X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.81] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1133090 for flyrotary@lancaironline.net; Tue, 30 May 2006 11:42:28 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.81; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 30 May 2006 08:41:42 -0700 Message-ID: Received: from 4.171.114.109 by BAY115-DAV9.phx.gbl with DAV; Tue, 30 May 2006 15:41:40 +0000 X-Originating-IP: [4.171.114.109] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Another case of heat-soaked coils? Date: Tue, 30 May 2006 11:41:34 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00AE_01C683DE.0106A970" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.20.0026.0800 Seal-Send-Time: Tue, 30 May 2006 11:41:34 -0400 X-OriginalArrivalTime: 30 May 2006 15:41:42.0683 (UTC) FILETIME=[8CAF36B0:01C683FF] This is a multi-part message in MIME format. ------=_NextPart_000_00AE_01C683DE.0106A970 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks, your welcome Al. Hope the guy that brought this to mind (John = Slade) heard it. I still don't know what kind of junction (connector, = butt splices, bullet connectors, etc) that he used but none of them = should be encapsulated in RTV for the reason given. That pungent smell = you get when dispensing RTV is acetic acid. =20 Two part rubber (like ProSeal and other polysulfide compounds) would = not have this problem even though they have a smell that is similar to = cat excrement : ). Still, there are better ways to do stress relief other than gooing the = wires together. =20 Tracy ----- Original Message -----=20 From: al p Wick=20 To: Rotary motors in aircraft=20 Sent: Sunday, May 28, 2006 9:24 PM Subject: [FlyRotary] Re: Another case of heat-soaked coils? Wow. Thanks for sharing that. Had never heard this warning. = Fortunately I've never used the RTV for stress relief, but I can see how = it would be so tempting. -al wick Artificial intelligence in cockpit, Cozy IV powered by stock Subaru = 2.5 N9032U 200+ hours on engine/airframe from Portland, Oregon Prop construct, Subaru install, Risk assessment, Glass panel design = info: = http://www.maddyhome.com/canardpages/pages/alwick/index.html On Sun, 28 May 2006 11:00:29 -0400 "Tracy Crook" = > writes: First, DON"T EVER attempt to stress relieve a wire junction bundle = with Silicone Rubber RTV! It cures with acetic acid which corrodes = electrical connections!!!! Stress relieving wires is potentially a long subject so I'll have to = reduce it to basic principle. In most cases, the concentrated stress = with soldered connectors is a red herring argument (having no basis). = Connectors generally have integral stress relief features built into the = backshell which prevent stress from vibration & cable movement from = reaching the point in the wire that has solder wicking into the strands. = I usually go one step further and put a piece of heat shrink sleeving = over the wire bundle where it leaves the connector. =20 There are innumerable other methods of stress relieving wires. = Adel clamps, wire lacing cord, and tie wraps are the most common. Just = keep vibration from causing wire to flop around - That's the whole basis = of stress relief in electrical work. ----- Original Message -----=20 From: Thomas y Reina Jakits=20 To: Rotary motors in aircraft=20 Sent: Saturday, May 27, 2006 3:36 PM Subject: [FlyRotary] Re: Another case of heat-soaked coils? Tracy, would you be so kind and elaborate on your way to do "stress = relief" on solder/wire/cable joints? Thanx TJ ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in = aircraft=20 Sent: Friday, May 26, 2006 9:41 PM Subject: [FlyRotary] Re: Another case of heat-soaked coils? Thought the coils were a long shot. I'm still not sure where the connection that failed was = (connector contact or the unknown connection at the end of the pigtail = left by cutting the connector off the Mazda harness) but I do like = treating all connector contacts with a corrosion inhibitor. My favorite = is Corrosion X. I like soldered connections for this reason too. I'll = do my own stress relief to get it away from the potential stiff = connection at the solder joint. To each his own though. Tracy (Granddaughter gone for the summer, Aahhhh.......... = : )=20 ----- Original Message -----=20 From: Thomas y Reina Jakits=20 To: Rotary motors in = aircraft=20 Sent: Friday, May 26, 2006 8:54 PM Subject: [FlyRotary] Re: Another case of heat-soaked coils? Get some SP-400! If you fancy it, mask the to be treated area - then aply a = thin coat (shake the can really well and repeat often...). Get over any all connectors that are suspect to moisture. It will form a thin wax like coat. Re-apply at least one more = time after a couple of hours or overnight. Areas that are really in the "wet" you should apply up to 5 = coats. It takes a while to do a good job, but: It is transparent - you alway see the connection The coat gets a little harder with time, but always stays = flexible It made my day on a Bell-47 for 3 month on the ocean!! TJ ----- Original Message -----=20 From: "John Slade" = > To: "Rotary motors in aircraft" = > Sent: Friday, May 26, 2006 11:31 AM Subject: [FlyRotary] Re: Another case of heat-soaked coils? > Well it wasn't the coils after all. > Florida humidity had gotten to one of my crank angle sensor = connectors. > Problem solved. > Coils returned. > $206 back in my pocket. > Life is good > John > > -- > Homepage: = http://www.flyrotary.com/ > Archive and UnSub: = http://mail.lancaironline.net/lists/flyrotary/ -- Homepage: = http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net/lists/flyrotary/ -al wick Artificial intelligence in cockpit, Cozy IV powered by stock Subaru = 2.5 N9032U 200+ hours on engine/airframe from Portland, Oregon Prop construct, Subaru install, Risk assessment, Glass panel design = info: http://www.maddyhome.com/canardpages/pages/alwick/index.html ------=_NextPart_000_00AE_01C683DE.0106A970 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Thanks, your welcome Al.  Hope the guy that brought this = to=20 mind (John Slade) heard it.  I still don't know what = kind of=20 junction (connector, butt splices, bullet connectors, etc) that he = used but=20 none of them should be encapsulated in RTV for the reason given.  = That=20 pungent smell you get when dispensing RTV is acetic = acid.  
 
Two part rubber  (like ProSeal and other polysulfide = compounds) would=20 not have this problem even though they have a smell that is similar to = cat=20 excrement : ).
Still, there are better ways to do stress relief other than gooing = the=20 wires together.  
 
Tracy
----- Original Message -----
From: al p Wick
To: Rotary motors in = aircraft
Sent: Sunday, May 28, 2006 9:24 = PM
Subject: [FlyRotary] Re: = Another case of=20 heat-soaked coils?

Wow. Thanks for sharing that. Had never heard this warning. = Fortunately=20 I've never used the RTV for stress relief, but I can see how it would = be so=20 tempting.
 

-al wick
Artificial intelligence in cockpit, Cozy IV = powered by=20 stock Subaru 2.5
N9032U 200+ hours on engine/airframe from = Portland,=20 Oregon
Prop construct, Subaru install, Risk assessment, Glass panel = design=20 info:
htt= p://www.maddyhome.com/canardpages/pages/alwick/index.html
 
On Sun, 28 May 2006 11:00:29 -0400 "Tracy Crook" <lors01@msn.com> writes:
First,  DON"T EVER attempt to stress relieve a = wire=20 junction bundle with Silicone Rubber RTV!  It cures with acetic = acid=20 which corrodes electrical connections!!!!
 
 
Stress relieving wires is potentially a long subject so = I'll have=20 to reduce it to basic principle.   In most cases, the = concentrated=20 stress with soldered connectors is a red herring argument (having no = basis).  Connectors generally have integral stress relief = features=20 built into the backshell which prevent stress from vibration & = cable=20 movement from reaching the point in the wire that has solder wicking = into=20 the strands.  I usually go one step further and put a piece of = heat=20 shrink sleeving over the wire bundle where it leaves the=20 connector.  
 
There are innumerable other methods of stress relieving=20 wires.   Adel clamps, wire lacing cord, and tie wraps = are the=20 most common.  Just keep vibration from causing wire to flop=20 around - That's the whole basis of stress relief in electrical=20 work.
----- Original Message ----- =
From: Thomas y Reina Jakits =
To: Rotary motors in = aircraft=20
Sent: Saturday, May 27, = 2006 3:36=20 PM
Subject: [FlyRotary] Re: = Another case=20 of heat-soaked coils?

Tracy,
 
would you be so kind and = elaborate on your=20 way to do "stress relief" on solder/wire/cable = joints?
 
Thanx TJ
----- Original Message ----- =
From:=20 Tracy=20 Crook
To: Rotary motors in = aircraft=20
Sent: Friday, May 26, = 2006 9:41=20 PM
Subject: [FlyRotary] Re: = Another=20 case of heat-soaked coils?

Thought the coils were a long shot.
 
I'm still not sure where the connection that failed was = (connector=20 contact or the unknown connection at the end of the pigtail left = by=20 cutting the connector off the Mazda harness) but I do like = treating all=20 connector contacts with a corrosion inhibitor.  My favorite = is=20 Corrosion X.   I like soldered connections for this = reason=20 too.  I'll do my own stress relief to get it away from the=20 potential stiff connection at the solder joint.  To each = his own=20 though.
 
Tracy  (Granddaughter gone for the=20 summer,     Aahhhh.......... : ) 
----- Original Message ----- =
From: Thomas y Reina = Jakits
To: Rotary motors in=20 aircraft
Sent: Friday, May 26, = 2006 8:54=20 PM
Subject: [FlyRotary] = Re: Another=20 case of heat-soaked coils?

Get some SP-400!

If you fancy it, mask = the to be=20 treated area - then aply a thin coat (shake
the can really = well and=20 repeat often...).
Get over any all connectors that are = suspect to=20 moisture.
It will form a thin wax like coat. Re-apply at = least one=20 more time after a
couple of hours or overnight.
Areas = that are=20 really in the "wet" you should apply up to 5 coats.
It = takes a=20 while to do a good job, but:
It is transparent - you alway = see the=20 connection
The coat gets a little harder with time, but = always=20 stays flexible

It made my day on a Bell-47 for 3 month = on the=20 ocean!!

TJ

----- Original Message ----- =
From: "John=20 Slade" <sladerj@bellsouth.net>
To= :=20 "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent:=20 Friday, May 26, 2006 11:31 AM
Subject: [FlyRotary] Re: = Another case=20 of heat-soaked coils?


> Well it wasn't the coils = after=20 all.
> Florida humidity had gotten to one of my crank = angle=20 sensor connectors.
> Problem solved.
> Coils=20 returned.
> $206 back in my pocket.
> Life is = good
>=20 John
>
> --
> Homepage:  http://www.flyrotary.com/
> = Archive and UnSub:   http://mail.lanca= ironline.net/lists/flyrotary/


--
Homepage: =20 http://www.flyrotary.com/
Archi= ve=20 and UnSub:   http://mail.lanca= ironline.net/lists/flyrotary/
 

-al wick
Artificial = intelligence in=20 cockpit, Cozy IV powered by stock Subaru 2.5
N9032U 200+ hours on=20 engine/airframe from Portland, Oregon
Prop construct, Subaru = install, Risk=20 assessment, Glass panel design=20 = info:
http://www.maddyhome.com/canardpages/pages/alwick/index.html
= ------=_NextPart_000_00AE_01C683DE.0106A970--