Still, the robot's ability to mimic the cheetah's natural stride by flexing and unflexing its back on each step allowed it to beat the previous record of 13.1 mph, set in 1989.

DARPA and Boston Dynamics have broken their own legged-robot land speed record: Cheetah, which set a record of 18mph earlier in the year, has now been clocked at 28.3mph -- faster than Usain Bolt ...

The last fastest four-legged robot set the record in 1981 with running speed of 13.1 mph and was built in MIT. The Cheetah, funded by the Defense Advanced Research Project’s Agency (DARPA), and ...