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Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
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Posts: 329
Patrick wrote ...
ConKbot of Doom wrote ...
IIRC the F-16 crashes were due to polyimide/kapton insulation whch has creep/cold flow issues. I.E. harness sitting on a stress point, cold flow thinning the insulation, and chafing working the rest of the way though it.
Really? I thought it was chaffing, I know a passenger aircraft crashed on greenland/iceland or somewhere went down because Kapton could burn ( like a fuse in bugs bunny cartoons) from one end to the other. I know that since this passenger aircraft crashed, the FAA changed the rules so pure kapton could not be used, it had to be layered with teflon or polyimide or something.
ill look in to this.
Bit of digging turns up burning kapton in military planes along with commercial planes, and wire chafing too. Now that I think of it, kapton tape doesnt cold-flow that much, its teflon which flows a lot, so that could be a mistake. Finding articles almost as old as I am ;p
The military has had far worse problems with Kapton. Military aircraft take more abuse, and the wiring is crammed into smaller spaces, which increases the chances of chafing. The problems first cropped up at sea, in the harsh aircraft-carrier operations of the Navy. For planes, the stress of carrierdeck takeoffs and landings has a bump-and-grind effect, causing the Kapton to rub against clamps and sometimes crack or break. And the salt air tends to degrade Kapton, leading to arcing and flashovers.
Go figure, its easy to chafe through insulation .005" thick.
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Difference between wires
