X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao02.cox.net ([68.230.241.37] verified) by logan.com (CommuniGate Pro SMTP 4.3.2) with ESMTP id 964043 for flyrotary@lancaironline.net; Thu, 26 May 2005 12:21:22 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.37; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao02.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050526162030.PTMW22430.fed1rmmtao02.cox.net@BigAl> for ; Thu, 26 May 2005 12:20:30 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: D-sub connectors - Prewired cables Date: Thu, 26 May 2005 09:20:32 -0700 Message-ID: <000001c5620e$d6fd35f0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C561D4.2A9E5DF0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C561D4.2A9E5DF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 One thing to consider is that with a canard pusher you can't get a = prewired harness installed easily because the plugs won't go down the electrical conduit. A harness could be installed during the fuselage construction, = but once the fuselage is built you either have to run the harness another = way, add a connector, or snip and resolder all the wires. =20 One easy solution is to use the gold plated, machined crimp-on d-sub = pins. Put all the pins on, but pull the wire bundle to where it goes before snapping the pins into the connector.=20 =20 After doing all my avionics and EFIS plugs with the gold plated crimp-on D-subs, I got to love them. Quick easy, and with the special D-sub = crimp tool; very secure connections. Snap them into the connector after making = and checking the crimp. =20 I'm recommending that Tracy go that route. Yeah, it takes a good tool = ($44 t Aeroelectric http://www.bandc.biz/cgi-bin/ez-catalog/cat_display.cgi?9X358218#RCT-3) = I believe in soldered connections for all critical leads that carry much current, but the risks involved in soldering those little solder-socket d-subs that are already in the connector - I don't think so.=20 =20 It is especially important on the EM2 P-1 connector because the TC 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 'mechanical' connection = anyway. I found I had to use additional acid to get the solder to wet out on = these wires - risk of corrosion in the future. If I were doing that one over, = I'd toss that connector and get a new one with the plated crimp-on pins. =20 Any seconds to that motion (Tracy needs a little more pressure; don't ya think :) =20 Al ------=_NextPart_000_0001_01C561D4.2A9E5DF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

One thing to consider is that with a canard pusher you can't get a = prewired

harness installed easily because the plugs won't go down the = electrical

conduit. A harness could be installed during the fuselage construction, = but

once the fuselage is built you either have to run the harness another = way,

add a connector, or snip and resolder all the wires.

 <= /font>

One easy = solution is to use the gold plated, machined crimp-on d-sub pins.  Put all the = pins on, but pull the wire bundle to where it goes before snapping the pins = into the connector.

 <= /font>

After doing = all my avionics and EFIS plugs with the gold plated crimp-on D-subs, I got to = love them.  Quick easy, and with the special D-sub crimp tool; very = secure connections. Snap them into the connector after making and checking the = crimp.

 <= /font>

I’m = recommending that Tracy go that route.  Yeah, it = takes a good tool ($44 t Aeroelectric http://www.bandc.biz/cgi-bin/ez-catalog/cat_display.cgi?9X358218#R= CT-3)  I believe in soldered connections for all critical leads that carry much = current, but the risks involved in soldering those little solder-socket d-subs = that are already in the connector – I don’t think so. =

 <= /font>

 It is = especially important on the EM2 P-1 connector because the TC 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 ‘mechanical’ connection anyway. I found I had to = use additional acid to get the solder to wet out on these wires – risk = of corrosion in the future. If I were doing that one over, I’d toss that = connector and get a new one with the plated crimp-on pins.

 <= /font>

Any seconds = to that motion (Tracy needs a little more pressure; = don’t ya think :)

 <= /font>

Al

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