At 4/25/02, you wrote: >I have been seeing a strange difference between the view I get with the >same AC mode and the JSBSim and MagicCarpet FDMs. The pilot view is >correct with JSBSim, but under the magic carpet, the pilot is buried up to >their eyeballs in the tarmac. There are pictures that show both >situations, from the outside view. > >http://homepage.mac.com/eq_fidget/magic_ac.png > >is with the MagicCarpet FDM and > >http://homepage.mac.com/eq_fidget/JSBSim.png > >is with JSBSim > >Its been a problem for a while, it's just that I haven't been using >anything other than the MagicCarpet and thought it was a more general problem.
I speculate that the new problem running w/ the MagicCarpet FDM (buried aircraft) is related to the same problem running w/ the LaRCsim/UIUC FDM that I have reported. All the while, this has not been a problem running w/ JSBSim FDM. The problem started around the time that work on the viewer code began. Here's my Beech 99 buried: http://amber.aae.uiuc.edu/~m-selig/tmp/beech.gif With this aircraft I used Dz_cg = 2.5 ft. This is a LaRCsim variable which we can set from our code. When I set Dz_cg = 0 ft, then the aircraft is above the ground. I don't like this solution because it means that I cannot move the cg relative to the aero reference point anymore (unless I want to watch the aircraft takeoff from underground). It also required me to change some of my configuration files (most were using Dz_cg = 0 by default). I have not tried to dig deeper. But it must relate to Dz_cg and w/ it d_cg_rp_body_v (see flight.hxx and ls_generic.h). Getting closer to the problem might involved this part of code in flight.hxx // This is based heavily on LaRCsim/ls_generic.h class FGInterface : public FGSubsystem { .... Much has changed here since 0.7.8 I would not have to speculate if I knew what I need to know about c++ ... ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I wonder if you run JSBSim w/ Dz_cg not equal to zero, are the aircraft buried? Regards, Michael >Thanks, > >Jonathan Polley > > >_______________________________________________ >Flightgear-devel mailing list >[EMAIL PROTECTED] >http://mail.flightgear.org/mailman/listinfo/flightgear-devel ************************************************** Prof. Michael S. Selig Dept. of Aero/Astro Engineering University of Illinois at Urbana-Champaign 306 Talbot Laboratory 104 South Wright Street Urbana, IL 61801-2935 (217) 244-5757 (o), (509) 691-1373 (fax) mailto:[EMAIL PROTECTED] http://www.uiuc.edu/ph/www/m-selig http://www.uiuc.edu/ph/www/m-selig/faq.html (FAQ) ************************************************** _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
