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 Wrong TAS for XCVario Driver
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tvebi
Pulcino

Germany
28 Posts

Posted - 30/05/2024 :  18:26:35  Show Profile  Reply with Quote
Hallo,

try to use XCVario driver on my Kobo LK8000 7.4.15.
TAS airspeed indication (km/h) is wrong, IAS airspeed indication is correct.
I logged some records XCVario sends:

Best Regards.

$PXCV,0.0,1.00,0,,1,22.3,1013.0,971.5,426.0,,,,,*27
$PXCV,-0.0,1.00,0,,1,22.3,1013.0,971.7,446.8,,,,,*06
$PXCV,-0.0,1.00,0,,1,22.3,1013.0,971.7,470.0,,,,,*0B
$PXCV,0.0,1.00,0,,1,22.3,1013.0,971.7,494.4,,,,,*28
$PXCV,0.0,1.00,0,,1,22.3,1013.0,971.7,507.8,,,,,*2F
$PXCV,0.1,1.00,0,,0,22.3,1013.0,971.7,518.8,,,,,*21
$PXCV,0.1,1.00,0,,0,22.3,1013.0,971.7,499.3,,,,,*22
$PXCV,0.1,1.00,0,,0,22.3,1013.0,971.7,522.5,,,,,*25
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,544.4,,,,,*25
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.6,555.4,,,,,*24
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,570.1,,,,,*27
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.6,582.3,,,,,*29
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,587.2,,,,,*2C
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,596.9,,,,,*27
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,596.9,,,,,*27
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,620.1,,,,,*21
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,631.1,,,,,*21
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.6,640.9,,,,,*2E
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,651.9,,,,,*2F
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,661.6,,,,,*23

tvebi
Pulcino

Germany
28 Posts

Posted - 31/05/2024 :  15:16:25  Show Profile  Reply with Quote
Hallo,

I have done forther investigation on that and I find if static pressure is multiplied by 100.( may be it is used in Pa) the TAS values are as expected. So the code in devXCVario.cpp should be:

quote:

double dyn_press, static_press;
if (ReadChecked(params, static_press)
&& ReadChecked(params[9], dyn_press))
{
// Static && Dynamic pressure in hPa
pGPS->AirspeedAvailable = true;
pGPS->IndicatedAirspeed = sqrt(163.2653061 * dyn_press / 100.);
double qne_alt = StaticPressureToQNEAltitude(static_press*100.);
pGPS->TrueAirspeed = TrueAirSpeed(pGPS->IndicatedAirspeed, qne_alt);
}



quote:
Originally posted by tvebi

Hallo,

try to use XCVario driver on my Kobo LK8000 7.4.15.
TAS airspeed indication (km/h) is wrong, IAS airspeed indication is correct.
I logged some records XCVario sends:

Best Regards.

$PXCV,0.0,1.00,0,,1,22.3,1013.0,971.5,426.0,,,,,*27
$PXCV,-0.0,1.00,0,,1,22.3,1013.0,971.7,446.8,,,,,*06
$PXCV,-0.0,1.00,0,,1,22.3,1013.0,971.7,470.0,,,,,*0B
$PXCV,0.0,1.00,0,,1,22.3,1013.0,971.7,494.4,,,,,*28
$PXCV,0.0,1.00,0,,1,22.3,1013.0,971.7,507.8,,,,,*2F
$PXCV,0.1,1.00,0,,0,22.3,1013.0,971.7,518.8,,,,,*21
$PXCV,0.1,1.00,0,,0,22.3,1013.0,971.7,499.3,,,,,*22
$PXCV,0.1,1.00,0,,0,22.3,1013.0,971.7,522.5,,,,,*25
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,544.4,,,,,*25
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.6,555.4,,,,,*24
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,570.1,,,,,*27
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.6,582.3,,,,,*29
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,587.2,,,,,*2C
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,596.9,,,,,*27
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,596.9,,,,,*27
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,620.1,,,,,*21
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,631.1,,,,,*21
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.6,640.9,,,,,*2E
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,651.9,,,,,*2F
$PXCV,0.0,1.00,0,,0,22.3,1013.0,971.7,661.6,,,,,*23




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brunotl
Pterodattilo

France
1108 Posts

Posted - 04/06/2024 :  17:21:54  Show Profile  Reply with Quote
thanks for the feedback, will be fixed asap..
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