X-Plane 6 is a flight simulator using the blade element theory. It provides
a real-time simulation of flight using actual weather info, aircraft systems
performance and failures, accurate topographical data and real world navaids
(over 25,600) and airports (over 21,000). The game is bundled with tools to
design and modify aircraft, navaids and scenery. Also, various aircraft models
have been included such as the Boeing 747, Piper Malibu, F-22 Raptor, Cessna
172, Bell 206, X-15, and Space Shuttle, to name a few.

This version differs from the previous in the following major areas:

* Minimum resolution increased to 1024×768.
* New scenery format with 5 times the number of elevation points.
* Auto-generated buildings.
* New aircraft format with new texture format and greatly increased flexibility in instruments. Vastly improved default instruments.
* Round world terrain model that eliminates the old distortions and errors.
* Major terrain upgrade: improved terrain accuracy for the US, land use data, all new terrain textures, roads, rivers, power lines, etc.
* Custom scenery folders.

The game uses the so-called blade element theory (19th century) to calculate
aircraft behaviour. In essence this theory regards each surface as an airfoil
and calculates the forces acting upon to derive its velocity. Hence the way
the aircraft handles and behaves is governed by its shape, weight, centre of
gravity (CG), drag and thrust. Other flight simulators have chosen to use
tables for aircraft performance. One benefit of that approach is that less
powerful computers can perform the simulation. By using different factors for
density, gravity, the game will allow for flights in a different atmosphere.
An included example is Mars.

Plug-ins enhance this simulator further by adding, for instance, real-time
online flying, flight planning and control. The game can output data which can
be fed to motion platforms, displays, navigation systems or home-built
cockpits. It can also receive data from external sources such as RC-flight
controls, Garmin GPS system, or your own flight model. Different angles of
view can be output to up to 5 individual monitors (or streamed over the
LAN/Internet).