Elite Models Acrocub Instruction Manual page 21

Apply glue to the pre-cut slot of the horizontal tail
front and back sides.
Apply glue to the inter-locking joining area of the
vertical tail.
Apply glue to the foam triangular stock.
Join the horizontal and vertical tail onto the fuselage.
Then secure them with glue.
Secure the fuselage cover plate onto the fuselage
using glue.
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