Curt wrote > Vivian Meazza wrote: > > 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. > > > > As has always been the case, if the current instrumentation is not > sufficient for your needs, you can always create a new instrument. > > /orientation/heading-magnetic-deg closely approximates an advanced > inertial system you might find on an advanced modern aircraft. > Reliable, trust worthy, dead on. You can also get true heading if you > prefer that. If you need something that is tied to the electrical > system, something that has various failure modes, something that models > sensor error, or if you just don't like > /orientation/heading-magnetic-deg for any other reason, then you'll need > to consider modeling a new heading approximation system in nasal, or > create a new instrument in C++ . There are some acronyms for these > sorts of things, AHRS, IMU, INS. Your jet probably has some sort of > ring laser based gyro system in real life? I don't know how deep you > want to get into modeling this system. My goal is to stock the kitchen > so all you cooks can create your culinary masterpieces. But if you want > some new vegetable, you might need to plant it yourself. >
As I wrote in my original posting - that's already done - I've done a fluxgate compass suitable for use at least up to the '70s. I'll submit that for inclusion in CVS shortly. An even more modern instrument is trivial, but I haven't done one yet. I also have a patch prepared which prevents xmlauto.cxx from generating spurious instruments, and which uses whichever Heading Indicator that is present. That's probably a 'fancy waistcoat', and I'm still pondering if it's worth submitting. Vivian _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
