Through Firewall Gound Terminal

[daleandee]

I had a piece of copper I was going to use, and that stuff is heavy! Aluminum has been good enough for me. Threads in aluminum can be sketchy so I use a nut on the back side.

I could easily use aluminum, and probably should. Afterall, if I used the airframe as ground it would obviously be aluminum.

Appreciate the comments. Helps to refine my project. And prevents tunnel vision.

Nicely done and the more you develope it the better it gets.

FWIW I bought a grounding block from B&C Specialities (forrest of tabs) with 24 connections on it and found out that I needed more than that. Of course I have an electrically dependent airplane but I never imagined I'd need that many connections ...

Dale
3.0 Corvair/Tailwheel

[BobDz]

I had a piece of copper I was going to use, and that stuff is heavy! Aluminum has been good enough for me. Threads in aluminum can be sketchy so I use a nut on the back side.

I could easily use aluminum, and probably should. Afterall, if I used the airframe as ground it would obviously be aluminum.

Appreciate the comments. Helps to refine my project. And prevents tunnel vision.

Nicely done and the more you develope it the better it gets.

FWIW I bought a grounding block from B&C Specialities (forrest of tabs) with 24 connections on it and found out that I needed more than that. Of course I have an electrically dependent airplane but I never imagined I'd need that many connections ...

Dale
3.0 Corvair/Tailwheel

Thanks Dale!

[Friesen5]

I did something similar almost 20 years ago. It’s providing a solid ground for my Sonex. I took a photo of it yesterday, so I’ll try to attach it.

Mervin Friesen
Sonex 122

[BobDz]

I did something similar almost 20 years ago. It’s providing a solid ground for my Sonex. I took a photo of it yesterday, so I’ll try to attach it.

Mervin Friesen
Sonex 122

That definitely is the lightest solution I have seen!

[BobDz]

The things I learn in the rabbit hole.

Looks like my next iteration should be a brass stud with an aluminum bar.

[Bryan Cotton]

Looks good Mervin!

Like Dale, I find that too many ends up being not enough. Two lugs per screw is really just a serving suggestion.

3/8 is massive. I wouldn't go bigger than #10, but I would support both ends with that design. Or mount it in the middle possibly.

[BobDz]

Looks good Mervin!

Like Dale, I find that too many ends up being not enough. Two lugs per screw is really just a serving suggestion.

3/8 is massive. I wouldn't go bigger than #10, but I would support both ends with that design. Or mount it in the middle possibly.

I originally used 3/8" because on the engine side of the firewall there will be two 2/0 cables attached and I have 2/0 x 3/8" lugs. I also have 2/0 × 5/16" lugs. So I will downsize to 5/16.

[BobDz]

But that brass angle does look tempting.

OR...

I will soon have a few scraps of 1/8 ×1 aluminum angle!!

This rabbit hole is getting deeper...

[Bryan Cotton]

As bad as steel looks on that list, consider that resistance/conductivity is also a function of cross section area and length. The length is very small, and the cross section area is large. It really won't matter what you select.

[Bryan Cotton]

I originally used 3/8" because on the engine side of the firewall there will be two 2/0 cables attached and I have 2/0 x 3/8" lugs. I also have 2/0 × 5/16" lugs. So I will downsize to 5/16.

2/0 is massive! The Aerovee manual specifies 6ga minimum and I think I used 4ga.