Today's Message Index:
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1. 05:39 AM - Re: AC tug (rd2)
2. 07:39 PM - Re: Milspec wire followup: PTFE vs ETFE (Bob Kuc)
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I found a used mobility scooter for $200.00, works well
Very easy to convert and I have old batteries and the charge lasts a long time
-->From: skywagon185guy <skywagon185@gmail.com>
Subject: Re: AeroElectric-List: AC tug
Many times you can find those used small garden riding mowers for sale cheap. Throw
the defunct mower section away, and tape up the cracked seat cushion and
you might have a winner.
Message 2
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| Subject: | Re: Milspec wire followup: PTFE vs ETFE |
I was building a plastic plane. At sun-n-fun I while back ago, I bought
wire from aren't vendor. It was labeled 20-3 uninsulated and was bundle in
100 ft rolls. Now I am building an rv7a and have some left over. Is there
a way to tell if the wire I have is ok for use in airplane? Coating on
wire is smooth and shiny and wire looks to be coated. Should I run.p and
get fresh wire from spruce?
Thanks
Another Bob K.
On Thu, Mar 11, 2021, 11:59 PM Charlie England <ceengland7@gmail.com> wrote
:
>
>
> On Thu, Mar 11, 2021 at 10:48 AM Robert L. Nuckolls, III <
> nuckolls.bob@aeroelectric.com> wrote:
>
>> At 11:22 AM 3/10/2021, you wrote:
>>
>> Question for Bob N. or others who've used a lot of milspec wire:
>> I'm aware of the obvious differences between PTFE & ETFE; 'P' has higher
>> temp rating but tends to 'cold flow'. I
>>
>> I'm pretty sure I've encountered PTFE in pre-built harnesses from some
>> avionics mfgrs,=C3=82 based on the way the insulation strips,=C3=82 vs k
nown-ETFE
>> wire I have on hand. If we install with reasonable care, is there any
>> reason to fear using PTFE for wiring throughout the airframe?
>>
>>
>> PTFE (Teflon) is not 'more' desirable than ETFE (Tefzel) and
>> it has some downsides.
>>
>> Greg Richter and I had some lengthy discussions on this
>> about 17 years back after I reviewed his "Wiring for Smart People"
>> publication.
>>
>> https://tinyurl.com/qxvr6nx
>>
>> I'm aware of no manufacturer that uses Teflon
>> for general airframe wiring. Of perhaps 30000
>> feet of wire I have in inventory, I don't think
>> there is a hundred feet of Teflon.
>>
>> Here's a copy of the Wire Bible which was
>> updated on the website this morning. This is
>> a searchable pdf file that will allow you to
>> quickly identify about any wire product by
>> specification.
>>
>> https://tinyurl.com/ydgacclw
>>
>> Having said that, Teflon is not 'evil'. If you
>> got a heck of a deal on some I would not discourage
>> it's use in avionics harnesses but it's kinda
>> finicky to strip.
>>
>> https://tinyurl.com/bol9x2n
>>
>>
>>
>>
>> Bob . . .
>>
> I'd agree that P is less desirable than E, because I'm not concerned abou
t
> extreme temp ratings and had minor concern about cold flow. I had spotted
a
> 'deal' on about 1K ft of P (IIRC, it was ID'd as M22759/9), but then foun
d
> the same quantity of E (M22759/16) for about a penny more per foot. Not a
> big enough price delta for the hassle.
>
> Many thanks for the info; if I run across some P with a bigger price delt
a
> in the future, I may well add some to my 'inventory'.
>
> Charlie
>
>
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