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cool idea but that seems very hard. Resistance goes up with distance, and tiny wires (100 µm or so for fiber) would have high resistance and low current capacity).

https://news.ycombinator.com/item?id=38865518

Yes, SPE could get you ~1km. https://electricui.com/blog/spe-sensor-node

each extra drone is more power needed to keep the drones and wire in the air. More power requirements means bigger wires, bigger wires mean more resistance, which means more power

In addition, every drone has dependency on all of the drones previously. Failure at any point in the chain will cause failure in the entire system.

So in essence, there is a limit to how far you can chain drones together and they will be very vulnerable to catastrophic failure.

You also have more and more drones to control and send signal to.

could it be done? yes. viable/useful? doubtful

Could that be done with a high powered laser, rather than wire, I wonder.