Edoradar Posted September 21, 2020 Report Share Posted September 21, 2020 Hello Peter, as I'm workin on some coding to emulate avionic IRS data, I'm having some doubts about velocities, rates and accelerations avail in fsuipc vs p3d sdk description Following I copied the SDK description and what I think are the equivalents in FSUIPC. could you please confirm me that this is correct as the descriptions seems to mismatch? Also, is any way to calculate and add or retrieve from fsuipc: track angle rate, flight path angle and flight path acceleration? Thank you very much VELOCITY WORLD Z Speed relative to earth, in North/South direction 3190 label 366 VELOCITY WORLD X Speed relative to earth, in East/West direction 3198 label 367 VELOCITY WORLD Y Speed relative to earth, in vertical direction 31A0 ACCELERATION WORLD X Acceleration relative to earth, in east/west direction 31C0 label 363 ACCELERATION WORLD Y Acceleration relative to earch, in vertical direction 31C8 label 364 ACCELERATION WORLD Z Acceleration relative to earth, in north/south direction 31D0 label 362 VELOCITY BODY Z True longitudinal speed, relative to aircraft axis 3090 VELOCITY BODY X True lateral speed, relative to aircraft axis 3098 VELOCITY BODY Y True vertical speed, relative to aircraft axis 30A0 ACCELERATION BODY X Acceleration relative to aircraft axis, in east/west direction 3060 label 332 ACCELERATION BODY Y Acceleration relative to aircraft axis, in vertical direction 3068 label 333 ACCELERATION BODY Z Acceleration relative to aircraft axis, in north/south direction 3070 label 331 ROTATION VELOCITY BODY X Rotation relative to aircraft axis 31A8 label 336 ROTATION VELOCITY BODY Y Rotation relative to aircraft axis 31B0 label 337 ROTATION VELOCITY BODY Z Rotation relative to aircraft axis 31B8 RELATIVE WIND VELOCITY BODY X Lateral speed relative to wind 3180 RELATIVE WIND VELOCITY BODY Y Vertical speed relative to wind 3188 RELATIVE WIND VELOCITY BODY Z Longitudinal speed relative to wind 3178 PITCH RATE (fsuipc only, no description in sdk) 30A8 label 326 ROLL RATE (fsuipc only, no description in sdk) 30B0 label 327 YAW RATE (fsuipc only, no description in sdk) 30B8 label 330 Link to comment Share on other sites More sharing options...
John Dowson Posted September 21, 2020 Report Share Posted September 21, 2020 44 minutes ago, edo17982 said: ROTATION VELOCITY BODY X Rotation relative to aircraft axis 31A8 label 336 ROTATION VELOCITY BODY Y Rotation relative to aircraft axis 31B0 label 337 ROTATION VELOCITY BODY Z Rotation relative to aircraft axis 31B8 ROTATION VELOCITY BODY X is 30A8, i.e. Pitch Rate ROTATION VELOCITY BODY Y is 30B0, i.e. Roll Rate ROTATION VELOCITY BODY Z is 30B8, i.e. Yaw Rate 31A8 is STRUCT WORLD ROTATION VELOCITY X 31B0 is STRUCT WORLD ROTATION VELOCITY Y 31BB is STRUCT WORLD ROTATION VELOCITY Z The rest are correct. 52 minutes ago, edo17982 said: Also, is any way to calculate and add or retrieve from fsuipc: track angle rate, flight path angle and flight path acceleration? Not sure about this - I'll get back to you... Link to comment Share on other sites More sharing options...
John Dowson Posted September 21, 2020 Report Share Posted September 21, 2020 For the flight path angle, there is a lua script called 'HUD Parameters for FSX' over on avsim that calculates this - you could take a look to see how this is done: https://library.avsim.net/esearch.php?CatID=fsxutil&Name=&FileName=&Author=&DLID=&Sort=Author&ScanMode=0 Extracting the relevant parts from that script: Quote vs_fs_units = ipc.readSD(0x02C8) --get vertical speed, signed, as 256 * metres/sec. For ft/min conversion is *60*3.28084/256 vs = vs_fs_units * 60 * 3.28084 / 256 -- convert to ft/min vs = math.floor(vs + 0.5) -- round to NO decimal places (nearest integer) gnd_spd_meters_per_sec = ipc.readUD(0x02B4)/65536 --ground speed as meters/sec gnd_spd_kts = gnd_spd_meters_per_sec * 1.9438 --convert to knots gnd_spd_kts = math.floor(gnd_spd_kts + 0.5) -- round to NO decimal places (nearest integer) fpa_degs = (180/3.1416)*math.atan(vs/(gnd_spd_kts*6076.12/60)) -- must convert NM/hr to ft/min and radians to degrees fpa_degs = math.floor(fpa_degs*10 + 0.5)/10 -- round to 1 decimal place Link to comment Share on other sites More sharing options...
Edoradar Posted September 21, 2020 Author Report Share Posted September 21, 2020 Hmmmm ok. maybe you can help me to clear it further… here are the arinc labels about accelerations, rates and angles that I need to get value for from fsuipc and the assignements I did. If you tell me if in your opinion something is mismatching or you can help filling would be very helpful Body Pitch Rate label 326 offset 30A8 Body Roll Rate label 327 offset 30B0 Body Yaw Rate label 330 offset 30B8 Body Longitudinal Acceleration label 331 offset 31B0 Body Lateral Acceleration label 332 offset 31A8 Body Normal Acceleration label 333 offset 31B8 Flight Path Angle label 322 (180/3.1416)*math.atan(vs/(gs*6076.12/60)) Flight Path Acceleration label 323 Track Angle Rate label 335 Pitch Attitude Rate label 336 Roll Attitude Rate label 337 Along Track Acceleration label 362 offset 31D0 Cross Track Acceleration label 363 offset 31C0 Vertical Acceleration label 364 offset 31C8 N-S Velocity label 366 offset 3190 E-W Velocity label 367 offset 3198 Link to comment Share on other sites More sharing options...
Edoradar Posted September 21, 2020 Author Report Share Posted September 21, 2020 6 minutes ago, John Dowson said: For the flight path angle, there is a lua script called 'HUD Parameters for FSX' over on avsim that calculates this - you could take a look to see how this is done: https://library.avsim.net/esearch.php?CatID=fsxutil&Name=&FileName=&Author=&DLID=&Sort=Author&ScanMode=0 Extracting the relevant parts from that script: Nice! I will try it later. one less to sort 😄 Link to comment Share on other sites More sharing options...
Edoradar Posted September 21, 2020 Author Report Share Posted September 21, 2020 6 hours ago, John Dowson said: For the flight path angle, there is a lua script called 'HUD Parameters for FSX' over on avsim that calculates this - you could take a look to see how this is done: https://library.avsim.net/esearch.php?CatID=fsxutil&Name=&FileName=&Author=&DLID=&Sort=Author&ScanMode=0 Extracting the relevant parts from that script: Tried it now in my python script and works well. numbers seem to be good. Thanks for the find. If you can give me a feedback on my last reply would be helpful! Thanks again Link to comment Share on other sites More sharing options...
John Dowson Posted September 22, 2020 Report Share Posted September 22, 2020 I'm sorry but I just don't have time at the moment. I would have to look them up and work out what the mapping is (from the FSUIPC and P3D documentation), just as you would. I've shown you what is wrong with your initial post, so hopefully you have enough information to do this yourself. Otherwise I can take another look when I have time, but I'm very busy on MSFS issues at the moment, and can't see myself having much time for this type of query for the next few weeks at least. Link to comment Share on other sites More sharing options...
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