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  #1  
Old 03-08-2023, 05:04 PM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Colorado Springs, CO
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Default Aft battery ground lug

I've got the fuse together but didn’t prep a ground lug hole for an aft battery in the left longeron which is nicely primed. I can remove primer but I’m wondering about trying to drill a big hole so close to the skin.

I saw a pic of a bar riveted to the longeron with the bolt hole in the bar. This seems structurally better.

Any thoughts on how many AD4 rivets would carry the start current adequately? Was thinking four or 5 on a short 1/8 bar having a ground bolt tab would get the job done without stripping primer with easier drilling to maintain edge distance on the longeron. Squeezing the rivets would make a good electrical connection in the holes. I wouldn’t prime the short bar.

Suggestions?
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  #2  
Old 03-08-2023, 05:55 PM
Norman CYYJ Norman CYYJ is offline
 
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I highly recommend that you clean the primer off of the aluminum.
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  #3  
Old 03-08-2023, 06:09 PM
JDA_BTR JDA_BTR is offline
 
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Thanks. But I also donít want to drill a big hole in the longeron.
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  #4  
Old 03-08-2023, 06:33 PM
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PaulvS PaulvS is offline
 
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I think Norman means to clean the paint off that part of the longeron where the un-primed bar is riveted on. That is what I would do and not rely on just the rivets to carry all those amps.
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  #5  
Old 03-08-2023, 06:59 PM
JDA_BTR JDA_BTR is offline
 
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I agree. Iím still curious about the rivets and the current. And what the connecting bar might look like. I thought I saw a picture somewhere but canít find it at the moment.
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  #6  
Old 03-08-2023, 07:06 PM
Mikeyb Mikeyb is offline
 
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Default Maybe this one?

https://vansairforce.net/community/a...8&d=1677667727

Courtesy of RYOUNG
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Last edited by Mikeyb : 03-08-2023 at 07:09 PM.
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  #7  
Old 03-08-2023, 07:18 PM
JDA_BTR JDA_BTR is offline
 
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Yes thatís it. How long do you think it is? 3 inches?
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  #8  
Old 03-08-2023, 07:22 PM
JDA_BTR JDA_BTR is offline
 
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Was also thinking a nutplate to retain the bolt would be helpful.
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  #9  
Old 03-09-2023, 06:44 AM
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RYOUNG RYOUNG is offline
 
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I patterned the ground lug from others I had seen surfing the web. Itís made from 1/8 inch aluminum and is 3 3/4 inch long and 5/8 inch wide with 7/8 inch wide bolt attachment lug. I used five AD4 rivets spaced approximately 3/4 inch to attach to the longeron. For corrosion protection, I dipped it in alodine. Hope this helps.
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  #10  
Old 03-09-2023, 07:10 AM
JDA_BTR JDA_BTR is offline
 
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Excellent info thanks!
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