The AP421CTF-WWR66U is a two blade propeller for use on small direct drive engines.  Its configuration is clockwise/tractor with the addition of a feathering facility. 

The performance gain from the AP4x constant speed hub, combined with the outstanding design of the Whirlwind U series blade, allows this propeller to perform over a very wide range of speeds.  As such it is an extremely popular model, finding application on a wide range of aircraft.


  • Designed for small direct drive engines (like UL260iS)
  • High strength AP421 CS hub with steel retention components
  • Fast response from high precision Maxon servo drive
  • Wide operating speed range from Whirlwind U 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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