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Why is the back of my van always the dirtiest? #1647390
20/12/2020 12:30
20/12/2020 12:30
Joined: Jun 2007
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respace Offline OP
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Never understood why the back is always filthy, I'd have thought that as it's virtually 90 degrees everything would run off but no. Must be something to do with the aerodynamics but don't see why it should stick on a virtually vertical plane.

Re: Why is the back of my van always the dirtiest? [Re: respace] #1647391
20/12/2020 13:09
20/12/2020 13:09
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I agree it seems counter to what you'd expect. I assume the low pressure eddies around the back allow the suspended muddy water particles to fall. And once it's collected some dirt, presumably it makes the surface even easier for the crud to stick to. Or something.

Re: Why is the back of my van always the dirtiest? [Re: respace] #1647394
20/12/2020 15:52
20/12/2020 15:52
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highlands
jimboy Offline
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It’s called the vortex effect.


I'm an old git & happy with it,most of the time
Re: Why is the back of my van always the dirtiest? [Re: jimboy] #1647396
20/12/2020 18:45
20/12/2020 18:45
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Originally Posted by jimboy
It’s called the vortex effect.


Thanks Jim, that sounds very Star Trek! Wait a minute your second names not Kirk is it? Why isn't the back of the Enterprise dirty?

Re: Why is the back of my van always the dirtiest? [Re: respace] #1647398
20/12/2020 19:16
20/12/2020 19:16
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Originally Posted by respace
Originally Posted by jimboy
It’s called the vortex effect.


Thanks Jim, that sounds very Star Trek! Wait a minute your second names not Kirk is it? Why isn't the back of the Enterprise dirty?


Live long and prosper smile


I'm an old git & happy with it,most of the time
Re: Why is the back of my van always the dirtiest? [Re: respace] #1647400
20/12/2020 20:28
20/12/2020 20:28
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JKD Offline
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Originally Posted by respace
Must be something to do with the aerodynamics



You're correct.

https://www.autobulbsdirect.co.uk/blog/why-do-rear-windscreens-get-dirty/

Re: Why is the back of my van always the dirtiest? [Re: respace] #1647471
23/12/2020 12:27
23/12/2020 12:27
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Thanks JKD that's a really good explanation. I may not have a turbo but I've got a vortex! To be more appropriate I may not have Brembos but I have a vortex to slow me down!

Re: Why is the back of my van always the dirtiest? [Re: respace] #1647528
27/12/2020 08:11
27/12/2020 08:11
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Tasmania
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Originally Posted by respace
Why isn't the back of the Enterprise dirty?


Below warp speed it collects dirt and grime, above warp speed it gets burnt off. Considering they're always in a hurry to get somewhere, most of the time they're at warp speed, you never see it when it's dirty. It's also not good PR for the Federation.


2000 grigio moon 20VT Plus.
Re: Why is the back of my van always the dirtiest? [Re: Grigio] #1647529
27/12/2020 10:04
27/12/2020 10:04
Joined: Sep 2010
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The Netherlands
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Originally Posted by Grigio
Originally Posted by respace
Why isn't the back of the Enterprise dirty?


Below warp speed it collects dirt and grime, above warp speed it gets burnt off. Considering they're always in a hurry to get somewhere, most of the time they're at warp speed, you never see it when it's dirty. It's also not good PR for the Federation.


I heard from a friend of a friend that the back of the Enterprise is dirty. They retouch the movie via machine learning to make it look prettier. Same as they did with Seven of Nine.


20VT, build in 1997, first used in 1998
https://youtu.be/mI0jZIIBc2w
20VT6 plus, build in 1999
Re: Why is the back of my van always the dirtiest? [Re: respace] #1647532
27/12/2020 12:42
27/12/2020 12:42
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Might explain why their hire vans are dirty, it's difficult to get to those sort of speeds in a Transit!

Re: Why is the back of my van always the dirtiest? [Re: respace] #1647534
27/12/2020 13:22
27/12/2020 13:22
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jaaps2 Offline
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Originally Posted by respace
Might explain why their hire vans are dirty, it's difficult to get to those sort of speeds in a Transit!


https://youtu.be/5KiC03_wVjc


20VT, build in 1997, first used in 1998
https://youtu.be/mI0jZIIBc2w
20VT6 plus, build in 1999
Re: Why is the back of my van always the dirtiest? [Re: respace] #1647535
27/12/2020 14:18
27/12/2020 14:18
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Nice and clean back to that one, I obviously need to drive faster!

Re: Why is the back of my van always the dirtiest? [Re: respace] #1647536
27/12/2020 17:09
27/12/2020 17:09
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jaaps2 Offline
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On topic: the coupe does not have a rear wiper for nothing.


20VT, build in 1997, first used in 1998
https://youtu.be/mI0jZIIBc2w
20VT6 plus, build in 1999
Re: Why is the back of my van always the dirtiest? [Re: jaaps2] #1647538
27/12/2020 22:39
27/12/2020 22:39
Joined: Dec 2005
Posts: 1,723
Brisbane, Australia
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Many years ago, when I was a young bloke, it was common here in Australia for station wagons to be fitted with an aftermarket rear air scoop that directed the air flow down over the rear window to reduce the build-up of dust on the window.


Re: Why is the back of my van always the dirtiest? [Re: respace] #1647542
28/12/2020 14:50
28/12/2020 14:50
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JKD Offline
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Originally Posted by respace
Nice and clean back to that one, I obviously need to drive faster!


No, what you need to do is this.

You need to take your van to an empty field on a hot day at 2:43pm and drive in reverse at 20mph, for exactly 30 seconds.

Doing this will create a temporal convergence in both the atmosphere outside the van as well as the atmosphere inside it. This will subsequently make positronic graviton particles as well as omega photon particles that are present in the air, come into direct contact with the back of the van. These particles will then sequentially bond and create a negatively charged non-stick surface.

And now for the science part! From then on, whenever your van moves forward at a speed of at least 10mph, this surface will constantly transmit electromagnetic protons that will actively repel dirt on a cellular level and prevent it from sticking to the back of your van.

biglaugh rofl

Re: Why is the back of my van always the dirtiest? [Re: JKD] #1647544
28/12/2020 16:04
28/12/2020 16:04
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Originally Posted by JKD
Originally Posted by respace
Nice and clean back to that one, I obviously need to drive faster!


No, what you need to do is this.

You need to take your van to an empty field on a hot day at 2:43pm and drive in reverse at 20mph, for exactly 30 seconds.

Doing this will create a temporal convergence in both the atmosphere outside the van as well as the atmosphere inside it. This will subsequently make positronic graviton particles as well as omega photon particles that are present in the air, come into direct contact with the back of the van. These particles will then sequentially bond and create a negatively charged non-stick surface.

And now for the science part! From then on, whenever your van moves forward at a speed of at least 10mph, this surface will constantly transmit electromagnetic protons that will actively repel dirt on a cellular level and prevent it from sticking to the back of your van.

biglaugh rofl



This has really made me sit up.

I will try this procedure in the coupé going forwards so I'll never have a problem with dirt on the rad grille again!


Now to fathom out the vertical take-off issue chinny


BumbleBee carer smile
Re: Why is the back of my van always the dirtiest? [Re: Edinburgh] #1647549
28/12/2020 17:42
28/12/2020 17:42
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Posts: 947
Dorchester
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respace Offline OP
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Originally Posted by Edinburgh
Originally Posted by JKD
Originally Posted by respace
Nice and clean back to that one, I obviously need to drive faster!


No, what you need to do is this.

You need to take your van to an empty field on a hot day at 2:43pm and drive in reverse at 20mph, for exactly 30 seconds.

Doing this will create a temporal convergence in both the atmosphere outside the van as well as the atmosphere inside it. This will subsequently make positronic graviton particles as well as omega photon particles that are present in the air, come into direct contact with the back of the van. These particles will then sequentially bond and create a negatively charged non-stick surface.

And now for the science part! From then on, whenever your van moves forward at a speed of at least 10mph, this surface will constantly transmit electromagnetic protons that will actively repel dirt on a cellular level and prevent it from sticking to the back of your van.

biglaugh rofl



This has really made me sit up.

I will try this procedure in the coupé going forwards so I'll never have a problem with dirt on the rad grille again!


Now to fathom out the vertical take-off issue chinny


Most of this is perfectly sensible, common sense, the only bit I'm struggling with is getting a hot day and 30mph in reverse! Undermines an otherwise perfectly reasonable post.

Re: Why is the back of my van always the dirtiest? [Re: respace] #1647558
28/12/2020 23:33
28/12/2020 23:33
Joined: Mar 2007
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Originally Posted by respace
Never understood why the back is always filthy, I'd have thought that as it's virtually 90 degrees everything would run off but no. Must be something to do with the aerodynamics but don't see why it should stick on a virtually vertical plane.


The back of Mrs Ed's Seat Mii is also vertical and it suffers exactly the same fate frown


BumbleBee carer smile

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