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Date: Thu, 26 May 2005 22:14:19 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] D-sub connectors - Prewired cables
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Al Gietzen wrote:

> One thing to consider is that with a canard pusher you can't get a=20
> prewired
>
> harness installed easily because the plugs won't go down the electrical=

>
> conduit. A harness could be installed during the fuselage=20
> construction, but
>
> once the fuselage is built you either have to run the harness another w=
ay,
>
> add a connector, or snip and resolder all the wires.
>
> One easy solution is to use the gold plated, machined crimp-on d-sub=20
> pins. Put all the pins on, but pull the wire bundle to where it goes=20
> before snapping the pins into the connector.
>
> After doing all my avionics and EFIS plugs with the gold plated=20
> crimp-on D-subs, I got to love them. Quick easy, and with the special=20
> D-sub crimp tool; very secure connections. Snap them into the=20
> connector after making and checking the crimp.
>
> I=92m recommending that Tracy go that route. Yeah, it takes a good tool=
=20
> ($44 t Aeroelectric=20
> http://www.bandc.biz/cgi-bin/ez-catalog/cat_display.cgi?9X358218#RCT-3)=
=20
> I believe in soldered connections for all critical leads that carry=20
> much current, but the risks involved in soldering those little=20
> solder-socket d-subs that are already in the connector =96 I don=92t th=
ink=20
> so.
>
> It is especially important on the EM2 P-1 connector because the TC=20
> wire does not solder well. Tinned copper works OK, but the TC wires do =

> not form a eutectic at the joint, and you only get a =91mechanical=92=20
> connection anyway. I found I had to use additional acid to get the=20
> solder to wet out on these wires =96 risk of corrosion in the future. I=
f=20
> I were doing that one over, I=92d toss that connector and get a new one=
=20
> with the plated crimp-on pins.
>
> Any seconds to that motion (Tracy needs a little more pressure; don=92t=
=20
> ya think :)
>
> Al
>
Please tell me that when you said 'acid' you really meant 'acid free=20
flux for electronic wiring '.

What kind of wire won't take solder well?

Charlie