I would guess powered by cable. It would make a lot of sense. Plus one can see at least two cables.
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had this idea ten years ago! Better way to do is yes water cables from building supply and drone hanging from a roof rig
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Laser armed, Stone cleaning Drone to clean up old building from polution.
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Out of curiosity why would one have a drone( multicoptors) , if some sort of tethered rover might be far more easier and energy efficient ..,
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totally agree from efficiency, but it might be faster to deploy than a gantry, perhaps more flexible
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Why not both? Using the high pressure water to turn a turbine means you only need a small battery to get into position.
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