From: cory barton <cory00@gm...>  20080626 20:23:34

I don't know about YASim, but I am in the process of digging through JSBSim in an effort to extract the mathematical model. To me it does appear the JSBSim is a total forces and moments theory model. You may want to see the following bits of the JSBSim documentation: FGForce class: http://jsbsim.sourceforge.net/JSBSim/classJSBSim_1_1FGForce.html FGAircraft class: http://jsbsim.sourceforge.net/JSBSim/classJSBSim_1_1FGAircraft.html FGPropgate class: http://jsbsim.sourceforge.net/JSBSim/classJSBSim_1_1FGPropagate.html These papers are also referenced by the JSBSim docs, and may help you(you can get them all for free online): Cooke, Zyda, Pratt, and McGhee, "NPSNET: Flight Simulation Dynamic Modeling Using Quaternions", Presence, Vol. 1, No. 4, pp. 404420 Naval Postgraduate School, January 1994 D. M. Henderson, "Euler Angles, Quaternions, and Transformation Matrices", JSC 12960, July 1977 Richard E. McFarland, "A Standard Kinematic Model for Flight Simulation at NASAAmes", NASA CR2497, January 1975 Sophie, hopefully this will help you, also If you have any insights for me to help me extract the mathematical model from the code, then let me know. Cory On Thu, Jun 26, 2008 at 3:22 PM, <sbwong@...> wrote: > Hi, > > Thank you for answering my last question and it was really helpful. > I have another question on the Flight Dynamic Models YASim. > Can I say YASim is a Blade Element Theory Model? > If not, what kind of model is that. For example, a total forces and moments theory model or > kinematic model. > BTW, from the documentation of JSBsim, I would say that is also a total forces and moments > theory model, right? > > Thanks again for all your help. > > Sophia Wong > > > >  > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://sourceforge.net/services/buy/index.php > _______________________________________________ > Flightgeardevel mailing list > Flightgeardevel@... > https://lists.sourceforge.net/lists/listinfo/flightgeardevel > 