Hi Ian, I entered ticket 3062 some time ago, and I have not seen anything happening since.
I still see bogus wind speeds from time to time. But that only happens rarely at the beginning of the flight. After ~1/4 hour into the flight it converges to reasonable wind readings. Sometimes I believe it gets confused when the tow plane blows at the PITOT tube in a strange way. But I have not discovered any systematic when this happens. It's certainly not nice, but it doesn't annoy me anymore. However, I am alarmed when I read apf's recent update on ticket 3062 http://bugs.xcsoar.org/ticket/3062#comment:3 . He writes: if multiple devices provide the data the time of the data acquisition has to match, e.g. if either GPS or TAS is somewhat delayed compared to each other expect rubbish calculations. Also he writes: if either GPS or TAS is somewhat delayed compared to each other expect rubbish calculations. Several NMEA sources are probably very common. I have a FLARM and a CAI302, using FLARM traffic from one source and TAS from the other. I doubt that the 2 sources agree on location, pressure, maybe not even on time. Expect different processing delays in different devices. If that confuses XCSoar, then this would be a serious problem. XCSoar has to deal with this situation in a predictable and systematic way. Who can shed some light to this? Ronald Am 20.11.2014 18:29, schrieb Ian: > Hi All > > I have experienced XCSoar report grossly inaccurate wind values. Wind > speeds of > 100km/h, coming from the completely the wrong direction. > This happens with wind settings on "auto, both". I have seen it quite > often, but not on every flight. If I play with settings during flight, I > can sometimes fix the issue. Setting wind to "auto, circling" for a > while seems to help. If I can "tame" this issue, the wind calcs are fast > and accurate for the rest of the flight. > > This is a photo of a NMEA log file replay on my Dell Streak which shows > the problem: > > http://users.zsd.co.za/~ian2/xcsoar-bug/2014-11-20%2009.24.36.jpg > > The wind speed is indicated > 100 km/h, it should read about 25km/h. > This is an hour and a half into the replay. I also setup info boxes to > show true airspeed and ground speed. > > I searched the bug lists and I found this ticket which appears to > describe my problem: > > http://bugs.xcsoar.org/ticket/3062 > > I have added comments to that ticket with a link to a NMEA log file and > that photo. > > Unfortunately nobody has claimed ownership of this bug and there have > been no updates for over a year. So I posted this here least somebody > sees this and is inspired to provide man hours to fix the problem. > > I do a lot of ridge and wave flying where circling wind calcs do not > work and I loath playing with PDA settings in flight. (Definitely not a > good idea when ridge soaring!). So I am keen to help get this bug fixed. > > Thanks in anticipation! > > > Ian > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > with Interactivity, Sharing, Native Excel Exports, App Integration & more > Get technology previously reserved for billion-dollar corporations, FREE > http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk > _______________________________________________ > Xcsoar-user mailing list > Xcsoar-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xcsoar-user > > ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk _______________________________________________ Xcsoar-user mailing list Xcsoar-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xcsoar-user
