This tiny quadcopter, CrazyFlie is basically a PCB, four motors, and some micro sized propellers. The robot measures at just 10 cm per side and it weighs only 20 grams. The CrazyFlie has no metal structure, but instead it uses its PCB for the main structure that houses the battery, motors, and circuits. Even though its tiny, it has a charging port, radio, multi-axis accelerometer, a couple of gyroscopes, and a small LiPO battery. The overall flight time is around four and a half minutes long, but to me that would be loads of fun. You can see it in flight in the video below. Thanks for reading and feel free to comment below!