Editing Model aircraft (section)

===Control===
Flying model aircraft are generally controlled through one of three methods
*[[Free flight (model aircraft)|Free flight]] (F/F) model aircraft are uncontrolled other than by control surfaces that must be preset before flight, and must have a high degree of natural stability. Most free flying models are either unpowered gliders or rubber powered. These pre-date manned flight.<ref>{{cite web |url=http://www.geocities.com/aerohydro/mfm/model.htm|archive-url=https://web.archive.org/web/20091028062404/http://www.geocities.com/aerohydro/mfm/model.htm|title=Model Flying Machines|archive-date=28 October 2009|work=geocities.com}}</ref>
*[[Control line]] (C/L) model aircraft use strings or wires to tether the model to a central pivot, either held by hand or to a [[round-the-pole flying|pole]]. The aircraft then flies in circles around that point, secured by one cable, while a second provides [[Aircraft principal axes|pitch]] control through a connection to the elevator. Some use a third cable to control a throttle. There are many competition categories. Speed flying is divided into classes based on engine displacement. Class 'D' 60 size speed planes can easily reach speeds well in excess of {{cvt|150|mph}}.
*[[Radio-controlled aircraft]] have a controller who operates a [[transmitter]] that sends signals to a [[receiver (radio)|receiver]] in the model to actuate servos that adjust the model's flight controls similarly to a full sized aircraft. Traditionally, the radio signal directly controlled [[Servo (radio control)|servos]], however, modern examples often use flight control computers to stabilize the model or even to fly it autonomously. This is particularly the case with [[quadcopter]]s. Rudimentary flight controllers were first introduced in model helicopters, with standalone electronic gyroscopes used stabilize the tail rotor control. Much like quadcopters, this has now extended to all flight controls.