Another servo problem to ponder

[william krueger]

Sounds to me like you are on the edge of flutter
  ----- Original Message ----- 
  From: Patternrules at aol.com 
  To: discussion at nsrca.org 
  Sent: Saturday, February 21, 2004 8:53 PM
  Subject: Re: Another servo problem to ponder


  In a message dated 2/21/2004 7:11:48 PM US Eastern Standard Time, gene.maurice at comcast.net writes:
    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 is your engine soft mounted, and what hinges are you using?


  Steve Maxwell
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