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YASim is one of three flight dynamics | '''YASim''' is one of three [[flight dynamics model]]s commonly used by [[FlightGear]]. | ||
The flight dynamics model (FDM) determines how the aircraft moves and flies. | The flight dynamics model (FDM) determines how the [[aircraft]] moves and flies. | ||
Andy Neely wrote in his [http://ltts.crlt.indiana.edu/grn/flightgear/yasim_1.html introduction to YASim]: | Andy Neely wrote in his [http://ltts.crlt.indiana.edu/grn/flightgear/yasim_1.html introduction to YASim]: | ||
:The FDM is the mathematical model that controls the physics of flight within the simulator. The physical 3D aircraft model has nothing to do with flight dynamics-- in essence it's just a picture to look at. It's the FDM that dictates how the model flies. | :''The FDM is the mathematical model that controls the physics of flight within the simulator. The physical 3D aircraft model has nothing to do with flight dynamics-- in essence it's just a picture to look at. It's the FDM that dictates how the model flies.'' | ||
:Why YASim? YASim uses the geometry of the aircraft to generate the base flight characteristics. While this suggests a 'realistic' or out-of-the-box approach, it is a only rough approximation that will require much tweaking before you get a result that approaches realism. Contrast this with JSBSim which relies on pre-generated tabular data to build up the flight model. If you have solid flight data for your aircraft such as wind-tunnel data or you are looking to eventually generate a hyper-realistic simulation, JSBSim is probably a better approach. If you lack such data but know the geometry of the aircraft and have access to the same flight characteristics and limits as a real pilot would, then YASim can provide a solution that is more than sufficient for most simulation needs. | :''Why YASim? YASim uses the geometry of the aircraft to generate the base flight characteristics. While this suggests a 'realistic' or out-of-the-box approach, it is a only rough approximation that will require much tweaking before you get a result that approaches realism. Contrast this with JSBSim which relies on pre-generated tabular data to build up the flight model. If you have solid flight data for your aircraft such as wind-tunnel data or you are looking to eventually generate a hyper-realistic simulation, JSBSim is probably a better approach. If you lack such data but know the geometry of the aircraft and have access to the same flight characteristics and limits as a real pilot would, then YASim can provide a solution that is more than sufficient for most simulation needs.'' | ||
===Coordinate system notes=== | ===Coordinate system notes=== |