I thought a few people might find this interesting.
There's been some mention on the U3-X previously however the prototype has been recently demonstrated in New York. Although it won't be replacing active legs in the short term, there are some areas where its use can come in handy.
The balancing system was extensively developed on the ASIMO project.
Some quick specs:
Height 25.6In
Weight <10kgs
Battery Lithium Ion
Operating time 1 hour
There's a bit more information here.
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