[NSRCA-discussion] Which servo?

[John Pavlick]

Georgie,
 You're just confused. A fast servo will respond immediately to the exponential curve. That's exactly what you want.  What you're doing with expo is de-sensitizing the servo near the center position, NOT slowing down its response. A "slow" servo will not respond quickly to flight loads (it won't hold it's position even if you're not moving the stick) and that's a bad thing. In any control system you want the most power with the fastest response (this is the goal - you have to tradeoff one for the other). If you think of expo as something that changes the "feel" or "sensitivity" to your inputs and not the "speed" at which things happen, maybe it will make more sense.

John Pavlick
  ----- Original Message ----- 
  From: george w. kennie 
  To: General pattern discussion 
  Sent: Sunday, June 01, 2008 4:21 PM
  Subject: Re: [NSRCA-discussion] Which servo?


  A light just went off for me .............( I think).   It occurred to me that we spend $130 for a servo with a .06 second transit time and then we program in 60 %  expo. Somehow this seems counter productive. I'm wondering if senility is rearing it's ugly head again.
  For some unexplainable reason this doesn't induce me to go out and buy slow servos. I know I'm going stark-raving mad !!!!!!!!!!!!!!!

  G.
    ----- Original Message ----- 
    From: kvelez at comcast.net 
    To: ron at inweld.com ; General pattern discussion 
    Sent: Saturday, May 31, 2008 11:16 PM
    Subject: Re: [NSRCA-discussion] Which servo?


    That is a good selection, I personally use those same servos but I like the DS8417 in the elevator, very good if you like a fast elevator servo.

    Ken

      -------------- Original message -------------- 
      From: "Ron Neeedham" <ron at inweldcorp.com> 

      Hi guys;



      I just purchased my first full sized used pattern plane.  After starting my radio installation, I found that the servos are in various states of wearing out.  I want to replace all servos on control surfaces.  From studying the JR list of servos, it looks like DS8411SA is a good choice for rudder and DS9411SA on elevator and ailerons.  Do you agree?



      I have been flying an Oxalys 50 and truly love that little plane but am anxious to try the real deal.



      Ron Needham





----------------------------------------------------------------------------


    _______________________________________________
    NSRCA-discussion mailing list
    NSRCA-discussion at lists.nsrca.org
    http://lists.nsrca.org/mailman/listinfo/nsrca-discussion


------------------------------------------------------------------------------
  I am using the free version of SPAMfighter for private users.
  It has removed 9041 spam emails to date.
  Paying users do not have this message in their emails.
  Try SPAMfighter for free now!



------------------------------------------------------------------------------


  _______________________________________________
  NSRCA-discussion mailing list
  NSRCA-discussion at lists.nsrca.org
  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20080601/61e81e6e/attachment.html