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A flapping-wing drone that actually handles its own vibrations. BionicBird’s X-Fly is not a propeller drone. It is an ornithopter with a six-axis gyro and precision G-sensors designed specifically to deal with the chaotic dynamics of wing flapping. • Sensor fusion tuned for flapping flight, not propeller stability •...

36,291 views • 8 months ago •via X (Twitter)

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A robot that swims underwater, then flies straight out of it! 🦢 Water is 1,000 times denser than air. Moving through one or the other normally means two completely different machines. Around 100 bird species disagree. Loons, gulls, puffins and petrels dive after prey, then leap back into the sky. Engineers at MIT and EPFL built a robot that does the same thing. It's a flapping-wing aerial-aquatic vehicle, it weighs under 300 grams, and the results are out in Science. Raphael Zufferey who runs the AURA Lab at MIT, is lead author. A waterproof motor drives a crankshaft that pumps two flexible wings up and down at set frequencies, and a motorised tail changes angle to climb or dive. The wing membranes are coated with hydrophobic nanoparticles so water sheds off them. Wing flexibility turned out to be the whole game. Flexible enough to keep flapping amplitude low in water, firm enough to hold the robot up in air. → Swims at almost 1 m/s flapping at around 5 Hz → Flies at around 6 m/s at a similar frequency, close to real diving birds → The water-to-air transition needs a pitch of around 70°. Shallower and the wingtips catch the surface, steeper and it falls back in My favourite finding is the one about feet. Puffins and ducks paddle at the surface to get airborne, so the team assumed a robot would need something equivalent. It doesn't. Wings and tail alone are enough. Funded in part by a Marie Skłodowska-Curie fellowship 🇵🇱 Read more here: ~~ ♻️ Join the weekly robotics newsletter, and never miss any news →

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166,000 neurons from a dead fruit fly now pilot a robot that drives and flies. It's the wildest piece of engineering on the internet right now, and the pilot has been dead the whole time. The robot rolls across a bedroom floor like a toy until the wheels stop being wheels: 4 propellers inside the rims spin up, and it lifts off, hangs at desk height, turns and lands. The body came out of a cardboard box of drone parts, and the brain it copies is smaller than a poppy seed and was never designed by a human. Janelia and Google spent years turning 1 male fruit fly into a spreadsheet, with every neuron and up to 125M synapses labeled, and on September 3 they posted it free for anyone to download. To build it, the fly was cut into thousands of layers and traced cell by cell under an electron microscope. Camera frames get turned into what a fly's eyes would see. The spikes run through the real wiring, where each neuron is 1 equation that rests at -52 mV and fires at -45. When something rushes at the lens, LPLC2 and LC4 light up, the same cells a fly uses to dodge your swatter, while DNg02 at the far end sets climb and turn. Inside the brain there's no flight code, no PID loop and no line that says "avoid the bed." Tesla's self-driving learned from billions of miles of driving, and this pilot learned from 400 million years of flies that didn't get swatted. A real fly walks on 6 legs and flies on 2 wings, and this one got 4 wheels and 4 propellers. The fly is dead, the brain is a file, and the file just took off.

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