I hope Russia maintains their aircraft better than ski lifts

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Jon Beck

Trad climber
Oceanside
Topic Author's Original Post - Mar 16, 2018 - 10:59am PT
https://www.google.com/amp/metro.co.uk/2018/03/16/ski-lift-sends-people-flying-chairlift-goes-control-7393217/amp/
justthemaid

climber
Jim Henson's Basement
Mar 16, 2018 - 11:05am PT
OMG^^^ Ski lift goes totally haywire.

NOT.. jumping for your life...
was NOT an option.
monolith

climber
state of being
Mar 16, 2018 - 11:05am PT
I hope they build their pedestrian overpasses better than we build ours.
Reilly

Mountain climber
The Other Monrovia- CA
Mar 16, 2018 - 11:45am PT
It ain’t Russia, homes. But why wuzzit running backwards?

Having been on quite a few Rooskie aircraft I don’t plan on getting on any more if I can help it.
I prefer my mechanics sober.
Rollover

climber
Gross Vegas
Mar 16, 2018 - 11:49am PT
HO LEE FUK!
Worst nightmare as a lift mechanic!
Why didn’t the rollback dog brake engage!?!?
WBraun

climber
Mar 16, 2018 - 11:54am PT
Meh ... more Russia bashing by st00pid brainwashed Americans.

This very same thing happened on Chair 2 in Mammoth in the 70's.

The bullwheel brake failed and the cable went backward throwing people off the chairs on their way back to the loading ramp
until one of the chairs jammed itself into the bullwheel.

I was right there working Chair 2 when this happened.

It's NOT a Russian thing only.

The dumb ass American media is obsessed with bashing Russia and Putin.

st00pid brainwashed Americans .....

Reilly

Mountain climber
The Other Monrovia- CA
Mar 16, 2018 - 11:57am PT
It wuz GEORGIA!
Alexey

climber
San Jose, CA
Mar 16, 2018 - 12:59pm PT
yes, it is Gorgia,
Russian maintain their aircraft very well and dropping tons of gold!
https://www.unian.info/world/10042994-russian-plane-loses-almost-nine-tonnes-of-gold-amid-incident-in-yakutsk-photos.html
Reilly

Mountain climber
The Other Monrovia- CA
Mar 16, 2018 - 03:42pm PT
It’s simple. They ran out of quarters.
gruzzy

Social climber
socal
Mar 16, 2018 - 10:30pm PT
We will probably find out soon enough about their aircraft
Reilly

Mountain climber
The Other Monrovia- CA
Mar 16, 2018 - 11:48pm PT
There's no free lunch, especially in aerodynamics. Yes, Rooskies design
good aircraft per their design parameters, such as operating from secondary
airfields. But designing intakes such that they are less likely to ingest
foreign objects mean they don't ingest air as well. That's why nothing
could touch the Tomcat, the Strike Eagle, or the Fighting Falcon. The
Rooskies design good aircraft, but we design the best.
neebee

Social climber
calif/texas
Mar 16, 2018 - 11:59pm PT
hey there, say....

oh my... also, liked werner's bit of history, as to
what happened...

will go read about bullwheel brakes...

good that it was not worse, :O

thanks for some tech-stuff, here, to go learn...
John M

climber
Mar 17, 2018 - 12:32am PT
Tad..

I am not an expert, but have worked a few lifts. Most lifts have multiple brakes. Some on the drive shaft and some on the bull wheel. One reason a lift can spin backwards is if a drive shaft breaks. That negates the driveshaft brakes which are usually the main brakes. ( In my limited understanding )

The reason the lift spins backwards when being operated is because there is a greater load on the uphill side with all the skiers. With no brakes, gravity takes over.

The bull wheel also has a number of different mechanisms that are used to keep it from spinning backwards. I believe that some lifts have a friction brake on the bull wheel. Plus there is some form of an anti roll back device. I worked lifts over 20 years ago, so this is likely old knowledge, but we still have lots of older lifts out there. One anti roll back device I have seen worked like a kind of ratchet. A gear on the bull wheel had teeth on it. A metal bar laid over those teeth. As long as the bull wheel turned in the proper direction, the bar would slide over it. If it started to spin backwards, then it would drop into place and stop it. I do not know if they still use this kind of anti roll back device, but I doubt it. This kind of device needs no activation. So it is a failsafe device.

Another antiroll back device is called a dog pin or drop dog. It is a large steal pin that can be dropped into the spokes of the bull wheel. This is a method of last resort as it would destroy the bull wheel and if the spokes break, then other catastrophes can happen, such as the bull wheel dropping and dropping the cable. Plus if it is activated and the cable is spinning very fast, then the sudden stop would cause the chairs to swing wildly. That could cause many people to be ejected from chairs while high off the ground.

For a catastrophic rollback to occur, there needs to be a number of failures.

This is just my limited understanding.

Here is another video of a chairlift spinning backwards during a test.

[Click to View YouTube Video]

Edit: this article describes the causes of one accident at sugarloaf.

http://www.saminfo.com/headline-news/8089-14005-687-sugarloaf-releases-preliminary-findings-on-lift-rollback
hossjulia

Trad climber
Carson City, NV
Mar 17, 2018 - 07:37am PT
That's a classic lift op training film. There was a broken leg involved in that film from what we were told.
Guardia is blaming the haul rope manufacturer. I'm not getting how that could cause multiple braking systems to fail.
Another report says the lifty "accidentally shifted it into reverse", and in trying to correct it broke the transmission. That doesn't sound right at all.
We may never hear the real reason. Doppylmayer is investigating too so there may eventually be a report from them.
Werner is spot on again.
Jon Beck

Trad climber
Oceanside
Topic Author's Reply - Mar 17, 2018 - 07:39am PT
I will not be able to ride a lift without planning my escape from a failed brake
Chaz

Trad climber
greater Boss Angeles area
Mar 17, 2018 - 08:14am PT
In Soviet Russia, ski lift rides you.

What a country!
justthemaid

climber
Jim Henson's Basement
Mar 17, 2018 - 11:06am PT
FYI sidebar: Georgians HATE being called "Russians" just ask one- they will emphatically tell you so.

...chairlift engineering notwithstanding.
Splater

climber
Grey Matter
Mar 17, 2018 - 01:26pm PT
The full length version of lift failure testing at Winter Park in 1990.
https://www.youtube.com/watch?v=u4WPSZojtyE
The lift was about to be retired anyway.
Incredibly it says they had the whole thing operating again the next day,
just good enough to continue testing.

Sugarloaf 2015 rollback videos
explained by John M's link.
https://www.youtube.com/watch?v=H9zLojBpQ_I
https://www.youtube.com/watch?v=TunSMIAcw6Y

another failure
https://www1.maine.gov/pfr/professionallicensing/professions/elevator/pdf/Final%20Report%20Sugarloaf%20Spillway%20East%20Report.pdf
Toker Villain

Big Wall climber
Toquerville, Utah
Mar 17, 2018 - 01:34pm PT
But the lift tickets are much lower than here.
Jon Beck

Trad climber
Oceanside
Topic Author's Reply - Mar 17, 2018 - 01:53pm PT
But the lift tickets are much lower than here.

Cuz they take you down the hill!
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