The smaller brothers of the radiocontrolled trainer models. At first glance, and seen from far away theres no distinguishing, but they are made from Elapor, a lightweight material. Come out and fly with one of these gems and bring a small tube of glue, and you are prepared in case of a bad landing.
Scale models and replicas of mythical aircraft models, that are able to transmit the sensations of actually flying a plane with these characteristics.
Free flight (F/F): model aircrafts fly without external control from the ground. This type of model pre-dates manned flight.