I think I read earlier in the thread that some were getting longer wing tubes in the belief that because the wing would take a longer tube, this would strengthen the support of the wing.
Sorry to say that this is not the case.
I opened up the wing servo hatches to take larger servo mounts. Apart from the generous amounts of hysol (now removed) I measured the length of wing tube support. It ends 200mm into each wing.
A longer tube can be fitted, but the extra length sits in open air & adds more weight. The existing tube is in fact 20mm to long.

Regards

Jim