dave perry wrote: > Laurence Vanek wrote: > >> For my money, the Seneca is one of the best done aircraft in FG. Have >> been flying it a good deal of late. >> >> >> > Agreed! > > <snip> > >> [2] On localizer during an ILS approach the A/P seems unstable >> (increasing roll oscillations) when within ~1 mile of approach end of >> runway. Perhaps this requires tweak of A/P controller constants. On a >> CAT II or III approach one would still not be able to see the runway at >> that distance. I usually disable the A/P at DH point. >> >> > I have commented before about the difference between yasim and jsbsim > when it comes to two autopilot issues. > 1. jsbsim becomes almost uncontrolable with turbulence. Even at 0.1 or > certainly at 0.2 turbulence, the c172p will not complete an approach > with the kap140. So, make sure you have turbulence at 0. > > I just confirmed that with turbulence zero, there are no such oscillations with the cvs SenecaII. You cannot count on using fgrun to get the turbulence set to zero. Use the weather menu in fgfs.
I flew the rw29R ILS into Jeffco (KBJC) with the SenecaII Altimatic IIIc autopilot all the way to the runway slowly pulling back the power so the auto trim did the flare out (sort of anyway). Touch down was on the center stripe! But with the no turbulence, you could see the ball move off-center every time the autopilot applied aileron to roll the AC. This off-center is WAY more than one would see in the real SenecaII. Jsbsim has a very noticeable exaggerated adverse aileron yaw issue. -Dave Perry ------------------------------------------------------------------------- SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 _______________________________________________ Flightgear-users mailing list Flightgear-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-users
