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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.
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.
Tracy
----- Original Message -----
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.
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
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.
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 -----
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 -----
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.......... : )
----- Original Message -----
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 -----
From: "John
Slade" <sladerj@bellsouth.net>
To:
"Rotary motors in aircraft" <flyrotary@lancaironline.net>
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:
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