Pano Roof warbling/air pressure noise at 148mph
09-04-2018, 01:49 PM
#1
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Pano Roof warbling/air pressure noise at 148mph
This is on the track (of course). All windows up, roof and roof shade completely closed. Very noticeable.
Anyone else experienced this and if so, normal/expected behavior that has no potential for the pano roof to just..explode? :-)
thanks
Anyone else experienced this and if so, normal/expected behavior that has no potential for the pano roof to just..explode? :-)
thanks
09-04-2018, 07:57 PM
#2
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2007 Mercedes E63 AMG
mine does this also...sounds like a rocket ship waiting to take off...
being it we own a Mercedes and a 200 mph capable car I'd assume we are safe, Mercedes are purpose built...but you never know.
being it we own a Mercedes and a 200 mph capable car I'd assume we are safe, Mercedes are purpose built...but you never know.
09-04-2018, 09:23 PM
#3
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Idk dude, you’d need to change a lot to hit 200mph. I wouldn’t trust stock suspension at 200. But the breaks def are capable!
09-05-2018, 11:47 AM
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and here's a video of the same guy just owning Nordschleife
Last edited by hachiroku; 09-05-2018 at 11:52 AM.
09-05-2018, 11:53 AM
#6
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310 kph = 192.625 mph...granted the German Autobahn has the best roads in the world for this being as they have 4 feet of pavement versus 3 feet deep used in America.
https://www.youtube.com/watch?v=RdC92uJbCO8
https://www.youtube.com/watch?v=RdC92uJbCO8
09-05-2018, 03:14 PM
#7
Well it may never be safe to drive 200mph on the Autobahn again seeings how its pavement is only 27" thick, not the four feet you pulled out of your ***.
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09-05-2018, 03:23 PM
#8
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2007 Mercedes E63 AMG
dunno what documentary I watched but that's where I recall the figures.
https://www.quora.com/How-thick-is-t...-is-beneath-it
https://www.quora.com/How-thick-is-t...-is-beneath-it
Since no-one has, of yet, answered this question, I thought I would conduct a bit of research, as it would be a shame to see it go unanswered.
TL;DR - Wide variation, between 29 and 120cm.
It turns out that there is a lot more to a road than first meets the eye. There are different types, but the most common one is made up of these layers.
--------------------------------------
Surface Course
--------------------------------------
Binder Course
--------------------------------------
Base
--------------------------------------
Sub-Base
--------------------------------------
Capping
- - - - - - - - - - - - - - - -
Sub-Grade
When an area to become a road is being excavated, the ground left exposed is known as Sub-Grade which is usually compacted and then covered with a layer known as Capping.
The thickness of the capping varies based on the CBR (California Bearing Ratio)* of the sub-grade. This can vary between 0mm (not required) and 600mm.
The Sub-Base is usually added as quickly as possible to prevent damage from the sun or rain. It can vary between 150mm and 225mm depending on whether there was a capping layer added and how many vehicles are expected to use the road.
The Base can range from 0mm to 230mm.
The Surface Course and Binder Course are together termed the surfacing. They are usually laid as two separate courses, in which case the binder course has a thickness of 45mm to 105mm and the surface course has a thickness of 20mm to 40mm.
All in all, the thickness of a road measured from the sub-grade can vary from 29-120cm.
* - The California Bearing Ratio of a soil sample is a measure of its load-bearing capacity. It is measured by seeing how much pressure has to be applied to push a plunger a certain distance into the sample and taking a percentage against the same test on a standard sample of crushed rock. The higher the value, the better the load bearing capacity.
Sources:
http://incatrad.com/highway.htm
http://www.pavingexpert.com/blok...
http://en.wikipedia.org/wiki/Cal...
Disclaimer - Not being a civil engineer myself, I cannot verify that the information presented here is accurate, and would welcome anyone that does this sort of thing in real life to correct me.
TL;DR - Wide variation, between 29 and 120cm.
It turns out that there is a lot more to a road than first meets the eye. There are different types, but the most common one is made up of these layers.
--------------------------------------
Surface Course
--------------------------------------
Binder Course
--------------------------------------
Base
--------------------------------------
Sub-Base
--------------------------------------
Capping
- - - - - - - - - - - - - - - -
Sub-Grade
When an area to become a road is being excavated, the ground left exposed is known as Sub-Grade which is usually compacted and then covered with a layer known as Capping.
The thickness of the capping varies based on the CBR (California Bearing Ratio)* of the sub-grade. This can vary between 0mm (not required) and 600mm.
The Sub-Base is usually added as quickly as possible to prevent damage from the sun or rain. It can vary between 150mm and 225mm depending on whether there was a capping layer added and how many vehicles are expected to use the road.
The Base can range from 0mm to 230mm.
The Surface Course and Binder Course are together termed the surfacing. They are usually laid as two separate courses, in which case the binder course has a thickness of 45mm to 105mm and the surface course has a thickness of 20mm to 40mm.
All in all, the thickness of a road measured from the sub-grade can vary from 29-120cm.
* - The California Bearing Ratio of a soil sample is a measure of its load-bearing capacity. It is measured by seeing how much pressure has to be applied to push a plunger a certain distance into the sample and taking a percentage against the same test on a standard sample of crushed rock. The higher the value, the better the load bearing capacity.
Sources:
http://incatrad.com/highway.htm
http://www.pavingexpert.com/blok...
http://en.wikipedia.org/wiki/Cal...
Disclaimer - Not being a civil engineer myself, I cannot verify that the information presented here is accurate, and would welcome anyone that does this sort of thing in real life to correct me.
Last edited by hachiroku; 09-05-2018 at 03:26 PM.
09-05-2018, 03:25 PM
#9
09-06-2018, 02:25 PM
#12
MBWorld Fanatic!
What does it matter if the road is 3 feet or 4 feet thick for speed????
09-06-2018, 02:33 PM
#13
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2007 Mercedes E63 AMG
the more thicker of a base surface you have the better it sustains deformation with usage or shifting of the earth therefore you can have a flatter tarmac. flatter tarmac will support higher speeds without directly upsetting suspension and stability.
09-06-2018, 02:35 PM
#14
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