Wind deflector - Acrylic or Mesh - Mercedes Benz SLK Forum

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#1 Old 07-28-2017
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Question Wind deflector - Acrylic or Mesh

Hi All,
My SLC came with the standard mesh type wind deflector which I have to say works very well.
As others have said though not that good for seeing through so ordered an acrylic one for a 172 which is great for visibility.
Driving with it in place and the roof down though definitely causes more turbulence in the cab compared to the mesh one.
Not in a major way but enough to be noticeable.
I assume the mesh one slows air speed down but allows it to dissipate whereas the acrylic one doesn't let the air escape in quite the same way.
This is probably why MB supply a mesh deflector rather than an acrylic one.
Rear visibility with the acrylic one is superior, although you do get a reflection of the dash.
Anyone else noticed any difference?
Cheers, David
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#2 Old 07-28-2017
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David @Piecrust,


I agree, almost totally, with your comments.


Visibility with the mesh deflector is poor, especially at night. With an acrylic one, it is massively improved, but it did take a while to get used to the reflections and ignore/'see through' them.


I haven't noticed any change in cabin turbulence, but then I haven't done any back-to-back testing on the same road /same speed/same weather conditions!


Prefer the acrylic one - rearward visibility is crucial - and the mesh one definitely inhibits that.


With hindsight, however, I would have bought a thicker acrylic one. Mine, at 3mm, has a bit of vibration (not purely speed dependant). Five or even eight mm would be better!


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#3 Old 07-28-2017
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#4 Old 07-28-2017
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#5 Old 07-29-2017
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Spotted this on ebay which is reported to be an original MB part.
Its for a 171 but it's see through and has an air gap at the bottom which I assume is to reduce any turbulence.
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File Type: jpg slk 171 wind deflector.jpg (63.5 KB, 41 views)
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#6 Old 07-29-2017
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Quote:
Originally Posted by Pyecrust View Post
Spotted this on ebay which is reported to be an original MB part.
Its for a 171 but it's see through and has an air gap at the bottom which I assume is to reduce any turbulence.
I have that one, but I think the air gap is mainly there for visability of the indicators of the rear park distance control. Did not notice any difference in turbulence compared with the R171 mesh one.
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#7 Old 07-29-2017
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Originally Posted by Sneaky Pete View Post
I have that one, but I think the air gap is mainly there for visibility of the indicators of the rear park distance control. Did not notice any difference in turbulence compared with the R171 mesh one.
Thanks Pete do you need to see the rear park sensors don't they just bleep?
The fact that you don't notice any difference in turbulence compared to the mesh may be due to the holes in the acrylic one.
Just a thought.
Cheers, David
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#8 Old 07-29-2017
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Acrylic Wind Deflector for Mercedes SLK r172 Acrylic Glass | eBay


Hope this link works because this protector is a straight swop for the OE AND looks OE rather than a DIY afterthought.
It is very thick & works so well that I had a copy made that was slightly tinted which looks even more OE.
It does not move or vibrate at all BUT it had not occurred to me that the mesh one might cause less cabin turbulence, which frankly is much much worse than my previous Audi A3 Cab., Honda S200 & Mk 1 Mazda MX-5.
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#9 Old 07-29-2017
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Originally Posted by oldmercman View Post
Acrylic Wind Deflector for Mercedes SLK r172 Acrylic Glass | eBay


Hope this link works because this protector is a straight swop for the OE AND looks OE rather than a DIY afterthought.
It is very thick & works so well that I had a copy made that was slightly tinted which looks even more OE.
It does not move or vibrate at all BUT it had not occurred to me that the mesh one might cause less cabin turbulence, which frankly is much much worse than my previous Audi A3 Cab., Honda S200 & Mk 1 Mazda MX-5.
That's the one I ordered and it is quite thick and substantial, (he takes offers on the price by the way).
I changed the big plastic knurled knobs for stainless steel M6 bolts and washers.
Interesting that you have more turbulence than previous 2 seater sports cars.
The whole point of a mesh one is that it slows the air down but still lets it escape whereas the acrylic one seems to trap the air and cause turbulence before it escapes over the top. I didn't feel any turbulence with the mesh one but I can with the acrylic but the acrylic is great for rear vision.
Maybe a line of holes along the bottom might sort it!
Although I won't try and drill them myself!
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#10 Old 08-02-2017
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Originally Posted by Pyecrust View Post
That's the one I ordered and it is quite thick and substantial, (he takes offers on the price by the way).
I changed the big plastic knurled knobs for stainless steel M6 bolts and washers.
Interesting that you have more turbulence than previous 2 seater sports cars.
The whole point of a mesh one is that it slows the air down but still lets it escape whereas the acrylic one seems to trap the air and cause turbulence before it escapes over the top. I didn't feel any turbulence with the mesh one but I can with the acrylic but the acrylic is great for rear vision.
Maybe a line of holes along the bottom might sort it!
Although I won't try and drill them myself!

Great minds think alike as I too changed the black knobs for a couple of chrome domed nuts (stainless steel would have been more subtle).
Have just re-fitted the OE mesh one & on a short journey I think there was less turbulence & to be honest the very slight lack of vision through the mesh is not nearly the big fuss that some make out. Doing longer journey tomorrow. Am tempted to paint the frame of the mesh gloss black to match the bodywork - dare I ?
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#11 Old 08-06-2017
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Just completed a 30 mile trip & am convinced the solid deflector does create more turbulence, not a lot but noticeable.
Thus contributing to my cynical assumption that most amateur attempts to make & sell after-market supposed improvements is more about extracting money from the susceptible. Maybe just maybe Mercedes know more than we do.
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#12 Old 08-06-2017
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Originally Posted by oldmercman View Post
Just completed a 30 mile trip & am convinced the solid deflector does create more turbulence, not a lot but noticeable.
Thus contributing to my cynical assumption that most amateur attempts to make & sell after-market supposed improvements is more about extracting money from the susceptible. Maybe just maybe Mercedes know more than we do.
Had a shufty around some of the other cabriolet forums and the general conclusion is that the mesh is more efficient at reducing draft and turbulence. On my old VW Eos the mesh wind deflector folded down so when you dropped the roof you could just lean back and pull it up till it snapped into place.
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#13 Old 08-08-2017
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Originally Posted by Pyecrust View Post
Had a shufty around some of the other cabriolet forums and the general conclusion is that the mesh is more efficient at reducing draft and turbulence. On my old VW Eos the mesh wind deflector folded down so when you dropped the roof you could just lean back and pull it up till it snapped into place.
Ditto my Audi A3 Cabriolet. With mesh windbreaker in place it was 100% draught free, as warm as toast in winter & cool in heat waves. No convertible or 2 seater sports car prior or since has come anywhere near such aerodynamic cabin perfection. I regret selling it & the latest model too long & too A5-like.
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#14 Old 08-11-2017
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I don't notice any turbulence except where the top of my head is above or at the top of the windshield. I've noticed I can put papers on the passenger seat and they don't blow away. I had the oem clear one on my slk and it was much better than the mesh, especially at night. But the mesh of the SLC is much better visibility at night than the SLK. I thought I would want to replace it, but I've found that I keep the mesh on all the time.
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#15 Old 08-11-2017
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I don't notice any turbulence except where the top of my head is above or at the top of the windshield. I've noticed I can put papers on the passenger seat and they don't blow away. I had the oem clear one on my slk and it was much better than the mesh, especially at night. But the mesh of the SLC is much better visibility at night than the SLK. I thought I would want to replace it, but I've found that I keep the mesh on all the time.
The OE clear deflector is I assume the 2 discs that overlap leaving a small gap at the bottom through which air may pass.
Some owner have claimed this set-up was useless.


I have to admit to discovering the one time when the mesh deflector is a pain to see through & that's when the roof is up, it's raining & water droplets are not running off the back window - then visibility is terrible. However it was the work of a moment to stop & remove the mesh screen & tuck it behind the passenger seat. .
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I don't know what the "2 discs that overlap" are. here is a link to a picture of the oem one (which I think is lexan and not acrylic) http://images55.fotki.com/v648/photo...lk08068-vi.jpg

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#17 Old 08-11-2017
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don't confuse r171 oem with oem r172
oem r171 will not fit on r172


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#18 Old 08-11-2017
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Lots of variables that might be having an affect the performance of the wind screens. Weather, side windows up or down, vehicle speed, driver/passenger height. AC on or off, fan speed, etc. I personally found on our R172 (2015 SLK 250) that the lexan full wind screen did reduce the air coming from between the seats a bit. Was there enough of a difference to matter...not really, however our weather is milder here.

Not going to bother with it on the R171 we have now. Anybody want a R172 aftermarket lexan/velcro wind screen?...PM me.

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#19 Old 09-05-2017
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Well I must confess that having compared the two on similar routes the mesh wind deflector is superior.
The acrylic deflector has better visibility to the rear but it suffers from reflection of the dash which I could put up with but combine this with a pronounced increase in turbulence when the top is down I feel that the mesh is better.
OK visibility is reduced with the mesh a little through the rear view mirror but not that bad that I can't rely on the side mirror's to compensate for that. Just my personal opinion of course and I know that many prefer the versatility of the acrylic as it can be etched and even illuminated and looks cooler from the rear!
Cheers, David


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#20 Old 09-05-2017
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The mesh works for me, and only takes a couple of seconds to take off if its anoying me.

As for visibility i also drive a motorhome, so only have mirrors

(the internal rear view mirror only shows me my kitchen)

But from what i have read on this fourm why are you lookIng at what you have left behind
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