Is Wing Flex controlled by the HornetFCS.dll file?
Hi Deacon

I am far from expert on this sort of thing but: Wing Flex is controlled by an effect in the FX portion of the Panel.cfg, either in the Panel.Fleet or Panel.BA folder. The line is gauge40=FX!Wingflex, under [Vcockpit01]. The actual .XML file is located in the FX folder contained within either Panel folder. Shorter answer, no, Hornet_FCS.dll doesn't have anything to do with it, other than distantly, and very peripherally.
I took a look at the .XML file, and from what I can see, it's dependant on 3 factors: G-force (5.5G), AOA (>5°), and TACPAC's presence. I am not certain just what TACPAC does to wingflex, but it IS in the file. I believe it has to do with load-out selected in TACPAC, causing weight and drag differences depending on which load-out is chosen. Thus, more weight on the wing, from bombs, rockets, etc, the less flex, more flex, or a different amount of flex depending on the weight of the load-out. I believe. Like I say, I am far from being an XML type of guy.
I will ask over on the forums for you if you want, or feel free to do so yourself. I think, although very rarely, that you need TACPAC enabled and operating to get the full wing flex effect. I may well be wrong on that, but from what I read in the .XML file, that's what I believe. It may just have the TACPAC lines in it for the different load-outs. No TACPAC, no weight on the wings, thus, a different effect.
Why your wing flex is inoperative, I can't say, but that's what I can see. It may be that it does require TACPAC to get the effect at all. I'll look at my plane, FSX:SE, NO TACAPC, and see what it does.
No real answer for P3D but the best I can do for you...
I installed v17.1.30.(and also the v17.1.31 update)...
As near as I can figure, the v17.1.31 is a stand-alone install, replacing the v17.1.30. I may be wrong on that. However, just so you know, be expecting more updates like this in the near future. There are still "things" they're working on. Details, but some important ones.
Hope this is some small help...
Pat☺