Hand-built remote-controlled aircraft — brushless motor, ESC, servos, and a lot of foam.
Overview
Half the fun of an RC plane project is that you have to care about the airframe almost as much as the electronics. Weight, balance, control linkages — all the things you can ignore on a bench robot suddenly matter.
Mine has a brushless motor, ESC, three servos for the control surfaces, a standard RC receiver and a LiPo battery. The build itself was a lot of patient cutting and gluing.