RC Factory Complete set Yak 55 Instructions Manual page 6

Let's start with gluing the wing. The wings have differently sized semicircular protrusions. Therefore, it should
not happen that you glue the wings in reverse. Apply the activator to the middle part of the plane and glue on
the wing then press them firmly together. Be careful not to glue the ailerons. We apply the same procedure to
the second wing.
6