However once the Angle of Attack moves beyond the plot, the aircraft will lose the ability to generate Lift and the aircraft will stall. At any Angle of Attack for which there is a Lift Coefficient, the aircraft can generate a Lift force. Regardless of the experiments designed to determine the specifics of the Lift Coefficient, a typical profile can be seen in Figure 2.2. Most airplanes need to be tested in a wind tunnel, on the computer with CFD, and/or real life in order to accurately develop an experimental model for the Lift Coefficient at various angles of attack.
You can read an ex celent summary of the simplest airfoil of them all, a "Flat Plate", from CalTech here. The exact function to calculate the Lift Coefficient is virtually non-existent for real airplanes and all but the most simplistic models. The Lift Coefficient is a function of Angle of Attack (a s you will see in later sections, this parameter is vital for Lift and Drag calculations ), and not actually a constant like the name "coefficient" might imply. Research in YSFHQ forum topics and community knowledg e ( Many thanks to Neocon, Midnight Rambler and Waspe414 for sharing their knowledge ) showed that while there are some generalities about the effect certain parameters have on aircraft behavior ( s uch as reducing landing distance for improved brake performance ), little was quantitatively known and the effect of many DAT parameters were less well known. The complication of countless trial and error DAT file edits and test flights drove home the point that there had to be a better way of developing a DAT file. The combination of the two, but more so the latter drove the result that I was looking for in the aircraft. In may ways this project highlighted not only the subtleties that can enhance the visual model, but also the immense improvement of tweaking the DAT file parameters until the desired behavior is obtained.
Beyond these simple concerns I did not pay much attention to them until I worked on the F-35 project. Historically I treated DAT files as a secondary part of the addon creation process, something that is only done to ensure weapons are located correctly, fuel burn rates are appropriate and angle of attack inputs will not automatically stall the aircraft.
But underneath the vertices and animations, the DAT files control everything about how an aircraft or ground object will behave. Creating models for YSFlight has been an enjoyable and rewarding experience for myself and many other members of the YSFlight community.
0 kommentar(er)
