Wikipedia
RealFlight is a radio-controlled airplane and helicopter simulation software series created by Knife Edge Software and published by Great Planes. The software allows for the flying of numerous aircraft with simulated physics so that the user can get an attempted real-life flying experience.
Included in the software are various flying sites (or airports) and aircraft models, almost all of which represent real-life models. The software also includes an airport editor and an aircraft editor to allow for the creation of new flying sites and aircraft. Within RealFlight, editing aircraft is limited to changing the physical and aerodynamic properties. In order to create new visual models, the use of a 3D modeling application such as Autodesk 3ds Max or Blender is required.
The software is released in "generations," with each new generation including major updates and new features. The most recent is RealFlight Generation 7.5, which included additions such as water and water physics, an improved user interface, more aircraft, more flying sites, and an improved "InterLink Elite" controller. RealFlight requires the connection of an InterLink controller, which is included with the software, in order to operate.