[NSRCA-discussion] 8611 on rudder

[Ed Alt]

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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