Next time you’re looking for screen-free hobbies or entertainment, pick up a popular pastime of yesteryear and build a model airplane. Not only do they keep your eyes and hands busy, but you ...

138 g airplane at 10.2 m/s is 7.2 J imparted to the load. His current numbers don’t add up (claims 90 amps at 48 volts, but measures 2 ohms in the maybe different coil).