[NSRCA-discussion] Metal Servo Arms

[Bob Richards]

Earl,
   
  You are right about soft mounts. One thing I don't understand is why soft mounts have not made much progress in the larger 50cc+ size planes. 
   
  Bob R.
  

Earl Haury <ejhaury at comcast.net> wrote:
      Bob
   
  I agree - in reality servo arm / spline strength is pretty much of a mute point for pattern. I did the tests after a friend broke an 8411 shaft on a big gasser, and some heli friends claimed the Al arms stripped the spines from nylon servo shafts. Takes excessive force to do either. 
   
  Recall changing a clevis to a ball link on a Rossi carb arm - arm broke on the first flight, a doubled arm broke on the next - back to a clevis and never broke another. Vibratory forces aren't understood by most - but experience is a great teacher.
   
  Somewhere I've some DSA data gathered with mini-accelerometers mounted on aileron servo mounts, firewalls, etc. One look at those data with and without a soft mount will make one a believer in soft mounts!
   
  Earl
   
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