[ARC5] Testing battleship radios

[Michael A. Bittner]

I believe I started this whole tangent on a tangent of a thread by naming the specific shock test used for military electronic equipment, namely MIL-S-901.  Plenty of info available on the net.   Mike, W6MAB

----- Original Message ----- 
  From: J. Forster 
  To: kgordon2006 at frontier.com 
  Cc: arc5 at mailman.qth.net 
  Sent: Saturday, November 03, 2012 9:48 AM
  Subject: Re: [ARC5] Testing battleship radios


  There are standard shock tests pretty much like that. They are done on a
  stand, composed of a platform on vertical steel rode with linear bearings,
  like Thomson Ball Bushings.

  The gear is bolted to the platform, the platform raised a few feet and
  held by a magnet or fast-acting latch. The gear is often instrumented with
  piezoelectric accelerometers.

  The test is done by starting the recorders and relesing the platform. When
  the platform hits a somewhat compliant pad underneath the platform, the
  gear is subjected to a known, repeatable shock pulse.

  It is very scary to see one of your instruments subject to this treatment,
  but it is required for aero-space hardware.

  Best,

  -John

  ==================





  > On 3 Nov 2012 at 8:28, Robert  Eleazer wrote:
  >
  >> One of my high school teachers, an early 1930's graduate of the Naval
  >> Academy, described testing radios intended for use on WWII Navy ships.
  >>
  >> They tested the radio to ensure it was up to spec, then hung it from a
  >> long rope, pulled it back, and let it slam into a steel wall.  Then
  >> they took it down and tested it again.  It not only still had to work;
  >> if it had shifted frequency by more than 1 KC it failed.
  >
  > Well, I dunno about that particular test, but I DO know that Grumman would
  > drop-test their airplanes to test the strength of their landing gear.
  >
  > The Hellcat was finally hauled to the top of the factory ceiling, about 30
  > feet
  > as I recall it, and dropped. No damage occurred.
  >
  > I don't know if it had all its radio gear installed at the time.
  >
  > Ken W7EKB
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