[R-390] Teflon

rbethman rbethman at comcast.net
Sat Feb 16 13:39:33 EST 2013


My perspective comes from aircraft industry and using wiring harnesses 
that are prefabricated on a large board that the wires are strung on 
PRIOR to applying to an airframe.

It is NOT pulled over an edge.  All openings are turned edges, not 
leaving a ragged edge.

Rather the same way that the airfoil shape, (Ribs), are made by holes 
that are intentionally radiused.  This is done to reduce fractures and 
allow for reduced stresses.

Applies from single engine aircraft to much larger commercial ones.

Wiring harnesses are well planned and laid out far in advance of 
installation.

Much Teflon wiring has been used in later production R-390As.  Yet no 
rubbing and creating insulation breakage.

Boeing 777 uses this methodology, not to mention newer Cessna 172s.

I'm not a Penguin, I do fly.

YMMV

Bob - N0DGN

On 2/16/2013 1:27 PM, n4xy wrote:
> THE problem with Teflon and Kapton is their cold-flow characteristic. 
> Pull a TFE or Kapton insulated wire against an edge (turning a corner) 
> and-over time-the insulation parts, allowing a short, and probably a 
> spark. Personally, I love TFE, have both mechanical & thermal wire 
> strippers for it, and use it exclusively. 'Course, I really watch out 
> about stretching it against edges, and I DON'T build aircraft!!!  LOL
>



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