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ThunderPigC130

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 #1 
Hello Everyone

  I live near nellis AFB, and they lost a LOT of F100's thru the years.  I have been to many F100 sites, and a common part i find are springs ... But they are made out of braided cables (A few pics attached).

  I have never seen a spring made of braided cable before in all my years of working on cars, motorcycles, or at any other type of crash site.  Does anyone have any idea what they are and what they are used for?

Thanks !

Attached Images
Click image for larger version - Name: 100_6000.JPG, Views: 40, Size: 963.99 KB  Click image for larger version - Name: 100_6001.JPG, Views: 43, Size: 856.06 KB  Click image for larger version - Name: 100_6002.JPG, Views: 36, Size: 638.50 KB 

WaltW

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 #2 
I haven't seen that type but I have seen braided cable used as springs before.  Usually as avionics rack mounts or other component vibration isolators.

http://www.springcompany.com/products/vibration-isolators
ThunderPigC130

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 #3 
  So its not really a spring per se, its a vibration isolator.

  Thanks walt !
WaltW

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 #4 
Not necessarily.  It could still be a some form of wound spring just I haven't seen a linear spring wound of multiple strands.  Also I don't recall ever seeing an isolator that long in an aircraft application.
ChrisBaird

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 #5 
Possibly recoil buffer springs from the cannons?

I can't find a schematic for the M39. Attached pics are for the MK108 (30mm) which appears to have braided springs, not sure. The other pic is an Oerlikon 20mm I think..

Added Note:

Stranded (braided) wire (recoil) springs are especially suited to repetitive impact loading conditions. They are frequently used when impact stresses and velocities are so high that a single wire spring would not provide a long life cycle. Stranded wire consists of three to seven strands of wire that are machine-twisted or woven around each other, or around one wire that serves as a core, to form a single strand.

http://www.ctspring.com/press/2012/03/stranded-and-shaped-wire-springs

Chris B.

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ChrisBaird

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 #6 
I can't tell how big they are from your pictures.
Did the gun mounts have shock absorbers on them?

Chris B.
ChrisBaird

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 #7 
You can see the braided springs in this photo:

http://svsm.org/gallery/m39/IMG_4508

Chris B.
phixer

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 #8 
I worked on the F-100 for a few years and don't recall seeing springs like that on anything but we never took any of the components apart.  My first thought was the guns as well.  On ours the guns had been removed.
ThunderPigC130

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 #9 
  Chris:  You nailed it man, thats it!!  They are springs from the cannons.  If you look at the first pic i posted you can see part of the rod is still in there.

  For years i have found those things and always wondered what they were.  Now i know !

  Much appreciated to you and walt and phixer as well.

Steve
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