Ebay deals aren't always good
Tor
Posts: 2,010
So, here we have a magic item: https://www.ebay.com/itm/112055835359
A strap-less antistatic wristband. A deal I don't recommend, even for $0.99.
A strap-less antistatic wristband. A deal I don't recommend, even for $0.99.
Comments
I guess if the static build up is high enough at some point the discharge is wireless !
This item brings that sign to mind:
In this office we obey the laws of physics!
My favorite example of an expensive resistor is linked below. I wonder if bolting a few of these to your body would make a measurable difference.
https://m.aircraftspruce.com/catalog/elpages/staticdischargers.php
Polonium is used in anti-static brushes because it emits positively charged particles (mostly alpha particles). They're supposed to be safe as long as you don't eat it.
https://www.ebay.com/itm/5pcs-Cordless-Wireless-Anti-Static-ESD-Discharge-Cable-Band-Wrist-Strap-Slim/371740776858
Really? These are essential to change the electrical shape of the aircraft - in fact, to the point that for a commercial aircraft, it won't be allowed to fly if more than two are missing. Without them, HF comms are affected.
I used to have a couple of carbon-fibre static-dischargers in my desk drawer. They had been on a very large commercial aircraft for several years and were as sharp as a needle, having lost material a few electrons at a time.
They are not like the rubber conductors or lengths of chains people hang from the bumpers of cars - they really help to discharge the static that builds-up when a metal object passes through air at high speed.
Electric charge loves to jump off the most pointy parts of whatever object it is on.
Even if that means just jumping off into the atmosphere.
Don't they teach this simple physics in school anymore ?
Really. I have some too. The acceptable number probably is on a CDL and varies by aircraft, unless you know of a FAR you'd like to share. I find the grounding straps going bad a lot quicker than the wicks.
@Heater
If it were taught in high school I wouldn't remember. In flight school they taught us static will try to discharge from antennas because they're pointy. Dischargers are both pointy and have a lower corona voltage. I mentioned "measurable" because I think it would bleed off some static but probably not as fast as one could build it up, or discharge it into whatever they touch.
Composite aircraft are a little scary in this regard. There's a famous story about a glider getting struck by lighting and exploding. They ended up jumping out and pulling chutes.
Maybe I should mailbag some to EEVBlog he has all the test equipment.
Or what about a Wimshurst Machine?
The glider story is amazing. Back in 1990 something a guy I was working with a glider pilot. He took us up for a spin. A winch launch is pretty dramatic. No parachutes anywhere!
I had an argument with [a certain aircraft manufacturer] about their 'ten fitted: ten required' requirement in the MMEL/CDL. I seem to remember the (grudging) result being that the aircraft could depart if one was U/S.
Sounds like the short version of 'it depends'. It it were more than 1 they would need to break it down by the surface it were attached to. Missing 2 on one surface is surely worse than missing 1 on two surfaces. I think.
177 sold?
Are they going to charge you return shipping?