XCSoar wind calculation

On Sun, 27 Sep 2009 14:52:10 +0000, PCool wrote:

Hi Paolo,

There were no changes for wind calculations in the code, and
normally we found the wind calculation in xcsoar to be very accurate
while thermalling...but only if we have a good and correct position
reporting from gps.

Thanks for confirmation that there are no forks in the wind calculation
code.

I wouldn't expect wind calculations in cruise to be as good as my C4
since it has TAS to work with (pitot+static and an internal altimeter,
hence TAS), but I was somewhat disturbed by the 90 degree wind direction
switching and the accompanying 50% variation in reported wind speed.

Otherwise, check your gps antenna if you are not using a 31X.

It seems OK - I've never had GPS drop-outs in flight though most (all?)
XCSoar log files have at least one irregular log interval reported by
EWView when I'm reviewing the flight.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

On Sun, 27 Sep 2009 22:16:51 +0000, Martin Gregorie wrote:

Following myself up: it turns out I'd left wind calculations configured
as 'Both' in a PNA, which lacks ASI connections or a compass. Dave Salmon
gave me the pointer to figuring this out. I've now changed the wind
calculation setting to 'circling' but have yet to fly with the new
configuration. I was surprised (but probably should not have been) that
the PNA default is 'Both'.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |