The structure of a plane can not be altered, but only strengthen......a carbon spar can be glued in, if the plane had a spar.....a trailing edge can be made from hardwood if it had one made from balsa.....spoiler can be added, but only on top of the wing surface, NO CHANGES OF AIR FOIL, EXTERNAL STRUCTURE (ADD SHEETING) WING SHAPE (ADD OR SUBTRACT SPAN OR SHAPE)....
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