Infinite glider
An infinite gilder, often abbreviated as infiniglider, is a glider which exploits(To be clear on users calling this a glitch, it's not. It's the game that allows you to move control surfaces freely without requiring anything else which makes this an exploit and not a glitch) KSP's aerodynamics and allows a craft to accelerate indefinitely without an engine. Most infinite glider designs use many control surfaces which are flapped very rapidly. It is possible to use infinite gliders on every celestial body with an atmosphere.
Mechanics
Infinite gliders work by exploiting the aerodynamics system and the way in which control surfaces interact with the atmosphere. When a light craft is equipped with several, rapidly moving them back and forth causes the airplane to quickly wobble in alternating directions and accelerate, possibly to speeds in excess of several kilometers a second. However, infinite gliders tend to experience high g-forces due to the erratic and rapidly changing nature of their acceleration, and can disintegrate if flown too quickly.(Again this article mentions that infinite gliders experience physics bugs because of high speeds, which isn't the real cause of disintegration. Disintegration happens because the parts where not meant to be used in such a strong force, also it's recommended to use struts to make high speed gliders stable and don't use full time warp on infinite gliders that rely on jerking or twitchy motions to fly.)
Infinite gliders resemble real-life ornithopters.
