The AP521CTF-WWR68A is a two blade propeller for use on the UL350iS engine. Its configuration is clockwise/tractor with the addition of a feathering facility. 

This propeller is designed specifically for high power direct drive engines. It is tailored for super smooth cross country and high speed flying, with excellent pull out on take off.


  • Designed for the UL350iS engines
  • High strength AP521 CS hub with steel retention components
  • Fast response from high precision Maxon servo drive
  • Wide operating speed range from Whirlwind A series profile blades
  • Hard wearing composite blade construction with inlaid Nickel leading edge protection
  • Easy to use AC200F electronic governor/controller
  • Easy installation with a wide range of pre-made installation kits

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