Carf-Models Chengdu J-10 Instruction Manual page 27

Vector*final*installa(on*
Trial&mount&the&engine&and&
use&the&wood&strips&as&spacers&
unIl&the&engine&nozzle&is&well&
centered&in&the&vector&tube.&
You&also&need&to&take&care&that&
the&distance&from&the&rear&
edge&of&the&engine&nozzle&to&
the&intake&of&the&vector&tube&
measures&approx.&20&mm.&