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Say hello to HAMR-Jr, the little robot鈥攊nspired by insects鈥攖hat can do incredible things.

This machine, , gives a whole new meaning to the word small: HAMR-Jr can just about squeeze onto the surface of a penny and weighs far less than a paperclip.

But don鈥檛 let its size fool you. This four-legged robot can also carry up to 10 times its own weight in cargo and hits top speeds that, for its size, are comparable to a cheetah bounding over the Serengeti.

"HAMR-Jr can achieve gaits that approach an animal-like mechanical dexterity, demonstrating that we do not need to compromise design complexity or manufacturability to reduce the size of our robots,鈥� said Jayaram, an assistant professor in the Paul M. Rady Department of Mechanical Engineering.

Jayaram led the design of this little-robot-that-could while he was working as a postdoctoral scholar in Harvard鈥檚 led by Professor Robert Wood. (HAMR stands for the Harvard Ambulatory MicroRobot). It鈥檚 half the length of its predecessor, HAMR-VI, making it one of the smallest and fastest robots in the world.

The engineer has big plans for little robots like it. One day, Jayaram said, machines the size of HAMR-Jr could crawl into airplane engines or other spaces where mechanics can鈥檛 reach to conduct needed inspections. They might even perform surgeries on human patients.鈥淚 want to build robots that can get out of the lab and run around like bugs,鈥� he said.

Jayaram will present his group鈥檚 results virtually today at the (ICRA 2020).听

The misunderstood cockroach

For the engineer, who joined CU Boulder this year, the project is the latest in a long line of robotic designs that take their inspiration from an unlikely source: the much-maligned cockroach.

Jayaram previously built a small robot, , that could squish down to fit into seemingly impossible spaces, just like the urban pest can. Another of was able to ram head-first into a wall and keep on running鈥攁gain, like a cockroach.听

鈥淚 never liked cockroaches before graduate school,鈥� Jayaram said. 鈥淏ut then, over the years, I was like, 鈥榊eah, you鈥檙e pretty disgusting. But you鈥檙e also pretty useful as a model organism that we can learn things from.鈥欌��

HAMR-Jr, which was designed to mimic the speed and maneuverability of the loathed insect, brought its own set of engineering challenges.

Take power. Traditional motors won鈥檛 work in a robot this size. They overheat when they get too small. So, the Harvard team powered HAMR-Jr using tools called 鈥減iezoelectric actuators鈥濃�� thin materials that bend when you hit them with an electric voltage.听

HAMR-Jr may also be one of the most high-tech paper airplanes out there. To make a robot that small, Jayaram explained, the researchers begin by using a laser to etch the shape of its body parts into a sheet of carbon fiber composite.听

鈥淲e make everything in a plane as a two-dimensional structure and fold it up like origami to make the three-dimensional structure,鈥� Jayaram said. 鈥淚t takes a lot of time looking under a microscope to get it to work.鈥�

Small robots, big promise

Those sore eyes paid off: HAMR-Jr can turn right and left and even scoots backward. It also runs at a pace of nearly 14 of its own body lengths, or about one foot, per second. For comparison, cheetahs, the speed demons of the mammal world, sprint at roughly 16 body lengths per second.

HAMR-Jr is just the beginning, Jayaram added. Engineers could, theoretically, use his team鈥檚 same methods to make even more petite robots鈥攖he size of a pencil eraser or smaller.

鈥淲e showed that our design and fabrication methodology is highly scalable,鈥� Jayaram said. 鈥淲e could shrink everything down or scale it up, and the robot would still work.鈥�

Now at CU Boulder, Jayaram wants to see what other inspirations he can glean from insects: Could he make a tiny robot with six or eight legs, instead of HAMR-Jr鈥檚 four? What about a small robot that is flexible enough to survive getting stepped on?听

There鈥檚 nothing you can鈥檛 do, in other words, when you鈥檝e got cockroaches on your side.听

鈥淚鈥檓 interested in problems that are at the edges of biology and engineering,鈥� Jayaram said. 鈥淲hat can biology do that engineering can鈥檛?鈥�

Coauthors on the new study include Harvard researchers Jennifer Shum, Samantha Castellanos, E. Farrell Helbling and Robert Wood.