Waxy Lacing Thread?

[jsharkey]

What is the correct process for applying waxy lacing thread to wiring bundles? Three wraps and a reef knot seems to work.

Also can it be used Fire Wall Forward?

Jim Sharkey
RV6 - Wiring

[Jim P]

I'd have to dig it out, but I seem to remember aeroelectric.com had a document on how to tie these. You might also check AC 43.13B. It's basically a hitch with an overhand.

Here's Bob's link: http://aeroelectric.com/articles/cab...able_lace.html. I used Method 2 almost exclusively and it works well.

I also scoured 43.13B and couldn't find a reference that said NOT to use FWF. There were references against using zip ties, but not ties.

[RV10Pilot]

Try these shop notes from Aero Electric Bob
http://www.aeroelectric.com/articles...able_lace.html

And to quote "...Polyester flat-lace has excellent longevity characteristics under the cowl ..."

Larry

[RV6_flyer]

Originally Posted by Jim P

I'd have to dig it out, but I seem to remember aeroelectric.com had a document on how to tie these. You might also check AC 43.13B. It's basically a hitch with an overhand.

Here's Bob's link: http://aeroelectric.com/articles/cab...able_lace.html. I used Method 2 almost exclusively and it works well.

I also scoured 43.13B and couldn't find a reference that said NOT to use FWF. There were references against using zip ties, but not ties.

I used Bob's Method #1. It is right out of AC 43.13B. I have them forward of my firewall. They have held up well for the past 10+ years and 2,084 flying hours.

A little tip that I use with the WAXED lacing, after Bob's method one is completed with a square knot, I hit it with a heat gun to melt the wax and help hold the knot together.

I like the waxed best. I know others that do not like the waxed because they say it attracts more dirt. I have not noticed more dirt on my installation over the past 10+ years.

Remember that my advice may only be worth what you paid for it.

[Jim Percy]

I used the AC43.13 method which is a clove hitch secured with a square knot (same as Bob's method #1). Description of lacing and ties starts in part 11-158, the single tie is shown in figure 11-17. With a little practice it becomes quick and easy. I found the easiest way to REMOVE the tie (to add wires, reposition, etc) is to use flush cutters, perpendicular to the wires, to cut the knot off.

I used lacing tape everywhere, including under the cowl, and would do so again.

Hope this helps-
Jim

[Norman CYYJ]

Method number 3 is a poor choice even if it does look good to the judges. If you have to cut one loop the whole darn thing comes undone. This method was used quite often back in the days of tubes(valves). I have been using method 1 and 2 now for more years than I can remember.

[az_gila]

Some reference documents....

I think this is an FAA document, but comes courtesy of Australia...

http://casa.gov.au/rules/1998casr/021/021c99s2c08.pdf

...and for the real historians.. a link to a 1962 (but probably created in the 50's) US Navy "Workmanship and Design Practices for Electronic Equipment" harnessing document.

http://www.dairiki.org/hammond/cable-lacing-howto/

The "noose" type ends are no longer used, but this shows how harnesses can be laid out on a sheet of plywood and assembled.



It does look neater than ty-raps, and is quite easy to do after a little practise...

...and lastly, of course, the high-end NASA-acceptable tie knot...



Spot ties shall consist of a clove hitch, followed by a
square or other similar non-slip knot (i.e.: surgeon, etc.).



gil A

[Ironflight]

Originally Posted by az_gila

...and lastly, of course, the high-end NASA-acceptable tie knot...



Spot ties shall consist of a clove hitch, followed by a
square or other similar non-slip knot (i.e.: surgeon, etc.).

gil A

I, of course, use the NASA-approved method....

[alpinelakespilot2000]

Originally Posted by Jim P

I also scoured 43.13B and couldn't find a reference that said NOT to use FWF. There were references against using zip ties, but not ties.

Jim-
Were these 43.13 references just for using zip ties on FWF wire bundles or on wire bundles period? I'm assuming the former? Thanks.

[Jim P]

Steve, it was FWF.

Take a look at 43.13-1B, Chapter 11, Section 12, which outlines use of lacing and zip ties.