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 -----

From: Thomas y Reina Jakits

To: Rotary motors in aircraft

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 -----

From: Tracy Crook

To: Rotary motors in aircraft

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 -----

From: Thomas y Reina Jakits

To: Rotary motors in aircraft

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/


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