically connected to the body of they tank, they just ‘Rest’ on it. When you see a tank that has been hit by a missile, the turret is generally a few feet away. They do weigh several tonnes on its own, so it’s not going to blow away in high winds, but its not held down by anything other than gravity.
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