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Taxi drag increased after SU12

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    #1

    Taxi drag increased after SU12

    After the SU12 and the appropriate update to PMDG B737 were installed, the taxi requires a lot more thrust (up to 30%N1) to maintain the constant speed, causing the aircraft decelerates rapidly at IDLE thrust (with rate about of 1 kt per 2 secs).
    Regards, Leonard Dewers
    Tags: None
    • Likes 3
    #2
    I noticed this, too. It was better before the update. I was glad that it was adressed and improved to previous versions but now it has chanaged again. I'm starting to ask myself how other developers do these things without being affected by MSFS updates.
    Last edited by Hendrik96; 22Mar2023, 21:58.
    ​
    Hendrik Schall

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      #3
      This is my only gripe about the 737 after SU12. It seems like it takes way too much thrust to start moving. And too much to keep moving. I do not have time in the real plane. But I do have time in the Max8 simulator. Things do seem off with the thrust after SU12.
      • Likes 2

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        #4
        Also confirming it from my end, had a ramp weight of 52.6T on the BBJ1 and needed close to 40% N1 to break free.
        Onela Pivra [ATPL (A/H) ME CFII]
        [email protected] GHz, Nvidia RTX 4090, 16GB DDR4 3200, 4K samsung UJ59

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          #5
          UPDATE: the issue appears to occur only after first and subsequent landings (no blown tires of course). Before the first takeoff the aircraft rolls perfectly as before the update.
          UPDATE2: not after every landing, so I continue investigating...
          Last edited by leon737; 23Mar2023, 19:46.
          Regards, Leonard Dewers

          Comment

            #6
            had the same issue today..flying from CYVR to KJAC.. taxi out was fine.. but after landing it needed constant power to keep the taxi speed up.
            Tonny koops
            EHGG

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              #7
              Cool brakes, replace brakes, replace tires help any?
              Mike Miles

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                #8
                brake temp was fine.. no flats either
                Tonny koops
                EHGG

                Comment

                  #9
                  Originally posted by Koopsttk View Post
                  brake temp was fine.. no flats either
                  Had the same issue today. The bird came to a stop after landing taxi turnoff. Took considerable amount of thrust to get moving and stay moving. Replaced my tires and everything worked right again. Maybe after X amount of landings the tire(s) causes an problem?
                  Mike Miles

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                    #10
                    was my first landing in the 736 after the update
                    Tonny koops
                    EHGG

                    Comment

                      #11
                      #metoo!!!!
                      Mark "Crabby" Crabtree AAL311 | PHL
                      I7-9700KF | 2070 Super | Honeycomb Alpha/Bravo | MFG Crosswind

                      Comment

                        #12
                        I've noticed the same. Perhaps it's more realistic? But I really don't think it would be.

                        With single engine taxi I have to maintain 45-50% n1 while crawling into the gate after landing.
                        Ben Yonge ✈️

                        Comment

                          #13
                          Originally posted by BeerBong89 View Post
                          I've noticed the same. Perhaps it's more realistic? But I really don't think it would be.

                          With single engine taxi I have to maintain 45-50% n1 while crawling into the gate after landing.
                          Definitely not more realistic, Asobo simply changed something last minute in the background which messed a custom taxi model over again... not surprising. Where's my facepalm emoji?
                          • Likes 3

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                            #14
                            Originally posted by Emi View Post
                            Definitely not more realistic, Asobo simply changed something last minute in the background which messed a custom taxi model over again... not surprising. Where's my facepalm emoji?
                            I got you.
                            Fail.png
                            Captain Kevin

                            Kevin Yang
                            • Likes 1

                            Comment

                              #15
                              Originally posted by Emi View Post

                              Definitely not more realistic, Asobo simply changed something last minute in the background which messed a custom taxi model over again... not surprising. Where's my facepalm emoji?
                              My favorite

                              facepalm.jpg
                              ...
                              Dan Downs KCRP
                              i7-10700K 32GB 3600MHz 3080Ti
                              • Likes 1

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                                #16
                                At LGHI from IniBuilds, I had a some sort of the same issue. After landing I was able to taxi to apron without any problems, but after the engine start for the return sector the -700 did not move anymore, even with almost TKOF thurst power (parking brake was released, no blocks, no failures).

                                maybe Asobo made some changes regarding the ground materials friction model. I will do some more testing and than I will send a more detailed ticket to PMDG.
                                Thijmen Faasse

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