University of California San Diego engineer Timothy O’Connor led a team that developed a smart glove that turns the American Sign Language alphabet into text. The project used inexpensive off-the-shelf products totalling about $100. Read the rest
This handheld, rocket-powered robot can leap about 30 meters and make a targeted landing. Once it's on the ground, it can then spin up and then abruptly brake its flywheel to jump forward or backward for a bit more mobility. Developed by the Japan Aerospace Exploration Agency, the rocketeer robot could someday liftoff from a planetary or lunar lander or rover. The 450-gram prototype uses an Estes C11 rocket engine like those used in model rocketry! From IEEE Spectrum:
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The robot is mounted on an angled rail and when it’s time to fly, it spins up its reaction wheel and sets off the primary rocket. The rocket launches the robot on a parabolic trajectory with a maximum range, in Earth gravity, of up to about 30 meters, which would increase to about 200 meters under lunar gravity. The reaction wheel minimizes the effect of the robot body tumbling during flight, keeping the robot going on a straight line: We held this little thing with the gyro wheel turned on during an interactive session at (the International Conference on Robotics and Automation), and it was impressively powerful: There was a significant amount of resistance to any kind of sideways rotation. Since solid-fuel rocket engines can’t be throttled, the opposing thrust motors are fired when necessary to alter the robot’s trajectory for a targeted landing. It’s a fairly effective technique, and in their tests the standard deviation of a series of launches decreased from 1.2 to 0.29 meters, or four times more precise than without the opposing rockets.
Why do shoelaces suddenly become untied? Mechanical engineer Oliver O'Reilly and his UC Berkeley colleagues have just published a scientific paper exploring this mystery of the ages. According to O'Reilly, understanding how simple knots work, and then don't, could lead to better knots for surgery, protect undersea optical networking cables from breaking, and enable more realistic animations of hair in computer graphics. From Nature:
The scientists expected that the knots would come undone slowly. But their slow-motion footage — focused on the shoelaces of a runner on a treadmill — showed that the knots rapidly failed within one or two strides. To figure out why, O’Reilly and his colleagues used an accelerometer on the tongue of a shoe to measure the forces acting on a knot. They found that when walking, the combined impact and acceleration on a shoelace totals a whopping 7 gs — about as much as an Apollo spacecraft on reentry to Earth’s atmosphere.
Further experiments demonstrated that simply stomping up and down wasn’t enough for a knot to fail; neither was swinging it back and forth. It took the interlaced effects of the two forces to undo the knot: the repeated impacts loosened it while the changes of direction pulled on the laces.
Heavy rains on the west coast have caused rockslides like this behemoth blocking an Oregon highway south of Eugene. Oregon DOT set up a camera as they blasted it into manageable chunks.
Spoiler: it went way better than Oregon's exploding whale...
PS: here's the "blowed up real good" reference if you're scratching your head.
Behold, the Blue Marlin, a "semi-submersible heavy lift ship" that is capable of hoisting and transplanting other, full-sized ships (that is ships as big or bigger than a US Destroyer-class vessel) all around the oceans. Read the rest
When I saw the state of the Hyundai these guys found in the bush, I thought the clip was going to be a joke. Then they fix it with their axes. Mad props to Aboriginal Australian mechanics and Korean engineers. Read the rest