Throttle Servo Chatter

Discussion in 'General Plane Discussion' started by Slappy, Apr 21, 2015.

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  1. Apr 21, 2015 #1

    Slappy

    Slappy

    Slappy

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    Hello Guy's and Gal's, I have a problem maybe some of you can help me with. I have been getting some involentary servo movement on my throttle servo.Mostly hust below half throttle but it does happen at almos all positions except full throttle. At times it's all over the place and at times it's hardly noticable. I originally had a HiTec 645MG @ 6 volts, a friend said it might be the servo so I changed it out. Same problem wit a high torque Futaba servo. So I figured it might be some EMI from the OPTI KILL. Totally disconnected it and the same thing. Any suggestions? I don't understand, it's never been a problem in over a hundred flights and all of a sudden, Any opinions appreciated. Thanks, Slappy
     
  2. Apr 21, 2015 #2

    psycho-patch

    psycho-patch

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    Wire extension, connector or port it is connected to. Metal contact at carb linkage. Just a few suggestions to look at.
     
  3. Apr 21, 2015 #3

    kwilson

    kwilson

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    Also try another new servo.
     
  4. Apr 21, 2015 #4

    kwilson

    kwilson

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    What kind of receiver?
     
  5. Apr 21, 2015 #5

    Slappy

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    Rx is a Futaba R6008HS, ball link connection at carb w/ Sullivan flex line for pushrod. Someone mentioned a loose spark plug cap, anyone hear of this?
     
  6. Apr 21, 2015 #6

    psycho-patch

    psycho-patch

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    Yes! That's one that will mess with a lot of things! Make sure the plug cap is secure to the plug, insulated and grounded. Also a non resistor type plug can cause this kind of "noise" too!
     
  7. Apr 21, 2015 #7

    kwilson

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    Yes I think that could definitely be the cause. What kind of engine and ignition? Do you possibly have a picture of the set up?
     
  8. Apr 22, 2015 #8

    Tired Old Man

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    Loose cap on a plug and all hell can break loose anywhere, but the throttle servo is usually the first place it shows up.
     
  9. Apr 22, 2015 #9

    Slappy

    Slappy

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    I did notice that it was pretty dang easy to get that boot off last time. That will be the first place I go. I just got a new puppy and He's taking up most of my flying time these past few days. But He's worth it. I will tighten up that boot with a hose clamp (any other suggestions?) and re install that 645MG and Opti-Kill. Then kick the tires and light the fires. I'll let you know. Thanks
     
  10. Apr 22, 2015 #10

    Slappy

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    It's a DA 50 with a relativly new DA ignition
     
  11. Apr 24, 2015 #11

    Slappy

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    Well, once again the Knowledgeable folks at Team Flying Circus come through. A simple hose clamp on the Spark plug boot solved it. Thanks Team, I used the smallest hose clamp I could find but it seemed a little to large to get snugged up against the head. I will try to find a thinner band clamp with a longer band, the ones i have are thin enough but not long enough. Here is the reason I have not been able to fly as much this past week, Say Hello to " Bomber"
     

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  12. Apr 24, 2015 #12

    BRUTUS

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    Hey Bomber! This is Max!
     

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  13. Apr 24, 2015 #13

    Slappy

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    HI Max!! :thumbs:
     
  14. Apr 24, 2015 #14

    psycho-patch

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    Bomber, Max....say hello to Dexter. He's smiling at ya!
     

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  15. Apr 24, 2015 #15

    Slappy

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    Hey Dex!! I love when they lay down like that. I wish I could!!!
     
  16. Apr 25, 2015 #16

    thepamster

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    Those doggie pics are just so darn cute I can hardly stand it.
    Now what's this thread about? Lol.
     
  17. Apr 25, 2015 #17

    BRUTUS

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    Love them pups
     
  18. Apr 25, 2015 #18

    Slappy

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    Thanks Pam, Mine has the name that fits him well If you know what I mean!!! LOL!! He is a "Bomber"!!!
     
  19. Apr 25, 2015 #19

    psycho-patch

    psycho-patch

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    Dex's first Vet visit. This dog melted everyone's heart, all the vet staff and people were taking pic's of the guy in the waiting room.
     

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