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(3D) Throttle position is not proportional to input axis

By @nenenui
    2022-12-09 11:14:55.027Z

    v1.0.4 … (which is when I made the screenshots, but I guess this also applies to 1.0.5)

    While looking at the 3D throttle in the cockpit I realized that it "feels odd". Especially at the beginning and the end this is very noticable.

    • The 3D throttle position is not proportional to throttle input axis

    I made some screenshots to validate my feeling …

    and you can see:

    • The Virpil raw data display ... which I used to find the proper axis positions
    • the 3D throttle at 10%
    • and red markers for the … 0, 5, 10, 20 and 30% position
      • and in MSFS my throttle axis has a fully linear sensitivity

    I can see many good reasons why the throttle position will not have a linear impact on the rotor power. But I would expect that the HOTAS axis gets a linear mapping to "its" 3D representation … because it feels (looks) strange, when I move my hardware throttle, and the 3D objects basically does not move at all.

    Solved in post #3, click to view
    • 6 replies
    1. K
      @kawfeebassie
        2022-12-09 17:20:06.343Z

        I can certainly concur with this. I have a Pro-Flight Helicopter Trainer with a cyclic, collective, etc. During final approach when the nacelles are greater than 75 degrees and your speed drops into that final approach mode where you need to control your descent in the 0-500 fpm range, it was almost impossible to stabilize power for the correct descent profile. I would barely touch my collective and I would be getting huge vertical speed variations where I would be see-sawing between climbing at 1000 fpm or descending at 1000+ fpm. Despite comfortably flying many other helicopters in both X-Plane and MSFS in realistic flight modes, I was flying the Osprey in easy mode because inducing VRS on final was a crap shoot I had very little real control over.

        Creating a custom sensitivity curve for my collective axis was necessary to solve this problem, something I actually have never had to do before. In perspective, I guess it is not uncommon, since it seems depending on your particular flight controls, and lot of virtual pilots end up customizing these curves for a lot of aircraft. The curve that ended up working for me is attached. It shortened the lower power curve and made the high power curve much longer so I have more fine-grained control for final approach.

        1. In reply tonenenui:

          I believe the two issues reported here are different.

          Regarding throttle animations, I'll take a look as this is likely an easy fix. Animations on 3DS Max are by default non-linear, it may just be that we missed linearizing the animation for the throttle.

          Now, regarding the power curve - this is not related to the throttle animation. At a high nacelle angle, it does require some practice to get used to throttle control as it's a very fine balance and the risk of entering a VRS is high. Adjusting the sensitivity curve would definitely assist you and that is purely subject to personal preference. Sensitivity and granularity also varies greatly between different throttle quadrants.

          ReplySolution
          1. J@JohnWicks
              2023-02-07 13:31:26.790Z

              I'm having this exact issue of my throttle vibrating back and fourth like it's having a fit. I've tried everything to fix it but it won't stop. For me it starts as soon as I put the plane into autopilot with the speed set to hold. If I turn off the hold button it stops. If I turn off autopilot it stops. I have a Virpil throttle and this doesn't happen in any other plane I own for MSFS or DCS. I hope there is an update coming for it as I love the plane but this vibration is too annoying. Thanks.

              1. This is in fact a different (known) issue, currently being addressed. It happens with some throttle quadrants with higher refresh rate. Will be fixed shortly.

                1. J@JohnWicks
                    2023-02-07 13:58:20.498Z

                    Thanks, keep up the great work.

              2. Progress
                with handling this problem
              3. @nenenui
                  2024-11-05 21:40:16.164Z

                  I just revisited this issue in the latest v1.4 Osprey release … and it is still present.

                  With a linear axis mapping in MSFS I see those 3D positions of the throttle:

                  Perhaps MSFS2024 provides a way to resolve this.