Ключевые слова: active, air, aircraft, airfield, altitude, antenna, battery, challenge, concentration, control, controlled, enjoy, flight, fly, fun, grass, guy, helicopter, high, hobby, hover, joy, leisure, lightweight, machine, male, man, model, operate, operated, outdoor, people, pilot, piloting, plastic, play, pleasure, power, propeller, radio, rc, recreation, remote, scalemodel, small, sport, stick, toy, transmission, transmitter chopper,