Thank you for this report. We’ve moved your topic into the User Support Hub.
The Bug Reporting Hub is for posting suspected or confirmed bugs that other users are able to reproduce without duplicating an existing bug report. Using the template or providing all the relevant information about your bug and sim setup is required in order to provide valuable information, feedback, and replication steps to our test team.
If you are not sure if your issue is a bug or need further input from the community, please use the User Support Hub category. If the community can replicate your issue, first search the Bug category to see if there’s an existing topic. If it already exists, contribute to that report. Duplicate bug reports will be closed.
If you believe it is a new report and no duplicate exists, then create a new bug topic using the provided topic template.
All issues caused by or involving third-party addons/mods should be reported to the third-party developer. Assure that no addons/mods are used when reporting issues in Bug Reports.
Back taxi with the reversers? That’s not a procedure allowed on a 777, and even if it would work (I doubt that, but we’ll never know because nobody has ever done it), it is something we do not attempt to model. We have no intention to change this behavior because we believe it to be correct.
A 777 that is not very heavy will start to roll on idle. Big twins do that because they need to have huge engines. So that’s certainly not a bug.
Just to play devil’s advocate. I agree that in real life, you wouldn’t engage the reverser to move the 777 backwards.
I’m also curiosity here, under pure “physics”, not what the plane is supposed to do IRL, would the reverser powerful enough to move the vehicle backwards?
I just spawned on rwy 4L KORD and as luck would have it, she started rolling forward which was arrested with a brief application of reverse thrust. After stowing the reversers, I applied the brakes to reset for a taxi test: Released the brakes, applied a little thrust to get her rolling, then the reversers to a stop. All exactly as expected.
My understanding is, on high bi pass turbo fans the reverser only redirects the bipass air and the thrust from the actual turbine is still directed rearwards. So idle reverse might not be enough to stop the 777. I could be wrong on this though as I don’t know the 777 well enough
Yes you are correct. With the cold stream cascade thrust reverser, turbine thrust is not redirected. But it is the high bypass fan that provides the momentum.
Actually, no, the pitch of the ground is not clear to me in your clip. Putting that aside, did you do another taxi test or two before posting your video and claim here? Assuming you must have done a few repeatable tests to confirm your model was broken before spending the time to make a video, and if so, what were those tests so we can try to replicate?
There is nobody here who can answer this question, as the engine manufacturers and Boeing do not allow it, and it has never been done.
To be clear, we did not design our 777-200 to roll backwards under its own power and there are no plans to do so. There are other aircraft that can do it and they have all been designed with that in mind (so engines not very low to the ground etc).
I did several tests. The 777 will not reverse with full reverse thrust from both engines. But it will backup if I use reverse thrust on only one engine.
What throttles do you have and what bindings do you use for reverse thrust? I want to try your bindings.
Had a similar argument about the 737 a couple of years ago not reversing from a stand still or if it did then it would launch at a very high speed forward when cutting the thrust back to idle. Was told the same/similar. Prohibited action in real life so we won’t do it, even though realistically it could happen. Then a few updates ago, suddenly the 737 was doing it.Maybe someone may change it later.
Exactly! Reversing in a 777 with RT may be prohibited but is still possible in real life. So it should be modelled. Using hard left rudder at touchdown is prohibited but it is modelled. Using full right aileron at touchdown is prohibited but is modelled.
