2 Elevator Servos?

[HSTMatt at sbcglobal.net]

Thanks Troy & Tom,

I'm using the Hitech 5945's and have the programmer. Thanks for the info.

Matt

  ----- Original Message ----- 
  From: Troy Newman 
  To: discussion at nsrca.org 
  Sent: Friday, September 13, 2002 8:40 AM
  Subject: Re: 2 Elevator Servos?


  The Futaba 9Z is capable of "Ailevators"...you use the gear channel as the slave for the elevator....Look it up in the book its pretty easy....The 9C should have the same thing...haven't played with it too much only when trying to get guys going with the Crow features.....on the 9C....JR is much easier....It uses a simple on off function to activate it.

  Don't make up a Program mix to do it...you will get a lag time problem. Elevons will make the controls work when aileron is applied you don't want that you want Ailevators and turn off the aileron functions on the elevators....its all setup in the Futaba already for you...check out the book and think Ailevators


  The Futaba makes the elevators aileron #3 and aileron #4.....Then you set the aileron travel of these surfaces to zero and the elevator travel to 100%.....do all of your adjusting in ATV for the end points.....And make sure the linkages are all as square as possible......This means make the servo arm and the pushrod at 90 deg regardless of the angle to the servo case....This is done by using the subtrim to get the arm in the right spot then you adjust the mechanical to put the surface in the right spot. Then do the same thing for the horns make sure both sides are at the same angle......and make sure both sides the horns on the surfaces are at the same distance from the hinge line....

  Adjust ATV (for futaba) and Travel Volume (for JR).....to set the end points.....example right elevator servo 100%up 97% dn....left elevator servo 77% dn and 80% up......in this case the left servo is moving too much and you don't want a big differential in the radio because they will not track the same.....The left elevator control horn on the surface is too close to the hinge line...giving too much throw...so lengthen this mechanically....until the numbers are very close......


  Use a couple of 12-15" stick that are straight cloths pin them to the elevators and make a big "V" behind the rudder.....you can dial the elevators in watching the sticks track with each other......I use 1/4" basswood sticks and I can get them to track pretty close...not 100% perfect but within about a 1/8" everywhere...Some servos move a little faster at some points and a little slower at others.....Its a balancing act...Adjust travel in the radio then play with the linkage then reset the travel in the radio


  and on and on.....


  By the way digital servos are easier to setup that older std type servos....and use two servo that are brand new or at least the same amount of time in the same application.....Reason here the pots will wear differently and this will change the servos end points and speed....this will cause grief in getting them to track....


  Good Luck

  Troy
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