Translations:KAVAN Dingo A3 glider kit 796mm - Instruction manual/12/en

From KAVAN RC Wiki

Pin down the pre-shaped balsa leading edge 2 and the trailing edge 3 (please note – there is left and right one – match the notches to the plan). Glue the balsa ribs 1 in place. Glue the balsa root rib 4 between the leading and trailing edges – the bevelled side towards the root of the wing half (Det. F–F).