Seagull Models Ultimate Instruction Manual page 19

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Lower wing.
B
THE CENTER RIB INSTALLATION.
Rib center
B
(2) 3x10cm.
Wing bolts.
C
E
ATTACHMENT WING.
See pictures below:
Upper wing.
(D) Lower wing tube:36.3cm.
(E) Upper wing tube: 24.5cm.
(D)
2 sets.
19