Another servo problem to ponder

[Del K. Rykert]

 Gene.,.. I would suspect possible slop in the gear train as possible culprit if these aren't new servos or been in for rebuild. Do you have any slop in your linkage or are the ailerons heavy?  You inferred you were in the servos doing some work.. Did you check the case for wear at the shafts points? The cases do get wore and won't hold the shaft in tight alignment causing you to strip gears on demanding loads such as a snap. Yes flutter and heavy surface load can also contribute but so far I don't have enough information to jump to that conclusion.

                             del 
               NSRCA - 473 
    Del

  ----- Original Message ----- 
  From: Gene Maurice 
  To: Nsrca-List 
  Sent: Saturday, February 21, 2004 7:10 PM
  Subject: Another servo problem to ponder


  Please help. I have stripped aileron servo gears FOUR times. At first I thought it was infant mortality followed by the dumb ass missed a piece of crud in the servo case. I don't think that's what happened

   

  Here's the setup. The plane is an Aries, JR 8231 servos. Plane and servos are less than four months old: about 60-70 flights. Right aileron has broken 3 times and the left has broken once (one each today). The breakage has always been slightly right of center on the output gear. There is no static binding. The hinge lines are sealed.  I can't be positive but I believe the gears are breaking during a down line snap. BTW, I snap to the right. I don't believe its flutter because the breakage is NOT at center. I don't believe its excessive travel because the breakage is not at the extremes of travel.

   

  Can the initial load of a snap place enough load on an 88 oz. servo to break a gear? I have used this exact same servo setup in two other planes. I did break a gear one in one of those planes. Again, I just chalked it up to wear.

   

  Confused and at a loss in Plano. 

   

  Gene Maurice

  gene.maurice at comcast.net

  Plano, TX

  NSRCA 877

  AMA 3408

   
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