It has been determined that the two-blade Warp Drive propeller is
not enough propeller to absorb the horsepower from the 912S. Even
short-term use may result in fractures at the hub end of the
blades.
It is recommended to stop use of the two-blade propeller
and replace it with the three-blade Warp Drive or a two-blade Sensenich wood propeller. With use of the three-blade Warp Drive a
thorough inspection of the propeller hub and blade roots is
required every 25 hours.
Please take action before your next
flight.
Thank you for your attention to this matter. Hopefully we have not
inconvenienced you to any great degree. Fly safe!
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