Editing Model aircraft (section)

====F2D – control line combat====
CLASS F2D -  Control Line Combat Model Aircraft - Two pilots compete, with four mechanics in the pit. The aircraft are light and stubby so as to maneuver quickly in the air. Each has a {{cvt|2.5|m|order=flip}} crepe paper streamer attached to the rear of the aircraft by a {{cvt|3|m}} string. Each pilot attacks only the other aircraft's streamer, to attempt to cut it with their propeller or wing. Each cut scores 100 points. Each second the model is in the air scores a point and the match runs for 4 minutes from the starter's signal. At the almost {{cvt|200|km/h|order=flip}} speeds of the aircraft, mistakes often lead to crash damage so two aircraft are permitted for each match. The mechanics are prepared for crashes and quickly start the second aircraft and transfer the streamer to the reserve model before launching. The action is so fast that an observer may miss the cuts of the streamers. A second loss eliminates a competitor, and the last pilot still flying wins.<ref>{{cite web |title=F2 - Control Line |url=https://www.fai.org/page/f2-control-line |publisher=FAI Aeromodelling Commission (CIAM)}}</ref>