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LNAV performance

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    LNAV performance

    Hey guys,

    Is anyone else noticing fairly underwhelming LNAV performance during turns? It seems as if it overshoots on most turns and even during minor turns it just seems very twitchy.

    #2
    Originally posted by Aden J L View Post
    Hey guys,

    Is anyone else noticing fairly underwhelming LNAV performance during turns? It seems as if it overshoots on most turns and even during minor turns it just seems very twitchy.
    Please check your Assistance Option and turn off all the items in PILOTING part.

    Tieyuan Sun

    Comment


      #3
      Originally posted by Aden J L View Post
      Hey guys,

      Is anyone else noticing fairly underwhelming LNAV performance during turns? It seems as if it overshoots on most turns and even during minor turns it just seems very twitchy.
      I have also noticed this, and I don’t have any Assistance Options enabled. However, this is not a complaint. This is v1.0 of the MSFS 737 and I am confident LNAV will be tuned in future updates. Despite the somewhat imprecise flight path during turns, this is still the best aircraft available today for MSFS. Looking forward to the next iteration.
      Doug Miannay (KATL)
      i7-8700K (OC 5.0GHz - HT Off) | ASUS Maximus X Hero Z370 | Corsair Hydro H150i Pro Cooler | ASUS STRIX-RTX2080TI-11G | 32GB G.Skill DDR4 TridentZ RGB 4000Hz | Samsung 960 Pro 512GB M.2 (OS/Apps) | Samsung 960 Pro 1TB M.2 (Sim/Games) | Corsair H1000i PSU | Fractal Design Define R6 Blackout Case | Win10 Pro x64

      Comment


        #4
        Originally posted by Aden J L View Post
        Hey guys,

        Is anyone else noticing fairly underwhelming LNAV performance during turns? It seems as if it overshoots on most turns and even during minor turns it just seems very twitchy.
        Yes absolutely Definitely alot smoother in p3d
        John C

        Comment


          #5
          Just an update if anyone is curious, I have just done a fresh reinstall and it seems to be operating a lot smoother now.

          Comment


          • Cleared_4_ILS
            Cleared_4_ILS commented
            Editing a comment
            A lot smoother as in a total different story?

          #6
          As PMDG has mentioned before a new LNAV model is being developed, so let's expect that.
          Bai Jian

          Comment


            #7
            Yeah it seems pretty sloppy when compared to the p3d version. Turns are abrupt, jerky, and it overshoots. I am aldo having this issue where the wings rock everytime I pass a fix at higher altitudes.
            -Mike Iacovetta

            Comment


              #8
              It's better than P3D, It's worse than P3D, like starting to read a Dickens novel.
              Mark "Crabby" Crabtree AAL311 | PHL
              I7-9700KF | 2070 Super | Honeycomb Alpha/Bravo | MFG Crosswind

              Comment


                #9
                Make sure all piloting assists are turned off for LNAV to work properly.
                Assists.jpg

                Jorge Juan
                PMDG BOEING TESTER.jpg
                https://photos.google.com/search/_tr...PADssWVy-FAENy

                Comment


                • Tomyg
                  Tomyg commented
                  Editing a comment
                  thank you very much!!!!

                #10
                I swear, the first flight after reinstalling went perfectly, and then all subsequent flights it went back to it’s old tricks…. very strange

                Comment


                  #11
                  I just wanted to chime in, as I haven't seen much discussion around this. I have also noticed a lot of overshoots, especially on SIDs and STARS, not so much during cruise. I'll leave an example which I have been able to consistently reproduce on every attempt: LROP departure, Runway 26R, SOKRU1M SID. I'd like to mention that speed limits were obeyed, and no pilot assistance is active within MSFS. Winds were also calm.


                  Another example, which I have only tried once, and is not as obvious. Slow speed (210-220kts), LNAV engaged, calm winds again, MOPU3D arrival into Runway 34L at LIRF. Again, this one isn't huge, but it is sloppy:

                  Sebastian Grach

                  Comment


                  • Crabby
                    Crabby commented
                    Editing a comment
                    I would be willing to bet that in real life the aircraft do not fly 90-degree turns with 90-degree corners. If they did there would be wings and bodies falling out of the sky all day long. The navigation system is computing speed and wind and making a safe turn based on finishing the turn heading in a certain direction to a certain place. What you have mapped is proper

                  • Lessar27
                    Lessar27 commented
                    Editing a comment
                    Crabby, you are being condescendingly facetious and deliberately misinterpreting my expectations. Both you and I know that I don't expect the aircraft to fly 90 degree corners. What I expect the aircraft to do is to properly anticipate a 90-degree turn and plot its route in such a manner that it does not overshoot. For an example, since you seem to need one, the turns on RF-462 and RF-463 are the kind of turns that I would expect to see. Overshooting shouldn't be a thing.

                  • Crabby
                    Crabby commented
                    Editing a comment
                    Were you flying with real weather? Wind changes at the point of turns will cause overshoot, undershoot and the system corrects for that as it happens. Pilots flying do this. The system calculates a turn based on current winds. Begins to make the turn and the winds change forcing a recalculation and a new path. Again, pilots hand flying have to do this all the time and probably better because of the feel of the airplane. Just because a computer is doing it does not mean it will be done better. When you said winds calm, did you mean no wind?
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