Editing Model aircraft (section)

===Gliders===
[[File:KN Modelloldtimer Sindbad.JPG|thumb|model glider showing typical internal structure]]
[[Glider (aircraft)|Gliders]] do not have an attached [[aircraft engine|powerplant]]. Larger outdoor model gliders are usually [[radio-controlled glider]]s and hand-winched against the wind by a line attached to a hook under the fuselage with a ring, so that the line drops when the model is overhead. Other methods include catapult-launching, using an elastic [[bungee cord]]. The newer [[Discus Launch Glider|"discus" style]] of wingtip hand-launching has largely supplanted the earlier "javelin" type of launch. Also using ground-based power winches, hand-towing, and towing aloft using a second powered aircraft.

Gliders sustain flight through exploitation of the [[wind]] in the environment. A hill or slope often produces updrafts of air that sustain the flight of a glider. This is called [[slope soaring]], and  radio controlled gliders can remain airborne for as long as the updraft remains. Another means of attaining height in a glider is exploitation of [[thermal]]s, which are columns of warm rising air created by differences of temperature on the ground such as between an asphalt parking lot and a lake. Heated air rises, carrying the glider with it. As with a powered aircraft, [[lift (force)|lift]] is obtained by the action of the wings as the aircraft moves through the air, but in a glider, height is gained by flying through air that is rising faster than the aircraft is sinking.

[[Walkalong glider]]s are lightweight model airplanes flown in the [[ridge lift]] produced by the pilot following in close proximity. In other words, the glider is [[slope soaring]] in the updraft of the moving pilot (see also [[Controllable slope soaring]]).