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Thread: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
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Old 11-06-2016 | 01:07 PM
  #1720  
Brenner
 
Joined: Jul 2007
Posts: 806
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From: Bridgman, MI
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The bearings should last forever.

The only failure mode that you need to be concerned about is fretting of the motor rotor shaft, and this is unlikely because the shaft has been hardened to 60RC.

Brenner ...
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