Skymaster 9999 Posted January 21, 2022 Report Share Posted January 21, 2022 Hallo to all users and authors of this useful sw. I have a a plea to the authors - would you please consider extension of NMEA out senteces for $GPMWV / $GPMWD (wind info)? With the appearance of gliders in MSFS I would like to use XCSoar on my phone but because FSUIPC 7 sends only position and baro height, wind estimates are way off (in this case XCSoar calculates wind from circling only with very unprecise results). To be more precise, XCSoar require IAS/TAS info, send via customized NMEA sentences (LX / Borgelt etc extensions of NMEA protocols) to calculate wind or use wind info directly from external source. Thank you for your kind help and keep the good work. Link to comment Share on other sites More sharing options...
John Dowson Posted January 24, 2022 Report Share Posted January 24, 2022 Hi, sorry for the delay in replying. This is an area of FSUIPC that I am not that familiar with (at the moment!), but I have discussed this with Pete. First, it seems that you would like one of two options: 1. Adding NMEA out sentences for $GPMWV / $GPMWD, or 2. Add IAS/TAS info, via custom NMEA sentences, so that wind info can be calculated from external sources Is this correct? For 1, I am not sure that this information is available. There are simvars for ambient wind relative wind velocity: AMBIENT WIND DIRECTION: Wind direction Degrees (TRUE, not relative) AMBIENT WIND VELOCITY: Wind velocity Knots AMBIENT WIND X: Wind component in East/West direction. Meters per second AMBIENT WIND Y: Wind component in vertical direction. Meters per second AMBIENT WIND Z: Wind component in North/South direction. Meters per second STRUCT AMBIENT WIND X: (latitude), Y (vertical) and Z (longitude) components of the wind. Feet per second RELATIVE WIND VELOCITY BODY X: Lateral speed relative to wind Feet (ft) per second RELATIVE WIND VELOCITY BODY Y: Vertical speed relative to wind Feet (ft) per second RELATIVE WIND VELOCITY BODY Z: Longitudinal speed relative to wind Feet (ft) per second I could possibly construct a MWC sentence using these ambient wind simvars - from the NMEA 0183 protocol: MWV Wind Speed and Angle 1 2 3 4 5 | | | | | $--MWV,x.x,a,x.x,a*hh 1) Wind Angle, 0 to 360 degrees 2) Reference, R = Relative, T = True 3) Wind Speed 4) Wind Speed Units, K/M/N 5) Status, A = Data Valid 6) Checksum However, I have no details on the sentence to be used for MWD - from the same document: MWD Wind Direction & Speed Format unknown Do you have any details on how to construct such a sentence? Or would just adding the MWV sentence suffice? For 2, do you have any information on the custom sentences required? IAS is already included in the RPY sentence (as speed KIAS*10). but not TAS. John Link to comment Share on other sites More sharing options...
John Dowson Posted January 24, 2022 Report Share Posted January 24, 2022 Also, are you sure that it is IAS/TAS that you need? No wind element can be derived from IAS/TAS. You would need TAS and GS. The wind only affects GS not the craft’s airspeed. The difference between IAS and TAS is caused by air density. At low altitudes they are pretty nearly identical, but at higher altitudes the measured airspeed (IAS) is lower than the true airspeed (TAS) because there’s less pressure. John Link to comment Share on other sites More sharing options...
Skymaster 9999 Posted January 28, 2022 Author Report Share Posted January 28, 2022 Thank you very much for your kind answer. I am not a big expert on this matter, but I will tinker with it. I guess that MWV sentence coud be enough. Borgelt protocol is described at the end of this manual http://www.borgeltinstruments.com/B50man.pdf Link to comment Share on other sites More sharing options...
John Dowson Posted January 28, 2022 Report Share Posted January 28, 2022 18 minutes ago, Skymaster 9999 said: I am not a big expert on this matter Me neither! Let me know how you get on. I could look into adding an MWV sentence at some point if absolutely required, although I'm not sure when I will have time to look into this at the moment. I will add it to my 'todo / to investigate' list, and let you know when I get time to look into this in more detail. I am currently very busy just keeping up with the MSFS releases (as well as the P3D ones....)! John Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now