(click thru to witness an amazing video)
Here’s an excerpt from the accompanying article:
Designing an automated fly implied having the ability to make
lightweight, miniature working parts, a process that Wood says took up
the bulk of his doctoral study, because of the lack of any previous
research on which to draw. “For years, the thrust of our work was ‘How
do we do this?’” says Wood. “There was no existing fabrication
paradigm, given the scale we were operating on, the speed we wanted to
operate with, and things like cost, turnaround, and robustness.” His
research group developed and fabricated a laser carving system that
could meticulously cut, shape, and bend sheets of carbon fiber and
polymer—both strong but lightweight materials—into the necessary
And how to power those wings to beat 120 times
per second? To keep this 60-milligram robot (the weight of a few grains
of rice) with a 3-centimeter wingspan to a minimal size and weight,
Wood says, you can’t simply use a shrunken version of the heavy DC
(direct current) motors used in most robots. So he and his team settled
on a simple actuator: in this case, a layered composite that bends when
electricity is applied, thereby powering a micro-scale gearbox hooked
up to the wings. Wood says the actuator works even better than its
biological inspiration. The power density—a measure of power output as
a function of mass—of a fly’s wing muscles is around 80 watts per
kilogram; Wood’s wing design produces more than 400 watts per kilogram.
That’s some kick-ass engineering at work. Professor Wood, you are one gnarly dude.
Many thanks to the folks at Telstar Logistics, a key member of the metacool horizontal keiretsu, for bringing this innovation to the attention of our R&D group.
Wow, that is pretty insane! And very cool.