Mesh issue flipping PMDG over at LEMD

[Ephedrin]

Hello Riccardo,

I have just purchased the LEMD scenery for P3Dv5. I loaded a flight at Gate 576 with the PMDG 747-400 at almost max TO weight and attempted to taxi to RW 36L via A23, A22, A21, B1, B2, Z1.

On Taxiway A23 at around 8-10kts the airplane suddenly flipped over, did something like a half somersault and then stood there with massively shaking wings as they would happen in heavy turbulence. Eventually the airplane was still usable and I attempted to continue, entering RW36L from Z1 the same thing happened again. This time not as extremely as before, the plane was still usable. I set takeoff power and at some point, I can't tell where exactly but approximately 1000m down the runway the flip happened a third time screwing up my view and the whole plane.

I am very active in the PMDG forum and know about some issues at some airports (of some people in certain situations etc etc). Apparently issues like these happen at certain airports that "trick" elevation, have bridges etc. In my case I have taxied the PMDG 744 over bridges in T2G's Munich, DD's Moscow (UUEE) and Digital Design's Leipzig and haven't had any problems at all.

So I went to discover your Madrid airport a bit and as the P3D slew mode often exposes issues with the mesh/terrain I used it to look at these particular spots at the airport. I made a video of what I found and will add it below.

Also I taxied down RW36L with the Realair plane in the video and found some "heavy" bumps at some places that also might have caused this problem.

I would normally ask PMDG first whether they had a possibility to fix that but as far as I know they haven't been able to reproduce these issues at the other before mentioned airports and hence see it as a P3D or scenery developer problem. After all their aircraft just taxies along. Now that I found these mesh issues in the Madrid scenery I decided to ask you first.

Is there anything you can think of what you could do? OR: is this acutally an issue on MY end? I installed the airport just yesterday and haven't made a single flight from or to it with a heavy airplane.

I have seen some questiones in other threads so I have 84 files in my LEMD scenery folder, I use ORBX OC Europe, latest version of P3D5 and did a reinstall of client, and scenery.

Here the video: https://youtu.be/ofd1nx4Yfu0. I did a short tour across the airport at the end so you can have a brief look at the airport, maybe you notice something that might help.

Thank you
Marc

[RicardoLVFR]

Hi, LEMD we did not place any platforms, what we did and you showed on the video was, that on areas where the aircraft isn't supposed to taxi we lowered elevation so that it doesn't flicker with our customized mesh.

So the issues you see there on the video, show exactly the way is supposed to happen, if you taxi away from the taxiways and into the dirt that happens. But that's not an issue at all, since no one is supposed to go on those areas.

As for your problem, this is the first report we get about this, so my adivice will be to use another aircraft and see if it happens, if not, then there is something going on with the aircraft and the way it flows with the terrain elevations in LEMD. So let us know.

[Ephedrin]

Ricardo,

thanks for the quick reply and the explanation. Following your advice I tried it with the Aerosoft A330.

I wasn't able to replicate it on the Runway.

https://youtu.be/J1Z9rn98uG4

This is how it looks like from the outside. At another attempt without the recording active it was even worse and included the other side's gear too.

[RicardoLVFR]

Hi, just tried to do the same thing, and no problems in my end.

That area is completely flattened so I don't know what's going on with your system. Will keep testing.

[Ephedrin]

Alright, thank you. I haven't been able to reproduce it on the runways and as long as that's fine I can simply avoid this taxiway, the airport is certainly big enough. I don't rule out the possibility that it's a problem with another (scenery) addon here and if I find something I will let you know.

Btw, as I played around on the airport now: Outstanding performance for such a big airport.