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Thread: eRC Spitfire Elevator Servo Re-Attach

  1. #1

    eRC Spitfire Elevator Servo Re-Attach

    OK, after several flights in which I had to open her up and re-insert the elevator servo as in my previous post, it finally detached from the board. We were able to re-solder the wires to the board using online photos as guides, but now the servo spins continuously when power is added to the remote control.

    Any ideas?

    Thanks![attachment=1:3720z081]eRC Spitfire 1.jpg[/attachment:3720z081][attachment=0:3720z081]eRC Spitfire 2.jpg[/attachment:3720z081]
    Attached Thumbnails Attached Thumbnails eRC Spitfire 1.jpg   eRC Spitfire 2.jpg  

  2. #2
    Senior Member Jay Burkart's Avatar
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    Jun 2009
    Location
    Smithfield KY
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    Re: eRC Spitfire Elevator Servo Re-Attach

    Most likely the servo motor got pushed up out of its mount where the gears don't mesh.
    You have to reach up and above and push it down with some kind of tool.
    Look at the picutures I have posted of the top of the board and you can see
    how the motor goes in.
    Attached Thumbnails Attached Thumbnails Micro P-51-Spitfire cut open for access 008.jpg   Micro P-51-Spitfire cut open for access 009.jpg   Micro P-51-Spitfire cut open for access 007.jpg  

    SAM Grand Champion 2004.07,10,12

  3. #3

    Re: eRC Spitfire Elevator Servo Re-Attach

    Thanks, Jay. We originally had it in the mount, but once power is added the elevators deflect fully down without touching the remote control. I thought the motor should be "off" unless the up/down lever is moved. If the motor is not in the mount (free of the gears), it spins full-out when the power is applied.

    Is there a particular way the motor needs to go in, or does it just need to mesh with the gears?

    Does it look like we have it wired right?

  4. #4
    Senior Member Jay Burkart's Avatar
    Join Date
    Jun 2009
    Location
    Smithfield KY
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    214

    Re: eRC Spitfire Elevator Servo Re-Attach

    This is tough to explain but the feedback pot driven by one of the gears in that chain
    is not in the neutral position.
    You have to set that in neutral and then plug the motor into the bracket.
    Try setting the elevator to neutral and then plug in the motor.
    Regards,
    Jay Burkart
    SAM Grand Champion 2004.07,10,12

  5. #5

    Re: eRC Spitfire Elevator Servo Re-Attach

    Thanks. That makes sense, we'll see if we can do it.

    Essentially, the feedback pot is telling the servo motor that the elevator is not at neutral, so the motor is running to try to get it there. Since I don't have the motor connected, the state of the elevator doesn't change, so the motor keeps running.

    Off for some trial-and-error!

  6. #6

    Re: eRC Spitfire Elevator Servo Re-Attach

    OK, I think we've got it figured out. The servo seems to be wired backwards, so a down elevator command raises the elevator, which causes the feedback pot to ask for more down elevator, so the backwards servo rams the elevator all the way up, and the motor keeps running.

    We're going to unsolder the wires and reverse them. The idea of centering the elevator worked, as far as calming down the servo motor, but down for up and up for down seems to be the problem now.

    That, and the gear came off the servo - Luckily, it fell into the fuselage. Small part!

    Hopefully, we'll end with good news later tonight. If anyone thinks we're going in the wrong direction, let me know!

  7. #7

    Re: eRC Spitfire Elevator Servo Re-Attach

    Switched the wires successfully. Centering the elevator stops the servo motor from running. The down elevator control works proportionally (and in the correct direction).

    Unfortunately, the up elevator control does not work and the elevator does not return to neutral when the down elevator control is released.

    I'm at a loss again. Does anyone have any wise advice for this? If not, I may have to assume that the heat from the soldering iron may have damaged something on the board.

    Thanks!

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