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tw1984

spot dog is hydraulically powered junk, unitree is motor driven from day one. Boston Dynamics was forced to switch to a motor driven architecture after it is proven by unitree.

Boston Dynamics is the follower here.

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I look after one at a University that gets used for teaching & outreach & there's definitely no hydraulics on the thing.

They moved to motors from their older high speed hydraulics. I don't know if it was after unitree or not.

why is hydraulics junk?

Perhaps because of the potentially slower actuation speed, but you also generally get a lot more power from hydraulics so im not sure one can claim it is junk. Far less acrobatic, but also far more sumo wrestler.

Less fit for impressive youtube videos. I'm sure they have other boring utilities for the technology.

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