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I'm familiar with the problem of the imbedded wire in aero duct wearing
into engine mount tubing and other things.
There are several ways to deal with it:
Separate the duct and the adjacent structure with cushion clamps. This is a
bit cumbersom but effective.
In areas of limited space clean the duct surface with MEK and apply a one
eighth to one quarter inch thick blob of high temperature silicone to the
duct. I've used this successfully. If straight silicone is insufficient due
it's inherent softness and limited abrasion resistance you can take a piece
of silicone baffle material and bond it to the duct with high temperature
silicone. Silicone baffle material with a fabric core is preferred.
With respect to cable wraps (aka Ty-Wraps), they were never designed to act
as stand-offs and in most cases don't do a very good job for that purpose.
Most cable wraps are temperature limited to about 185F. You can however buy
Tefzel (not to be confused with Teflon) cable ties that are good to about
300F. They are not inexpensive.
A handy material that works well to replace both cushion clamps or tie
wraps is Koroseal lacing. It is available from Aircraft Spruce. It requires
a bit of skill to use it effectively. The typical method is to wrap loosely
about three times around the two items you are trying to separate then wrap
tightly around the wraps you just made (at a 90 degree angle) several times
and finish with one or preferably two square knots. I'd recommend buying at
10 or 20 feet at a time.
http://www.aircraftspruce.com/catalog/elpages/lacing.php
KOROSEAL LACING - P/N 11-12200 $0.380 per foot.
Excellent lacing material. Permanently flexible. Resists oxidation,
impervious to petroleum products. Holds tension on knots indefinitely.
Perfect for holding wire bundles, tubing, etc. Rectangular cross-section
3/32" x 5/32".
Ted Stanley - A&P-IA
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LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.
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