AlphaDog Proto is a Improved BigDog and 10x Quieter (Video)

Remember BigDog from Boston Dynamics? This AlphaDog Proto is actually an improved version of BigDog and quieter. It is still a Prototype and expected to be completed in 2012.

This AlphaDog can carry a heavier load (400 lbs) than BigDog and as mentioned, it is quieter. The capabilities of this robot are to carry 400 lbs of payload on 20-mile missions in rough terrain. It is being developed by Boston Dynamics with funding from DARPA and the US Marine Corps. Here is the video.

You may also want to take a look at LittleDog and BigDog over here.
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