Curt wrote > I think the simple solution here is to modify the autopilot config so > the input is not from a vacuum driven heading indicator since you don't > have one, but from a different property that you do have.
There is one - nearly - as I said orientation/heading-magnetic-deg. But it's not derived from an instrument, and therefore has no supply, neither can it fail, not does it have any error. Further, use of such a property will not stop, AFAIKS, the generation of spurious and unnecessary instruments, caused by incorrect initiation, and a hack to get around this. This looks unprofessional. > The autopilot is designed to be very configurable in this respect and > even though it can be complex, you can create a custom config for each > aircraft that matches it's real world capabilities and design quite > closely. So it is. Except the existing Heading Indicator is quite inappropriate for even halfway recent military or civil aircraft. > > Vivian Meazza wrote: > > In the course of developing the KC135, I noticed that parts of the > autopilot > > function do not work in that model, copied from the B737 - the bits > > described as vor/loc and app. Investigation showed that the cause was > simple > > - in JSBSim a jet ac does not have vacuum system. No vacuum - no Heading > > Indicator - no Heading Indicator - no vor/loc etc. So quick as a flash > I > > rustled up an electrically driven one. Simple solution? Wrong: when I > tried > > to implement a dedicated instrument.xml configuration for the KC135, > using > > the new Heading Indicator, the old one was still present (and still > > inoperative). This is caused by xmlauto.cxx initiating before > > instrumentmgr.xml, and creating the unnecessary nodes which it needs. So > I > > changed the initiation order. But by this time I realised that the > simple > > Heading Indicator we have is not what would be fitted to a KC135, or > indeed > > any jet ac since the '50s onward. We need what I would call a flux gate > > compass (you might know a more modern term). This is more or less just > the > > property orientation/heading-magnetic-deg, but I thought that, for > > completeness a proper flux gate instrument electrically driven etc, > would be > > nice. So I coded up one, and amended xmlauto.cxx so that it uses > whichever > > sort is configured and does not generate spurious ones. > > > > Now, I might have got hold of the wrong end of the stick here, and > someone > > may well know better. I intend to arrange the upload of these pretty > trivial > > changes at the weekend unless otherwise directed, or as I would have > said in > > a former existence UNODIR. > > > > Regards > > > > Vivian > > > > > > > > _______________________________________________ > > Flightgear-devel mailing list > > Flightgear-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/flightgear-devel > > > > > -- > Curtis Olson http://www.flightgear.org/~curt > HumanFIRST Program http://www.humanfirst.umn.edu/ > FlightGear Project http://www.flightgear.org > Unique text: 2f585eeea02e2c79d7b1d8c4963bae2d > > > > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
