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  #11  
Old 03-19-2021, 07:53 AM
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BuckWynd BuckWynd is offline
 
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Quote:
Originally Posted by edclee View Post
One SHOULD be using crimp ferrules on those type connectors, not just putting bare wires into them. They are cheap and secure and have a plastic lead-in that prevents the cut end of the insulation from being a stress point.
Ed
That's a good idea, Ed -- perhaps the manufacturers of these devices should include them with their products, or at least mention them in the instructions. But they don't. In fact, they specifically say to insert bare wires into the connectors.
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  #12  
Old 03-19-2021, 07:55 AM
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BuckWynd BuckWynd is offline
 
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Quote:
Originally Posted by lr172 View Post
I agree that screw down type connectors are not the best method for use with vibration
You mean like electronic ignition modules and magnetos mounted directly on an engine? I agree completely!
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Last edited by BuckWynd : 03-19-2021 at 08:03 AM.
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  #13  
Old 03-19-2021, 08:00 AM
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Snowflake Snowflake is offline
 
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Quote:
Originally Posted by BuckWynd View Post
You mean like electronic ignition modules and magnetos mounted directly on an engine? I agree completely!
And yet... You don't hear of a lot of failures of those. Despite being on an engine.

The green Phoenix connectors (screw down type) are essentially crimp terminals, with the crimp being provided by a screw. Adequate torque on the screw = adequate crimp and adequate locking to prevent loosening under vibration.
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  #14  
Old 03-19-2021, 08:09 AM
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The fact is, these green Euro connectors are used in our aviation products because they are easy to install on a circuit board, they're cheap, and they're available. But just because we are used to seeing them does not make them suitable for our applications.

Once again, my posting here is not a request for these manufacturers to fix any issues I've had, but for designers to think long and hard before they design aviation products with the first components that come along.

It's also a reminder for builders to be VERY cautious when selecting products to put in their airplanes.
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Last edited by BuckWynd : 03-19-2021 at 08:16 AM.
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  #15  
Old 03-19-2021, 08:29 AM
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Did you provide any support for the wires close to the connectors? Or are the connectors themselves taking the load of supporting the wires?
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  #16  
Old 03-19-2021, 12:27 PM
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Quote:
Originally Posted by Mike S View Post
Did you provide any support for the wires close to the connectors? Or are the connectors themselves taking the load of supporting the wires?
Hi Mike,

Yes the wires were supported as well as they could be, mechanically. The fact is, you simply can't indefinitely vibrate a bare wire conductor that's mashed underneath a screw mounted directly to an aircraft engine, and have it last forever. I am thinking about adding some non-conducting "goop" type sealant over the connector to further stabilize the last inch of wire where it goes in.
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Last edited by BuckWynd : 03-19-2021 at 12:34 PM.
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  #17  
Old 03-19-2021, 04:40 PM
Desert Rat Desert Rat is offline
 
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Quote:
Originally Posted by edclee View Post
One SHOULD be using crimp ferrules on those type connectors, not just putting bare wires into them. They are cheap and secure and have a plastic lead-in that prevents the cut end of the insulation from being a stress point.
Ed
I'm shamelessly hijacking this, but what sort of ferrule are you talking about? I agree with the OP that these are less than ideal, and would happily upgrade the end if I could find something reasonable to use.
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  #18  
Old 03-19-2021, 05:07 PM
edclee edclee is offline
 
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Quote:
Originally Posted by Desert Rat View Post
I'm shamelessly hijacking this, but what sort of ferrule are you talking about? I agree with the OP that these are less than ideal, and would happily upgrade the end if I could find something reasonable to use.
If you have difficulty with the linkl go to Amazon and search for Wire Ferrules. They are used almost exclusively in Europe for exactly this reason.
Ed

I use a kit like this:
https://www.amazon.com/s?k=wire+ferr...as-iss-sm_2_12

Ed
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  #19  
Old 03-19-2021, 06:00 PM
Bevan Bevan is offline
 
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In my humble opinion, adding a crimped on ferrule simply adds another potential failure point and it is my understanding that the green style terminal strip is intended for use with stranded wire, not a solid pin.

A small service loop and strain relief very close to the connection is the ticket here.

At annual, check the tightness of the screws and condition of the wires. Since you have the service loop, you will be able to cut off the 1/4 inch of smashed wire, re-strip and reconnect if needed.

Bevan


Quote:
Originally Posted by edclee View Post
If you have difficulty with the linkl go to Amazon and search for Wire Ferrules. They are used almost exclusively in Europe for exactly this reason.
Ed

I use a kit like this:
https://www.amazon.com/s?k=wire+ferr...as-iss-sm_2_12

Ed
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  #20  
Old 03-19-2021, 06:13 PM
BillL BillL is offline
 
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Quote:
Originally Posted by Walt View Post
I hate Molex!
Ditto !
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