Bug : Boeing 787-800's wings are trembling abnormally

[TheEagle]

I was flying from LFPO to EDDI today, and experienced weird tremblings of the wings - see the images above. I know that in the real world the wings do tremble sometimes (mainly in turbulences), but what I saw, would never happen in real world : The wings went really up and down, up and down, and one could think they would knot themselves up ! Even weirder is, that the aircraft continued flying as if nothing were happening. The trembling was already present on ground with all engines off. Inbetween the trembling sometimes stopped, but I have no idea why. If you need any more information, I am ready to provide it.

[cyyz_spotter]

Which 787 are you using? The 787 from github has a fix for this problem so it might be that you are using the FGAddon version.

[Thorsten]

Even weirder is, that the aircraft continued flying as if nothing were happening.

Not at all weird - the flight dynamics is completely independent of the visuals you get to see... So it would be no problem at all to show you a burning plane with engines dropping off that handles quite normally - or a visually intact plane that isn't flying any more.

[TheEagle]

@Thorsten, I mean it's weird, because, why would someone model the aircraft to do such things, if they don't influence the FDM ?

[TheEagle]

Which 787 are you using? The 787 from github has a fix for this problem so it might be that you are using the FGAddon version.

I am using the one from the official FlightGear hangar (FGAddon). Can you share a link for the one from GitHub ?

[Delta5142]

I believe it is this one: https://github.com/FGMEMBERS/787-8. This 787 also features a working pushback system and more liveries.

Regards

[cyyz_spotter]

Actually, the one I was talking about was https://github.com/IskenderWang/787-family

[Delta5142]

Oh yeah, I think the one cyyz_spotter posted is the correct and better one.

[legoboyvdlp]

If anything the correct and better one is the one you download in the flightgear launcher. If you use third party aircraft, you should probably speak to the author directly as on the forums people will provide support for the one that comes with flightgear.

[V12]

If all fails, You can try to find and erase the file wingflex.nas or other with similar name in the folder NASAL. Some years ago I solved my problem with that aircraft. But I'm not absolutly sure that this dirty trick will work on actual version.

[S&J]

If anything the correct and better one is the one you download in the flightgear launcher. If you use third party aircraft, you should probably speak to the author directly as on the forums people will provide support for the one that comes with flightgear.

This is a crock... If the author of the third party aircraft is here, he'll support it in the same way as if the author of a flightgear launcher plane is here.

There are many many planes in the flightgear launcher that are unsupported and have been unworked on for years. FgAddon planes don't come with a guarantee that they'll be worked on or for that matter come with a greater probability of getting a response here.

People use other hangers for their own reasons, which doesn't prevent them from visiting this forum or supporting their product via this forum.

[V12]

If all fails, You can try to find and erase the file wingflex.nas or other with similar name in the folder NASAL. Some years ago I solved my problem with that aircraft. But I'm not absolutly sure that this dirty trick will work on actual version.

I found solution - in the aircraft's -set.xml file (for example 787-8-set.xml) find something like this one :

Code: Select all

<wingflexer include="Systems/wingflexer-params.xml"/>
<property-rule n="100">
<name>wing flexer property rule</name>
<path>Aircraft/Generic/wingflexer.xml</path>
</property-rule>


and delete it. Before this operation, make backup copy of that file. No wingflex - problem solved.

[wlbragg]

Or you could try to diagnose and fix the wingflex issue.

[TheEagle]

Well, in fact, I don't want to make the wings completely unflexible - in reality they are flexible and tremble a bit sometimes. but A BIT, not twisting themselves into a knot

[wkitty42]

when the wingflex was originally developed and added to a number of craft, they would flap their wings like birds... it took those devs a little time to adjust the numbers to correct this flapping syndrome... IIRC, this wingflex code development was going on back about the time that fgmembers came along... it is very possible that the craft was snapped up into their repository and never received updated wingflex code even though it may look better and act better, in some respects, than the same craft in FGAddon... it depends on the maintainer of that craft and where their attention was at the time... and since then, really... obviously the craft in the fgmembers repository never got fixed with respect to the wingflex code...

just tossing that out there for consideration