elevator servo torque

[Grow Pattern]

elevator servo torqueDaniel,
            The impact has two elevator servos, one in each stab half, lying on their sides. The physical size of the opening in the stab halves may well dictate your choice of servo. I prefer 8411's but they are too big. I may have to go with one servo and head for a packet of creativity glue and a Sherline lathe (VBG)

Regards,

Eric.
  ----- Original Message ----- 
  From: Daniel J. Hamlett 
  To: discussion at nsrca.org 
  Sent: Saturday, January 08, 2005 2:24 PM
  Subject: Re: elevator servo torque


  If I am remembering correctly the Impact wants 130. oz" on the elv.  I am building a Revolution Pro and that number sticks out in my mind as what the plans called for on the elv.  You can check the composite arf web site.  They have the instruction manuals online, it will have the torque required, or at least recommended for each surface..  Check out the link below.

  http://www.composite-arf.com/ar/Product?511000

  You should find everything that you need here.

  Another option that I did with the Revolution.  Installed a DS3421SA in each elv half.  The servos weigh .92oz each. Still lighter than 1 DS8411SA.  Your control linkage will be shorter as well, less weight there and it will be stiffer.  Over all I found that to be the simplest I could make it.

  Good luck.

  Dan
    ----- Original Message ----- 
    From: David Lockhart 
    To: discussion at nsrca.org 
    Sent: Saturday, January 08, 2005 12:33 PM
    Subject: Re: elevator servo torque


    Wayne,

    The 9411sa would be fine.  Swapping the final output gear from metal to nylon with save almost a 1/2 oz total for 3 servos.

    Run an unregulated 5cell pack (~1oz more than a 4cell pack) and you will have about 20% more torque and speed.  Or, just bump up the output on your voltage regulator to 6.3v if going that route.

    Regards,

    Dave Lockhart, Team JR
    DaveL322 at comcast.net

      ----- Original Message ----- 
      From: Wayne at Bolly Props 
      To: discussion at nsrca.org 
      Sent: Saturday, January 08, 2005 11:06 AM
      Subject: elevator servo torque


      I'm trying to figure out the amount of torque required for my elevator servo (single, in a pull-pull system).  I'm doing an electric Impact and trying to save as much weight as I can.  I'm considering either the DS8411SA or the DS9411SA.  Not sure if the 82 oz/in of the 9411 will be enough?  Savings of .7oz (every little bit helps) times 2 aileron and one elevator servo makes it worth while.

      There used to be a site on the net that showed a way to calculate the required torque, however I can't find it.

      Any first hand experience or good theories welcome!

      Wayne P.

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