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Post by Cybermortis on May 24, 2013 14:26:02 GMT
*Slides in to comment* From the comments I've seen it appears that MB failed to consider that the myth about manhole covers may not have originated in the US or with Indy Cars. Other countries, especially in Europe, may use lighter covers and of course F1 has been racing around the streets of Monaco for decades.... Oh, and the myth IS confirmed...sort of. A race in Montreal ended after a car was destroyed by part of a manhole cover that had been torn out of the ground back in 1990; www.f1fanatic.co.uk/2011/05/01/questions-answered/
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Post by the light works on May 24, 2013 15:03:46 GMT
This depends on the age & location of the manhole covers. I've seen a lot of each type (with & without holes). But, I can definitely see where the holes would prevent any lifting of the manhole at all. gotta be awfully hard to lift the ones without holes, isn't it? I guess that would be the next test - if you could lift a manhole cover (no holes) with a suction cup; then it is possible.
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Post by the light works on May 24, 2013 15:11:31 GMT
*Slides in to comment* From the comments I've seen it appears that MB failed to consider that the myth about manhole covers may not have originated in the US or with Indy Cars. Other countries, especially in Europe, may use lighter covers and of course F1 has been racing around the streets of Monaco for decades.... Oh, and the myth IS confirmed...sort of. A race in Montreal ended after a car was destroyed by part of a manhole cover that had been torn out of the ground back in 1990; www.f1fanatic.co.uk/2011/05/01/questions-answered/the catch is that "torn out of the ground" is somewhat ambiguous. here, I periodically see the lids for water shutoffs that are flipped upside down or canted in their holes (these are about 8 inches in diameter) and I always assume it has more to do with being placed wrong than anything else. it is also pretty common to hear manhole covers that are in the tire tracks clanking as cars drive over them; from being poorly fitted.
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Post by The Urban Mythbuster on May 24, 2013 15:44:51 GMT
They have retractable handles to get them in & out of place.
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Post by the light works on May 24, 2013 16:30:10 GMT
They have retractable handles to get them in & out of place. so technically, there is a hole, but it is essentially closed off. I think I recall seeing some of those.
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Post by blazerrose on May 25, 2013 2:40:14 GMT
Assuming the cars drove in almost precise single file, wouldn't there actually be fluctuations in air pressure as cars passed over, as there would be a gap (pressure release) between each car passing over? you're thinking it might "bounce" it? it's a longshot, but it might be possible. I still think there is just too much mass per surface area to lift with less than 1 atmosphere of pressure differential. especially since real manhole covers have holes in them. That's kind of what I was after. I think they should have tried with multiple vehicles and different materials/sizes. The problem is, I'm sure the IMS didn't want their track all dorked up with hole after hole after hole.
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Post by srmarti on May 25, 2013 16:01:39 GMT
you're thinking it might "bounce" it? it's a longshot, but it might be possible. I still think there is just too much mass per surface area to lift with less than 1 atmosphere of pressure differential. especially since real manhole covers have holes in them. That's kind of what I was after. I think they should have tried with multiple vehicles and different materials/sizes. The problem is, I'm sure the IMS didn't want their track all dorked up with hole after hole after hole. That's not what you originally asked though. You asked about multiple cars passing and building up a vacuum, not bouncing the manhole cover.
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Post by the light works on May 25, 2013 18:23:12 GMT
That's kind of what I was after. I think they should have tried with multiple vehicles and different materials/sizes. The problem is, I'm sure the IMS didn't want their track all dorked up with hole after hole after hole. That's not what you originally asked though. You asked about multiple cars passing and building up a vacuum, not bouncing the manhole cover. so you're saying she is so good with the language that she always says exactly what she means on the first try?
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Post by blazerrose on May 26, 2013 3:03:55 GMT
I duz speek English from time to time.
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Post by kharnynb on Mar 26, 2014 21:10:53 GMT
The things i learned from this episode: -That's not a sauna, that's a barely warm room....(real sauna should be at least 85C and preferably 95C) -Missus C cannot drive a stick shift?
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