RE: Yellow Aircraft F-22 ARF Assembly Thread
Because the rudders of two fins pull-out last time of flight at nearly the same moment(only level flight,not very fast).After our examination,the base of hinge is only constructed by balsa wood.The builder ,our friend,didn't reinforced the base of hinge with epoxy comboned fiberglass issue ,only increased the numbers of hinge(7 large Robart hinges).However,it is not enough.Therefore,please note this point.