The model plane world also includes devotees of control-line flying and free flight.

Control-line models are flown counterclockwise at the end of wires 42-70 feet long, with the pilot pivoting in a circle, controlling the plane by mechanical or electrical impulses to the plane's ailerons, elevators and wing flaps.

Competition under nationally adopted rules is in five categories of speed planes based on engine size. National records run from 120 to 200 m.p.h. There is a separate speed event for jet powered models.

In control-line stunt competition, the pilot performs precisely controlled flight maneuvers including inside loops, outside square and triangular loops, horizontal eights, four-leaf clovers and overhead figure eights.

Perhaps the most exciting control-line event is combat. Five-foot crepe paper streamers are tied to planes and two contestants are given five minutes to go at one another. The pilot most successful in cutting the opposition's streamer wins.

Midair collisions are inevitable, so combat flyers always come equipped with spare parts and planes.

There is even a control-line endurance event: how long can you stay in a 10-foot circle flying a control-line plane. The current national record is 5 hours 48 minutes.

Free flight aeromodeling competition tests durability. The successful flyer must be able to consistently record "max" flights (3-5 minutes, depending on the event) over the course of a competition day.

Categories include prop planes powered by various sized gasoline engines, rocket powered planes, hand-launched gliders, rubber band powered prop planes and towline gliders. Towline (or Nordic gliders) are launched kite fashion, only unlike kites they are released from their 164-foot launching cable for the actual timing of the flight.