Hi all, isn't it easier to implement (or merge) so called "TrueWind Calculation" from LK8000? If I understand the discussion correctly, TrueWind is doing pretty much the same, what is Tibor suggesting...
For those who do not know this feature, more information could be found in the LK8000's manual (http://www.bware.it/LK8000/LK8000_MANUAL_122.pdf), page 98, chapter "TrueWind Calculation v1". Tibor, please have a look at the LK8000 manual and compare it to your ideas. Is it "the same"? Or what's the difference? If it differs, which method would be better and why? Regards, Roman. On Mon, 23 May 2011 15:27:41 +0200, Tibor Arpas <ti...@bidforfix.com> wrote: > Just to clarify after John's question. > > The pilot needs to do zig zag for the zig zag calculation to work. And to do > zig zag flight path you inevitably have to make a turn. > > I'm still working with the assumption that there is no airspeed sensor, or > vario with airspeed data output in the glider. > > But the pilot flies constant, known airspeed for extended periods of time so > the airspeed sensor would indicate the same known value for these extended > periods of time. > Except of course for the situations when the pilot is not maintaining the > speed. > - circling > - change of decision and a scrappy turn into a new direction > - other distractions > > So ideally, the known speed is maintained most of the time and only > interrupted by some maneuvers which are detectable from the GPS track (with > a little help of some user interaction). > > This style of flying and little user interaction should give XCSoar enough > data to get wind calculation as good as LX 7000 or similar. > > Tibor > > > On Mon, May 23, 2011 at 13:16, John Wharington <jwharing...@gmail.com>wrote: > >> Hi Tibor, >> >> Maybe you misunderstand, you don't need constant airspeed for the zigzag >> wind algorithm to work, >> assuming you have a vario that outputs airspeed to XCSoar. >> >> >> On Mon, May 23, 2011 at 9:15 PM, Tibor Arpas <ti...@bidforfix.com> wrote: >> >>> Hmm, no idea, I look outside, not into instruments. when searching for >>> lift or making ad hoc decisions during glide I wouldnt like to concentrate >>> on IAS or some steady turns. Maybe it would be most beneficial on final >>> glide... >>> On May 23, 2011 12:07 PM, "John Wharington" <jwharing...@gmail.com> >>> wrote: >>> > You also need to be turning for zigzag wind to work; i wonder how >>> accurately >>> > you can fly to a given true airspeed while turning? >>> > >>> > On Mon, May 23, 2011 at 4:03 PM, Tibor Arpas <ti...@bidforfix.com> >>> wrote: >>> > >>> >> Hi everybody, >>> >> >>> >> I just recently learned strong arguments for a very steady >>> inter-thermal >>> >> cruising speeds (ignoring the McReady speed to fly): >>> >> http://www.betsybyars.com/guy/soaring_symposia/72price.html >>> >> >>> >> Sure, you should consult your gliders polar and the estimated climb in >>> >> front of you. >>> >> But until you hit something clearly worth circling in, you can maintain >>> >> steady speed. >>> >> >>> >> I flew this way during my last competition and it really feels better. >>> And >>> >> I think it also makes the airspeed sensor input unnecessary. >>> >> For a given day I might decide I'll do 150 km/h glides. >>> >> >>> >> Feature request: >>> >> I would like to set-up my typical gliding (air) speed in the "fligh >>> >> set-up". Now whenever XCSoar would detect a steady (GPS) speed for 20+ >>> >> seconds it would beep and I would be able to confirm with gesture that >>> I was >>> >> flying my typical airspeed during those 20 seconds. >>> >> >>> >> This way, I imagine, we would have more reliable wind computations even >>> for >>> >> those frequent cases when the wind changes and you don't circle. >>> >> >>> >> Tibor >>> >> >>> >> >>> >> >>> ------------------------------------------------------------------------------ >>> >> What Every C/C++ and Fortran developer Should Know! >>> >> Read this article and learn how Intel has extended the reach of its >>> >> next-generation tools to help Windows* and Linux* C/C++ and Fortran >>> >> developers boost performance applications - including clusters. >>> >> http://p.sf.net/sfu/intel-dev2devmay >>> >> _______________________________________________ >>> >> Xcsoar-user mailing list >>> >> Xcsoar-user@lists.sourceforge.net >>> >> https://lists.sourceforge.net/lists/listinfo/xcsoar-user >>> >> >>> >> >>> >> >> ------------------------------------------------------------------------------ What Every C/C++ and Fortran developer Should Know! Read this article and learn how Intel has extended the reach of its next-generation tools to help Windows* and Linux* C/C++ and Fortran developers boost performance applications - including clusters. http://p.sf.net/sfu/intel-dev2devmay _______________________________________________ Xcsoar-user mailing list Xcsoar-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xcsoar-user
