[NSRCA-discussion] 8611 on rudder

[Earl Haury]

Ed

Good points, but no extensions involved. The 84/86 were fine with the 9Z, but the 86 didn't like the 14MZ. Used / new 86's behaved the same in a couple of different airplanes. Likewise, the 84's were fine in various airplanes with the 14 (as are the Futaba servos mentioned).

Earl
  ----- Original Message ----- 
  From: Ed Alt 
  To: General pattern discussion 
  Sent: Friday, January 09, 2009 9:06 AM
  Subject: Re: [NSRCA-discussion] 8611 on rudder


  Earl:
  A possible cause for 8611 oscillation could also be wire gauge if on a long extension.  It's got a more aggressive current pulse than the 8411 and that could be enough to set off an oscillation if the wires are a little on the light side, or if there is a bad connector crimp - anything that might be driving up connection resistance could be a factor. If already using 22 AWG, disregard my comment.  It would be interesting to know what the 14MZ refresh rate is though.

  Ed
    ----- Original Message ----- 
    From: Earl Haury 
    To: General pattern discussion 
    Sent: Friday, January 09, 2009 9:56 AM
    Subject: Re: [NSRCA-discussion] 8611 on rudder


    I agree with Dave. Also, the 8411 works fine with the 14MZ whereas the 8611 is prone to oscillation (suspect a mismatch with the 14MZ refresh rate). 

     OTOH, the 9155, BLS351, & 9156 (in order of power) Futaba servos all work well on the rudder @ 6v. I've  also noted a different "feel" with the brushless servos that, I suspect, is a result of motor rotor mass. While the total transit time of a brushless & coreless servo may be the same, the brushless seems to start slower which seems to result in a bit smoother feel. I also don't see any benefit to torque above 200 oz - in, but this may vary with airplane design.

    Earl
      ----- Original Message ----- 
      From: Dave 
      To: 'General pattern discussion' 
      Sent: Friday, January 09, 2009 8:09 AM
      Subject: Re: [NSRCA-discussion] 8611 on rudder


      I prefer the lighter weight, tighter geartrain, and more aggressive center of the 8411sa.  I've not found the added torque of the 8611 necessary.

       

      If oscillation is a problem with the 8411sa, the 8611 may fix this - but the center will not be as aggressive (but it may not be a big enough difference to notice depending on the specific plane and specific linkage system).

       

      Regards,

       

      Dave

       


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      From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ed Alt
      Sent: Friday, January 09, 2009 2:45 AM
      To: nsrca-discussion at lists.nsrca.org
      Subject: [NSRCA-discussion] 8611 on rudder

       

      I'm interested in feedback from those who are using the 8611 or 8611A on a 2M rudder.  Is that extra torque as compared to an 8411 class servo really buying you anything? I'm always reluctant to go to a metal gear servo, although the 8611 is pretty low on slop as MG servos go.

       

      Thanks

      Ed



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