Translations:KAVAN DARA A1 (F1H) 1200mm - Instruction manual/21/en

From KAVAN RC Wiki

If you consider installing a timer (either mechanic or electronic) and dethermalizer, now it is the time to trim the openings in the fuselage block 24 as needed. Do not forget to cut an appropriate opening in one of the side covers (26 or 28) as well.