No description
bdcfe0c357
Changes: Fit the solver to the known stall speed instead of an abstract approach configuration. That is, specify stall AoA and speed as "approach" values. At approach weight (20% fuel) I can now just barely hold the aircraft in the air without losing it at 87 kias. Note that the IAS guage seems to have a slight calibration error, it was reading something that looked more like 95 knots; I got the real value out of the property browser. Change the sign of the incidence value for the wing. It specifies a rotation about the axis pointing out the left wing, so positive values are "nose down". Increase the "effectiveness" of the tail surfaces quite a bit. Smaller surfaces do actually need higher values. YASim scales surface force coefficients with their areas, which is correct within a single wing. But between wing-like devides, generated forces kinda/sorta scale linearly with their spans. This is particularly important for tail draggers, since YASim's lack of prop wash modelling needs to be offset by extra elevator authority. Add a camber value to the wing. Most wing airfoils are asymmetric, and produce non-zero lift at zero AoA. I picked 0.1 (10% of stall lift at zero alpha) as a reasonable guess. If someone has airfoil data for the Mustang we could look this up exactly. This was the biggest change, which allows the cruise AoA to be much lower than approach or stall. Reduced the compression value for the tail wheel to 20cm. These things are very stiff; they "compress" only as much as the tires do. Even 0.2 is too much motion, but the numerics tend to go wacky when you give them very high spring coefficients. This helped the ground handling a little bit. Removed the extra damping from the main gear. My impression of tail draggers is that they tend to have "squishy" main gear. Again, this (subjectively) seemed to improve ground handling to me. I also tried reducing the spring constants to 0.5, but that ended up being too squishy -- you could see the ship (stopped on the ground) bank to the left by 2-3° when you pushed the throttle forward. Ground handling is still pretty difficult; I get the best results by holding the tail down until 90 knots or so and then very gently lowering the stick. The aircraft bobs once or twice and then lifts off. I don't think this is proper procedure, though. Andy |
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| Aircraft | ||
| Aircraft-uiuc | ||
| Aircraft-yasim | ||
| Airports | ||
| Astro | ||
| ATC | ||
| Data/SkyClouds | ||
| Docs | ||
| Engine | ||
| Fonts | ||
| gui | ||
| Huds | ||
| Input/Joysticks | ||
| Lighting | ||
| Navaids | ||
| Protocol | ||
| Sounds | ||
| Textures | ||
| Timezone | ||
| Translations | ||
| Weather | ||
| .cvsignore | ||
| AtlasPalette | ||
| AUTHORS | ||
| ChangeLog | ||
| COPYING | ||
| joysticks.xml | ||
| keyboard.xml | ||
| large.sky | ||
| materials.dtd | ||
| materials.xml | ||
| menu.xml | ||
| mice.xml | ||
| NEWS | ||
| options.xml | ||
| preferences.xml | ||
| README | ||
| runfgfs.bat | ||
| Thanks | ||
| version | ||
Welcome to the FlightGear Flight Simulator project. =================================================== The primary web page for this project is: http://www.flightgear.org For basic installation instructions see the "INSTALL" file. Before you can run FlightGear you will also need to download and install the "base" package which is a collection of textures, sounds, sample scenery, and other data files need by the sim. For additional install help for specific platforms please browse the "docs-mini/" subdirectory. More complete documentation is available from our web page as a separate distribution. Please take a look at the "Thanks" file for a list of people who have contributed to this project. If you have contributed something but don't find your name in this file. Please send a polite reminder to curt@flightgear.org For a summary of changes/additions by version see the "NEWS" file. This project is GPL'd. For complete details on our licensing please see the "COPYING" file. For information on available mailing lists, mailing list archives, and other available source code and documenation, please visit our web site. FlightGear is a product of the collaboration of large international group of volunteers. FlightGear is a work in progress. FlightGear comes with no warrantee. We hope you enjoy FlightGear and/or find it of some value!