BALLU—which stands for Buoyancy Assisted Lightweight Legged Unit—is the brainchild of Dennis Hong, who works out of UCLA’s Robotics & Mechanisms Laboratory. Realizing that the biggest challenge for a bi-pedal robot was still the constant pull of gravity, Hong wanted to experiment with a bot that wasn’t always at risk of falling over and breaking.
BALLU’s helium-filled mylar torso isn’t completely weightless, it does rely on its legs to remain upright. But it’s so incredibly light its legs are almost twig-like, with basic cable-driven knees allowing it to walk forwards, backwards, and left or right. It’s remarkably stable on its feet as a result of its balloon body, and it can even walk across water without sinking and frying all of its electronics.
A robot that can be defeated with a couple of safety pins and pruning shears should give humanity a sigh of relief about the future, but what good would a bot like BALLU be in terms of practical functionality? A larger balloon torso would give it enough lift to carry sensors or other simple tools into areas too dangerous for humans to tread. And its creators are already working on a quadruped version with more lifting and load capacity. One day you could have a deflated robot stashed away in your glove box to help with emergencies—as long as they don’t involve a cactus or anything pointy.
