I doubt very much that users want to fly a predefined accurate set of paths
just to determine wind while they are on a cross-country flight.
On Tue, May 24, 2011 at 12:17 AM, Roman Stoklasa <rst...@gmail.com> wrote:
> 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
> >>> >>
> >>> >>
> >>> >>
> >>>
> ------------------------------------------------------------------------------
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>
>
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