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How to manually add new SU10 ground friction variables

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    How to manually add new SU10 ground friction variables

    Hi,

    I could not wait until the next PMDG update so I went ahead and added the variables manually. Luckily, FBW have already created a pull request with the new variables and values they found realistic. All I did was copy those parameters to the bottom of the flight_model.cfg of the PMDG under [Flight Tuning]. If you want to find out more about new variables, check the sdk documentation. In short, the variables allow you to set how much the stickiness of the wheels decreases with speed and to prevent cross wind from being cancelled out. Without the crosswind variables set to the respective values crosswind is cancelled out at first and added gradually as you speed up which is not realistic at all. Overall, I found the ground handling during take off and landing to be much improved and I very much hope PMDG will add these natively very soon. Until then you can do what I did and paste these lines in the flight_model.cfg at the very bottom:

    ground_crosswind_effect_zero_speed=-1000
    ground_crosswind_effect_max_speed=-1000
    ground_high_speed_steeringwheel_static_friction_sc alar=1
    ground_high_speed_otherwheel_static_friction_scala r=1‚Äč

    Again, the values are from FlyByWire since I couldn't be bothered to do my own testing but everybody is welcome to play around with friction variables. The crosswind ones are already set such that crosswind is never cancelled out. I hope this is useful and have fun,
    Mark Tegge

    #2
    Giving it a whirl.
    Angelo Cosma

    Comment


      #3
      oh wow, thanks! had no idea this is something that could be setup manually. gonna try this on the dc-6 too

      cheers,-andy crosby

      Comment


        #4
        Interesting idea.

        X Plane does this much better than MSFS.
        Last edited by HDR10; 23Sep2022, 04:16.
        Tom Clarkson

        Comment


          #5
          Thanks very much Mark, this is very good news, finally, with some tweak, we could get closer to the center line and recreate crosswind landings more realistically. Thanks again for sharing.
          Sergio Naiberg

          Comment


            #6
            Backup the original before making changes.
            George Morris

            Comment


              #7
              Can someone please tell me where that flight_model.cfg file is located? I am having a really hard time finding it. Thanks.


              Edit I found it. Finally.
              Last edited by ram1220; 23Sep2022, 22:40.
              Robert Morse

              Comment


                #8
                Originally posted by ram1220 View Post
                Can someone please tell me where that flight_model.cfg file is located? I am having a really hard time finding it. Thanks.


                Edit I found it. Finally.
                [Drive Letter]\[Root of your MSFS Directory]\Community\pmdg-aircraft-738\SimObjects\Airplanes\PMDG 737-800
                Best regards,
                Miguel Conceicao

                (LPPT)

                Comment


                  #9
                  For someone who has already tested and understands a little more about the SDK, do you have any other suggestions on the values established by FBW?
                  Fernando Porto

                  Comment


                  • meurkel
                    meurkel commented
                    Editing a comment
                    I can't test any changes to the values properly since I'm not a real pilot. I hope Emi and the other members of the tech team give PMDG enough input to find the best values. All I can say is that it feels a lot more realistic now, which makes sense since the variables resemble real physical effects.

                  #10
                  FBW is not PMDG and only the PMDG Devs could let us know the effects of changing these values. Hence my suggestion to ensure you backed up before changing anything.

                  Changing these values without PMDG guidance is experimenting and at your own risk. Proceed accordingly.
                  Last edited by Falcon99; 25Sep2022, 03:36.
                  George Morris

                  Comment


                  • meurkel
                    meurkel commented
                    Editing a comment
                    I did back up everything. Don't worry.

                  #11
                  I don't think that there is much risk. The first two parameters - ground_crosswind_effect_zero_speed and ground_crosswind_effect_max_speed - if set to -1000, tell the sim to never cancel out the effect of crosswind. The second two - ground_high_speed_steeringwheel_static_friction_sc alar and ground_high_speed_otherwheel_static_friction_scala r - specify how much the tires will resist lateral movement. 1 is the default value, so specifying 1 in the config file has the same effect as not specifying it - in other words it is not changing anything.
                  Last edited by PositiveZero; 26Sep2022, 13:42.
                  Charles Vomacka

                  Comment


                    #12
                    Originally posted by PositiveZero View Post
                    I don't think that there is much risk. The first two parameters - ground_crosswind_effect_zero_speed and ground_crosswind_effect_max_speed - if set to -1000, tell the sim to never cancel out the effect of crosswind. The second two - ground_high_speed_steeringwheel_static_friction_sc alar and ground_high_speed_otherwheel_static_friction_scala r - specify how much the tires will resist lateral movement. 1 is the default value, so specifying 1 in the config file has the same effect as not specifying it - in other words it is not changing anything.
                    I tend to agree with Charles. I tested these variables and values with my 737-800 and didn't notice any improvement regarding aircraft sideways movement on ground, that is, the aircraft continues to randomly drift sometimes to the left others to the right during take-off and landing roll, requiring constant and vigorous rudder correction.
                    To be honest, I must say that this behavior is previous to SU10, so I think that the implementation of wind gusts neither improved nor worsened things.
                    Best regards,
                    Miguel Conceicao

                    (LPPT)

                    Comment


                      #13
                      I think that crosswinds in the sim have improved. I think that the issue you are seeing is because the values of 1 for ground_high_speed_steeringwheel_static_friction_sc alar and ground_high_speed_otherwheel_static_friction_scala r, don't change anything. It is still to be seen if better values are entered for those parameters, if it will make ground handling realistic.
                      Charles Vomacka

                      Comment


                        #14
                        Quick question for those who have tried this suggested edit and aren't satisfied with the results. Did you copy/paste the entries as provided by the OP? It looks like there may be some unintended spaces in there which may be preventing this from working.
                        Tim Lincoln
                        My YouTube Channel

                        Comment


                          #15
                          The spaces seem to have to do with posting them here. I tried to remove the spaces in the post, and they are always put back. In the config file I ensured that there were no spaces.
                          Last edited by PositiveZero; Yesterday, 18:14.
                          Charles Vomacka

                          Comment


                            #16
                            To all those who say nothing changed with the edit, did you test in a strong crosswind?
                            Mark Tegge

                            Comment


                              #17
                              Originally posted by meurkel View Post
                              To all those who say nothing changed with the edit, did you test in a strong crosswind?
                              Well, if in calm wind conditions or with no wind at all, I'm frequently struggling to keep the aircraft aligned with the runway centerline, can you imagine what it would be in the presence of strong crosswinds???
                              For me the key point is not to have crosswind, or gusts, or even hurricanes. The point is that it would be nice if the aircraft had a decent ground behavior, taking in good account the tire-to-ground friction effect.
                              But, as this was already mentioned several times earlier, it's a problem with MSFS, not with PMDG specifically.
                              Best regards,
                              Miguel Conceicao

                              (LPPT)

                              Comment

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