Pencil-Copter

thingiverse

Turn any ordinary pencil into a whirring helicopter! Simply spin it in your hands and take off!\r\nAt last, a use for all those old, eraser-less pencils that were just taking up space.\r\nThis is seriously fun to play with - I'm telling you, it's a blast.\r\n\r\nYou may need to apply some glue after the pencil gets worn out from all the spinning.\r\nUse caution and common sense when playing with this propeller - the blades can be sharp and hurt if they hit you.\r\n\r\nI carefully designed this propeller with extra weight at the blade tips, increasing its moment of inertia. This way, it won't slow down as quickly, thanks to its built-in kinetic energy.