We liked the test rig he has for testing the thrust of a propeller. It allowed him to understand that his quadcopter design wasn’t feasible with the props he had on hand. His schlieren ...

v=TjXvzMdf8Nk&w=470] It was bound to happen sooner or later, but that doesn’t diminish the awesomeness of [Matthew]’s Raspberry Pi-powered quadcopter ... a few flight test videos over ...