Translations:KAVAN FS400AR - Instruction manual/18/en

From KAVAN RC Wiki

Securing the Propeller to the FS 400AR

When securing the selected propeller to the FS 400, it is recommended to use the Propeller Safety Locknut Assembly, included with the engine, to prevent the propeller from flying off or splintering, even if it loosens. Be sure to securely tighten the propeller nut.
Installation of the propeller is as follows: