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  5. Strange flight model behaviour with flaps

Strange flight model behaviour with flaps

Scheduled Pinned Locked Moved PA-28 Warrior II
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  • V Offline
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    vbazillio
    wrote on last edited by
    #5

    Real life PPL pilot here also. I share the same feedback regarding the unrealistic behaviour of the plane during 1st notch of flaps extension. But I appreciate and understand the JF/Mark + flight model developer explaination.

    Would love that JP/Flight Model developer find an alternative for the next update.

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    • M Offline
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      mikexgrr
      wrote on last edited by
      #6

      Is this behavior in 2020 as well as 2024?

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      • P Offline
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        PiperFlyer
        wrote on last edited by
        #7

        Just came here to ask about this. I'm almost positive this change was introduced in the recent update in May. I don't recall this behavior prior to that, where it drops upon extending first notch of flaps. I was Googling and have also seen some conflicting information about whether or not this is how the real aircraft performs. From some of the comments here I get the impression that it should not be dropping like that when flaps are extended.

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        • S Offline
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          serge933
          wrote on last edited by
          #8

          I can confirm that forward pressure is required with additional nose down trim on approach. I flew a Warrior for the first time last week and noticed this was quite the opposite of what the JF warrior is doing in the sim. Previously I flew the Archer II quite a bit.

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          • W Offline
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            WannaBePilot_01
            wrote on last edited by
            #9

            100 percent the flaps are inverted. No aircraft goes nose down when the flaps go down. The aircraft in the aim slows down as it should and it feels like it has lift but it is 100 percent not supposed to be pitching nose down to the point you have to fully pull on the yoke to keep it from crashing.

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            • C Offline
              C Offline
              CdnCptMoustache
              wrote on last edited by
              #10

              In the cfg files there are a bunch of things related to how flaps behave and one of them is fore/aft movement of the COL when flaps are deployed. Modifying pitch up/down with flaps is rather trivial. I'll play around and report back here

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              • C Offline
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                CdnCptMoustache
                wrote on last edited by CdnCptMoustache
                #11

                I think I got it to a happy place.

                If you're not familiar with the MSFS file structure or have never done this before, I discourage it, but if you have you can replace these lines at the end of your warrior flight model file

                flaps-position.0 = 0, -1, 1, 1, 1, 0, 0
                flaps-position.1 = 10, -1, 1, 1, 1, 0, -0.2
                flaps-position.2 = 25, -1, 1, 1, 1, 0, -0.3
                flaps-position.3 = 40, -1, 1, 1, 1, 0, -0.4

                There's no impact to lift or overall handling of the plane other than to give the expected mild nose-up with flaps going down.

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                • C CdnCptMoustache

                  I think I got it to a happy place.

                  If you're not familiar with the MSFS file structure or have never done this before, I discourage it, but if you have you can replace these lines at the end of your warrior flight model file

                  flaps-position.0 = 0, -1, 1, 1, 1, 0, 0
                  flaps-position.1 = 10, -1, 1, 1, 1, 0, -0.2
                  flaps-position.2 = 25, -1, 1, 1, 1, 0, -0.3
                  flaps-position.3 = 40, -1, 1, 1, 1, 0, -0.4

                  There's no impact to lift or overall handling of the plane other than to give the expected mild nose-up with flaps going down.

                  R Offline
                  R Offline
                  roguefoodie
                  wrote last edited by
                  #12

                  @CdnCptMoustache
                  This fix is really helpful and would appreciate if you guided us on the name of the file and where the file is and how you changed this.

                  To the Justflight team, this fix is really important. I'm sure everyone is experiencing the same strange behaviour of the flaps causing nose down.

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                  • R roguefoodie

                    @CdnCptMoustache
                    This fix is really helpful and would appreciate if you guided us on the name of the file and where the file is and how you changed this.

                    To the Justflight team, this fix is really important. I'm sure everyone is experiencing the same strange behaviour of the flaps causing nose down.

                    C Offline
                    C Offline
                    CdnCptMoustache
                    wrote last edited by
                    #13

                    @roguefoodie It's a file called flight_model.cfg which you'll find buried in the aircraft install folder in Community. The lines to replace are right at the end of the file. Backup the original file somewhere first so you can easily set it back if something goes wrong.

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                    • P Offline
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                      PatSimHas
                      wrote last edited by
                      #14

                      Dear Just Flight team

                      First of all thank you for the amazing addons you are producing as well as the continued support for them! After already owning the Hawk and RJ Series, I‘ve just purchased the Warrior in the Microsoft Marketplace and it feels good and authentic to fly. Especially the behaviour during the landing flare reminds me of how the real aircraft feels. BUT the behaviour of the flaps is indeed wrong/the wrong way round - and I'm sure that nobody (especially with real world flight experience) would ever dispute this. I especially noticed it after takeoff when retracting the flaps from the first notch to the full up position - which made the nose of the aircraft rise considerably - in some cases even leading to a stall be because without trimming, I seemed to lack pitch authority to push the nose down far enough. This is completely the opposite of what both aerodynamic principles say and how a/the real aircraft behaves. The loss of lift when retracting the flaps should make the nose drop, requiring more back pressure on the yoke to maintain pitch attitude followed by a nose up re-trim to remove the need for back pressure on the yoke. And during flap extension, it should be the other way round of course - which unfortunately is also not the case.

                      I urge you to correct this as it definitely is a bug and ruins the otherwise outstanding feel and behaviour of this product. As for the workaround provided by CdnCptMoustache, I believe that it won't be possible for people who bought the add-on in the Microsoft Flight Simulator Marketplace to modify the flight_model.cfg due to the encryption.

                      Thank you and best regards

                      Patrik

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