*Harvard makes auto differential like device one million times smaller for
Micro UAVs <http://feedblitz.com/r.asp?l=49826835&f=64651&u=17726256&c=0>*

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Engineers at Harvard University have created a millionth-scale automobile
differential to govern the flight of minuscule aerial robots that could
someday be used to probe environmental hazards, forest fires, and other
places too perilous for
people.<http://www.feedblitz.com/t2.asp?/64651/17726256/0/https://www.seas.harvard.edu/news-events/press-releases/tiny-flying-bots-benefit-from-car-like-drivetrain>.
The device is literally one one-millionth the size of what you’d find in
your car.

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Their new approach is the first to passively balance the aerodynamic forces
encountered by these miniature flying devices, letting their wings flap
asymmetrically in response to gusts of wind, wing damage, and other
real-world impediments.

“The drivetrain for an aerial microrobot shares many characteristics with a
two-wheel-drive automobile,” said Pratheev S. Sreetharan, a graduate student
in Harvard's School of Engineering and Applied Sciences. “Both deliver power
from a single source to a pair of wheels or wings. But our PARITy
differential generates torques up to 10 million times smaller than in a car,
is 5 millimeters long, and weighs about one-hundredth of a gram.” PARITy is
an acronym for Passive Aeromechanical Regulation of Imbalanced Torques.

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