After several flights I am having the same issue with landing gear . I got the nose gear fixed only to have the mains start to get loose and finally give way . After fixing came in for a good landing only to have one half of the wing fold from front to rear over the back . After looking at the construction found that there really is not any except balsa . I sent my good half of the wing to Eureka Foam Core wings and they designed me a three piece foam core with the correct wash out and center section. After 6 months of building I have finished the wing and am very impressed with the outcome . Have not flown it yet it is rain in California but am expecting good things from this . I will try and post some pictures later .