Tonight's Dumb Idea...

[JOddino]

Earl,
I know what you mean about retirement.  Not only do I miss access to neat equipment, but also the people.  We had experts on everything you could think of at Hughes.  We had guys with PhDs who taught vibration courses at UCLA.  At one point we even had a bearing lab because bearings were so important in missile seeker heads.   I bent a lot of guys ears with model airplane questions and learned a lot of stuff it would have been hard to find in books.  Luckily we have the internet now and it is getting better all the time.
Jim 
  ----- Original Message ----- 
  From: EHaury at aol.com 
  To: discussion at nsrca.org 
  Sent: Thursday, February 19, 2004 9:20 AM
  Subject: Re: Tonight's Dumb Idea...


  Jim

  One of the downsides to retirement is lack of access to neat equipment for analyzing our toy airplanes. I don't recall the spectrum in the aforementioned measurements, except that high amplitudes were at pretty low freqs, so Jerry may be correct. 

  After experiencing high servo current draw with an engine upgrade (4s) on a popular mount, I measured vibes with an accelerometer mounted to the aileron servo rails in a couple of different planes (geometric). Scary amounts of shaking going on there, installed one of Merle's mounts and things quieted down. I didn't see much need to continue measurements after the mount switch. I agree that there won't be much need with electrics either, but there may be insidious things pop up from the high rpm of the motor / gear train that will buzz something that we use.

  Earl
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