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-   -   Woops! (https://forums.macnn.com/showthread.php?t=527481)

 
subego Jan 31, 2018 03:53 PM
Woops!
Surprisingly, no death or injury.

https://i.imgur.com/QpAwebB.gif

(More woops to come)
 
Chongo Jan 31, 2018 04:15 PM
More oops 11-8 videos on youtube
 
subego Jan 31, 2018 04:25 PM
A classic!

There’s one which usually follows it around about an impossible to see speed bump. I try and dig it up.
 
subego Jan 31, 2018 04:28 PM


 
subego Feb 2, 2018 03:13 PM
https://i.imgur.com/RYv170X.gif

Analysis is they accidentally hit the (pedal activated) emergency brake.
 
subego Feb 2, 2018 03:50 PM
A woops to be

https://imgur.com/7lCrlUf.jpg

Am I doing the math right? That looks about 13 million watts.
 
reader50 Feb 2, 2018 06:36 PM
Max amps would be a dead short, at 0 ohms load. Their numbers suggest a line resistance of .02 ohm.

If you assume 1 ohm for the person in circuit (wet hands and standing in water) with .02 ohm line resistance, you'd get maybe 460 amps at 470 volts. Amps would go up rapidly as your skin resistance failed further, while voltage would drop more slowly.

The label is misused. 480 VAC is medium voltage according to the NEC, and personal protective equipment (PPE) absolutely works with 480. Electrical tape would be enough. Dry gloves, rubber gloves, even bare hands if you're wearing dry shoes (and only touch one leg) would work. I'd expect that label at several KVAC or higher.
 
subego Feb 2, 2018 10:41 PM
IIUC, the warning is because of the heat an arc fault would release. Second degree burns at 30 feet.

I gather there actually is PPE which can handle what would be encountered at working range, but it won’t handle the accompanying getting blown across the room.
 
subego Feb 3, 2018 02:12 AM
 
ghporter Feb 4, 2018 07:05 PM
Quote, Originally Posted by reader50 (Post 4395866)
Max amps would be a dead short, at 0 ohms load. Their numbers suggest a line resistance of .02 ohm.

If you assume 1 ohm for the person in circuit (wet hands and standing in water) with .02 ohm line resistance, you'd get maybe 460 amps at 470 volts. Amps would go up rapidly as your skin resistance failed further, while voltage would drop more slowly.

The label is misused. 480 VAC is medium voltage according to the NEC, and personal protective equipment (PPE) absolutely works with 480. Electrical tape would be enough. Dry gloves, rubber gloves, even bare hands if you're wearing dry shoes (and only touch one leg) would work. I'd expect that label at several KVAC or higher.
In my experience the use of signage around dangerous electrical systems tends to be as (excuse the pun) inflammatory as possible. It either gets your attention or it's useless. Having felt what 1200 watts going through your finger tip is like (not fun at all!) from an accidental contact inside something called a "cold compartment" - without signage - I get the point.
 
subego Feb 4, 2018 09:33 PM
In a similar vein, I have high explosives warning labels I put on boxes of spare bulbs to incline people to be gentle.
 
subego Feb 9, 2018 01:08 PM
 
andi*pandi Feb 9, 2018 01:39 PM
just like mario kart.
 
subego Feb 12, 2018 02:11 AM
 
subego Feb 23, 2018 10:25 PM
 
OAW Feb 24, 2018 12:41 PM
^^^

:lol:

OAW
 
subego Mar 1, 2018 01:01 PM
 
subego Mar 4, 2018 07:16 AM
 
Laminar Mar 5, 2018 02:37 PM
Probably not the seat you want to be kicking.
 
turtle777 Mar 5, 2018 10:52 PM
Thanks for explaining the joke, Cpt. Obvious. LOL :p

-t
 
subego Mar 12, 2018 02:43 PM
 
reader50 Mar 12, 2018 03:33 PM
I would have used a straight ladder. They wouldn't need 6 guys, just one to fetch the ladder.

There aren't many swimming pools without steps. Must be a custom backyard pool.
 
subego Mar 12, 2018 03:42 PM
It seems that way.

The theoretical explanation is both the kid clonked his head pretty hard falling in, and everything is covered in ice.

The first makes me think one of the firemen would go down, check him over, and help push him up.

The second makes me think “he’s supposed to maintain grip on the ice with his shoes vertically?”
 
andi*pandi Mar 12, 2018 03:51 PM
they could throw him a skateboard with the rope.
 
subego Mar 12, 2018 04:14 PM
Quote, Originally Posted by andi*pandi (Post 4397166)
they could throw him a skateboard with the rope.
I imagine this is a joke, but if you’re going to haul him up with his back up against the slope, which is what makes sense to me, taping a skateboard to his back isn’t the worst idea.
 
Spheric Harlot Mar 12, 2018 04:37 PM
Quote, Originally Posted by reader50 (Post 4397164)
I would have used a straight ladder. They wouldn't need 6 guys, just one to fetch the ladder.

There aren't many swimming pools without steps. Must be a custom backyard pool.
That's not a swimming pool. That's a skatepark.
 
andi*pandi Mar 12, 2018 04:42 PM
<vindication>
 
turtle777 Mar 12, 2018 05:26 PM
Quote, Originally Posted by Spheric Harlot (Post 4397171)
That's not a swimming pool. That's a skatepark.
That’s only until you fill it with water :-p

-t
 
subego Mar 15, 2018 12:53 PM
 
ghporter Mar 15, 2018 05:41 PM
That there is called a “flat spin.” Being that close to the ground, and that slow, just made it more entertaining. But it is certainly “oops worthy.”

“Uh, colonel. About that nice airplane you trusted me with. Well there was this little problem, and...oops.” I would not want to be that pilot, even if he did everything 100% right.
 
subego Mar 15, 2018 06:53 PM
IIUC (which appropriately in this situation, autocorrect wants to change to “ouch”) an engine went out due to mechanical failure, which would have been recoverable if he had more altitude.
 
reader50 Mar 15, 2018 07:16 PM
He tried hard to recover. The stopwatch says he hit the eject 1.9 seconds before impact.
 
subego Mar 15, 2018 07:32 PM
Impressive he could eject sideways so close to the ground and land in one piece.
 
ghporter Mar 16, 2018 11:47 AM
Quote, Originally Posted by subego (Post 4397313)
Impressive he could eject sideways so close to the ground and land in one piece.
It looks like the pilot initiated the ejection only after he was confident the aircraft was going down in the infield and not on a runway (or in a crowd). I still wouldn't want to be him, but I have to take my hat off to him.

Modern fighters feature what's called a "zero/zero" ejection seat. The name refers to zero altitude, zero speed, and indicates that the seat will work correctly even if it is actuated sitting still on the tarmac.

The sideways nature of that ejection is certainly remarkable. but notice that you can see the seat's rocket motors orient the pilot more vertically and then get him going straight up. This is how it actually saved his life.

The seats in the FA-18 are called the Mk 14 NACES (Navy Aircrew Common Ejection Seat), built by Martin-Baker and are of the latest generation of zero/zero seats in US operation. USAF uses ACES (Advanced Concept Ejection Seat) models, made by United Technologies (originally developed by McDonell-Douglas); currently the F-16, A-10 and F-22, along with both the B1 and B2 use the ACES II seat.

Wiki says that the minimum altitude for an ACES II seat to work INVERTED is 140 feet at a speed of 150 knots. (let that sink in...at 140 feet, the seat will get you out from under the airplane and then to an altitude that the parachute will save your life. I can't find any specifics for the seat in an FA-18, but I'll bet they're very similar.

A very spectacular whoops, but fascinating for all the tech that went into saving lives - both the pilot's and anyone else's around the incident.
 
Spheric Harlot Mar 16, 2018 12:26 PM
Quote, Originally Posted by ghporter (Post 4397306)
That there is called a “flat spin.” Being that close to the ground, and that slow, just made it more entertaining. But it is certainly “oops worthy.”

“Uh, colonel. About that nice airplane you trusted me with. Well there was this little problem, and...oops.” I would not want to be that pilot, even if he did everything 100% right.
Apart from the fact that he came down hard on that tarmac.
 
ghporter Mar 16, 2018 02:38 PM
I found some background on that crash. It was a Canadian CF-18, and the pilot was practicing for an airshow in Alberta. From The Globe and Mail (Toronto):
Quote
The jet, flown by Captain Brian Bews, lost thrust in its right engine while doing a manoeuvre about 90 metres above the ground at the Lethbridge County Airport in July, 2010
Here’s a (pretty crappy) Today Show item on the incident:
 
subego Mar 16, 2018 02:48 PM
July, 2010. Lethbridge County Airport, Alberta.

https://www.theglobeandmail.com/news...rticle6220481/
 
ghporter Mar 16, 2018 02:51 PM
Quote, Originally Posted by subego (Post 4397346)
July, 2010. Lethbridge County Airport, Alberta.

https://www.theglobeandmail.com/news...rticle6220481/
You posted while I was adding an extra bit to my earlier post... Good catch.
 
subego Mar 16, 2018 02:52 PM
Quote, Originally Posted by Spheric Harlot (Post 4397335)
Apart from the fact that he came down hard on that tarmac.
Luckily (?) he probably wasn’t concious at that point.
 
subego Mar 28, 2018 04:30 PM
 
Thorzdad Mar 28, 2018 05:30 PM
A nice hot day and a couple of hair dryers and she’ll be juuuuuust fine.
 
subego Mar 28, 2018 05:38 PM
Forensic analysis shows that after being forced to cope with this humility, the following words were spoken by the victim:

“I guess I should take all my wrecked shit out of the trunk.”
 
ghporter Mar 29, 2018 07:19 PM
Trunk stuff, car stuff, car itself...it's all wrecked. That won't buff out, though there's probably a little bit of salvage value in there somewhere. Not enough to pay for the MUCH higher insurance he just earned himself. Good job, Spanky!
 
subego Apr 3, 2018 03:06 PM
Flaming Woops noodle!

https://imgur.com/hDPWhD0.gif

I like the guy who decides mid-stride “not today”.
 
andi*pandi Apr 3, 2018 03:18 PM
he was on a cig break anyway.
 
subego Apr 4, 2018 11:51 PM
 
andi*pandi Apr 5, 2018 11:05 AM
good bridge.
 
Thorzdad Apr 5, 2018 11:24 AM
Yeah...They do build their bridges right, that's for sure. Wherever that is.

How the hell does something like that happen? I mean, how do you drive down a highway and not know your cargo bed is still elevated?
 
Laminar Apr 5, 2018 11:32 AM
Also it seems like kind of a dumb idea to drive directly in the Splash Zone™.
 
Thorzdad Apr 5, 2018 11:44 AM
The highway sign points to a lane for Quebec.
 
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