Flight Model
X-Plane differentiates itself by implementing an aerodynamic model known as blade element theory. Traditionally, flight simulators try to emulate the real-world performance of an aircraft by using lookup tables to find known aerodynamic forces such as lift or drag, which vary with flight condition. These simulators do a good job of simulating the flight characteristics of the aircraft they were designed to simulate (those with known aerodynamic data), but are not useful in design work, and do not predict the performance of aircraft when the actual figures are not available.
Blade-element theory is one method of improving on this. It is a way of modeling the forces and moments on an aircraft by individually evaluating the parts that constitute it. Blade-element theory and other computational aerodynamic models can be used to compute aerodynamic forces in real time or to pre-compute aerodynamic forces of a new design for later use in a traditional lookup table type of simulator.
With Blade-element theory, a wing, for example, may be made up of many sections (1 to 4 is typical), and each section is further divided into as many as 10 separate sections, then the lift and drag of each section is calculated, and the resulting effect is applied to the whole aircraft. When this process is applied to each component, the simulated aircraft will fly virtually like its real counterpart does. This approach allows users to design aircraft on their computer quickly and easily, as the simulator engine will show immediately how an aircraft with a given design might perform in the real world.
X-Plane can model fairly complex aircraft designs, including helicopters, rockets, rotor craft and tilt-rotor craft. Famous real-world aircraft modeled in X-Plane include the Zeppelin Hindenburg, V-22 Osprey, the Harrier Jump Jet, the NASA Space Shuttle, and Scaled Composites SpaceShipOne.
Blade element theory has shortcomings, as it can sometimes be difficult to design an aircraft that performs precisely as would real-world aircraft. However, as the flight model is refined, the simulator can better resemble real-world performance, and aircraft quirks and design flaws.
Read more about this topic: X-Plane (simulator)
Famous quotes containing the words flight and/or model:
“When we are high and airy hundreds say
That if we hold that flight they’ll leave the place,
While those same hundreds mock another day
Because we have made our art of common things ...”
—William Butler Yeats (1865–1939)
“If the man who paints only the tree, or flower, or other surface he sees before him were an artist, the king of artists would be the photographer. It is for the artist to do something beyond this: in portrait painting to put on canvas something more than the face the model wears for that one day; to paint the man, in short, as well as his features.”
—James Mcneill Whistler (1834–1903)