[SPAM] Re: [SPAM] Re: dual elevator servos

[Ed Alt]

Jerry:
You should be able to use function 22 and set up the tail for D/Elev (dual elevators).  Try it by using AUX 3 (channel 8) for the left elevator and the regular elevator channel for the right side.  If you need to, use func 11 to reverse the direction of travel for either channel as required.  Then, use code 15, the sub trim function to set both channels to zero and with your trims centered and get the servo arms as close to center as possible by adjusting their position on the output shaft.  Then go back to the sub trim function and get them each aligned exactly parallel to the hinge line.  After this, do the mechanical linkage adjustment to get the elevator halves centered.  Last step, use code 12 (travel adjust) to get the throws the same for each side.  After this is all done and working right, you can use code 14 (trace rate) to change the throws of both channels at the same time.  All your D/R and expos will work the same on both channels.

Now I'm not sure if this all is supported on the 8103 (probably is), and should be there for PCM 10.  All this gives you the functional equivilent of a Matchbox.  If for some reason the travel doesn't match well between center and end points, you could always revert to a standard multi-point mix and play with the in between points, but it should not be necessary in most cases.

Good luck!
Ed
  ----- Original Message ----- 
  From: jjvoth 
  To: discussion at nsrca.org 
  Sent: Sunday, May 15, 2005 12:17 AM
  Subject: Re: [SPAM] Re: dual elevator servos


  Thanks all for the info-very helpful.

  Jerry
    ----- Original Message ----- 
    From: Dan Curtis 
    To: discussion at nsrca.org 
    Sent: Saturday, May 14, 2005 11:10 PM
    Subject: Re: [SPAM] Re: dual elevator servos


    Jerry,

    You can do the duel channel mix with the 8103 just fine, I set one up for a guy not to long ago.It seems I used the elevator and spoiler channels. I have the full procedure for doing it somewhere around here.  I can find it and send it to you.

    Dan
      ----- Original Message ----- 
      From: jjvoth 
      To: discussion at nsrca.org 
      Sent: May 14, 2005 11:02 PM
      Subject: Re: [SPAM] Re: dual elevator servos


      I'll be using either a JR PCM 10 (old) or a JR 8103. When the stick is moved quickly on the 10, one servo lags. I havn't tried the 8103 and am not sure if it will work with dual elevator servos.

      Jerry
        ----- Original Message ----- 
        From: Ed Alt 
        To: discussion at nsrca.org 
        Sent: Saturday, May 14, 2005 10:50 PM
        Subject: [SPAM] Re: dual elevator servos


        Your best bet is using separate channels with a mix.  With a Y setup, you will deprive yourself of the fine tuning capability you will need to make the travels correct, unless you get lucky with a perfectly matched set of servos out of the box.  A Matchbox will work fine, but you're adding weight, cost and an extra point of failure, however unlikely it is that one will fail.  If you use a mix, not only can you duplicate the Matchbox capability, you can exceed it if you have a multi-point mix capability on your radio.  A Matchbox is good for center and end points and that's it.

        Ed
          ----- Original Message ----- 
          From: jjvoth 
          To: discussion at nsrca.org 
          Sent: Saturday, May 14, 2005 11:33 PM
          Subject: dual elevator servos


          I want to use dual elevator servos. Will a Y harness with a matchbox work or do I have to use two channels? The servos have to be about 1.2" in length. What is the best JR or Hitech servo to use?

          TIA

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