Tube-like objects on back of wing [Static Wicks, Static Dischargers]

Mick West

Administrator
Staff member


This photo of what looks like "nozzles" is currently being sharing on social media as supposed evidence of a secret spraying program using commercial jets (i.e. the "chemtrail" theory).
FB_IMG_1439006924672.jpg



However, these are just static discharge wicks, short sections of wire bolted to the wing that discharge any build up of static electricity. Without these wicks, static electricity can build up on the wing, and uncontrolled sparks can interfere with communications and navigation equipment.


The image that is being passed around has a very forced perspective. It look like the wicks go along the entire wing, but it's actually just a few feet towards the tip of the wing. The wicks are barely visible in most photo of a 747-8F, because the plane is so big, and the wicks are tiny.





From inside the plane they are barely visible, way out on the end of the wing.


This video shows the wicks in context, and gives you a better idea of their size.

Here's a patent for a static discharge wick. It's basically a piece of multi-strand steel cable, covered in plastic, less than half an inch thick.

http://www.google.com/patents/US3617805


There is actually one "nozzle" in the photo though, the fuel dump vent. Due to the force perspective it looks like it's in the middle of the wing, but it's actually near the end (with the wicks)


Heres the vent in action. Jets sometimes have to dump fuel when they have to return after takeoff (or land midway to their destination) due to some emergency.


And here's a shot of a fuel dump with the static wicks visible, giving a good sense of scale. This is on a 777.
 
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CeruleanBlu

Senior Member.
I found these small tube-like objects being discussed on a forum in 2009, this photo is what was being discussed.



I looked up static wicks and was led down a path of Boeing PDF files to find the supplier of the items in question, HR Smith (Technical Developments) Ltd., and a link to the product page.



They basically discharge built up static electricity that would otherwise damage the plane.

Hope that helps!

:)
 
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Trailspotter

Senior Member.
Smaller planes, like Airbus A320 have similar sticks on back of wing and winglets too:


From the wing tip end they look like this:
 
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Mick West

Administrator
Staff member
Thanks to @Fin for the original questions. I'm going to hijack the OP for a more detailed and useful explanation/debunking
 

TWCobra

Senior Member.
From the Airbus manuals. This shows where they are and how many can be missing or serviceable. Airbus call them "Static Dischargers".



static 2.png

static 1.png
 

Spectrar Ghost

Senior Member.
Not many things on an aircraft that you're allowed to lose 1/5th of.... Interesting, thanks.

Depends on the aircraft. Somewhere I have a schematic of what the A-10 was designed to fly without. It's... Enlightening.

Edit: Can't find it. Have a Wikipedia instead.

https://en.m.wikipedia.org/wiki/Fairchild_Republic_A-10_Thunderbolt_II
 
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