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 Visibility problems during the monsoons

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supratik_roy
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PostSubject: Visibility problems during the monsoons   Tue Jul 14, 2009 2:07 pm

Now that the monsoon is finally here in Mumbai .. I am having visibility problems while driving even in mild rain.

First of all I miss the rear wiper which I see in other cars. I cannot see the rear while driving as the glass is foggy and has water on it. Secondly, The front wind screen also does not clear up nicely even if the wipers are on. The water kind of spreads over the entire screen and sticks to it. Even the windows and the rear view mirrors have water sticking to it which makes driving all the more difficult. These problems happen even during light showers. Of course the fogging of the windows and screen on the inside reduces once I put on the AC.

Are there any products available in the market which when applied to the glass will prevent the water from sticking to it? Please advice.
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antony_j_k
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PostSubject: Re: Visibility problems during the monsoons   Tue Jul 14, 2009 2:56 pm

Hi supratik, i know its kind of very bad when the visibility is poor, and also with a huge car like logan having a good rear, it gets even tougher to drive when it rains cats and dogs. Anyway check out the below link. Its just one of the products available in market for mist problems. There are plenty of such products available in market. Check out for products named as Rainguard/Raintex which wil repell water from windshield.

Anti Fog Demister
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Mir...
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PostSubject: Re: Visibility problems during the monsoons   Tue Jul 14, 2009 4:21 pm

Just not to incur any additional expense.
If you have fog, turn on the A.C. and keep it running inside the cabin.
This keeps windows clear.

Windows get foggy as the temperature of water droplets hitting the glass is much lower than temperature on other side of glass. With A.C. you can drop the cabin temperatures and get rid of the Fog issue.

Sceintifically fog settles as a result of Water Vapor Condesation phenomenon.

Specially if you have dark sunscreen films on windows it will make even tougher during cloudy and rainy days as compared to windows with clear sunscreen or no sunscreen at all.
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vsuprak
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PostSubject: Re: Visibility problems during the monsoons   Tue Jul 14, 2009 9:20 pm

supratik_roy wrote:
....First of all I miss the rear wiper which I see in other cars....

Sedans inherently are not equipped with rear wipers. That is because, the amount of vortex generated. I'll post the image in my next post). The wipers you see is only on hatchbacks (cars without boot) or SUV's and MPV's.

Yes there are vehicles like Accent VIVA which have the rear wiper. This is due to the reason that they have a smaller boot.

Coming to your other query of clearing up the fog on the windscreen, just remember this thumb rule.

Mist formation on the glass occurs when the temperature on the outside surface of the glass is different from the inside surface.

So ideally speaking, if it is cold outside (in rains or winter) then you need to cool the inside surface of the glass to avoid formation of mist.

Since it is not possible to do that in places like delhi, you can use a heater. This takes a little longer time to clear up the glass but stays clear for a longer time. However, after some time you will notice that there is mist formation on the glass from outside (as it is much colder on outside) to clear which, you have to use the wipers.

It may be a little complicated to understand at first. Just try to think of a tumbler in which you pour cold water and you see droplets of water forming on the outside.
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vsuprak
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PostSubject: Re: Visibility problems during the monsoons   Tue Jul 14, 2009 11:01 pm

Ok I could make this image attached below which broadly explains the concept of vortex formation and why hatchbacks/SUV's need rear wiper more than Sedans.

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martin245
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PostSubject: Re: Visibility problems during the monsoons   Wed Jul 15, 2009 4:53 am

Put your blowers on Windscreen! turn on to FULL power Make sure the lever is not on recirculate and you should be OK
OH an open ALL vents and the two in the middle point upwards and they will clear the rear screen I suppose though it is humid (Steamy) air that comes in at this time of the year .................WHO KNOWS STEAMY WINDOWS afro
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tomlai
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PostSubject: Re: Visibility problems during the monsoons   Wed Jul 15, 2009 2:48 pm

Have just driven through near zero visibility rain. No real problems - thanks to a couple of coats of Raintex on all exterior glass surfaces every monsoon season. This obviates need for rear wipers as the rainwater simply beads up and you always have decent visibility without the distortion of smeary rain sticking to glass.

Keep windows up and AC on to keep humidity inside under control and its no problem at all.

Also make sure if you are blowing cold air through the AC, you do not face vents in such a position such that COLD AIR is coming directly in contact with glass, the glass will certainly mist up externally at those points.
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supratik_roy
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PostSubject: Re: Visibility problems during the monsoons   Wed Jul 15, 2009 3:31 pm

Thanks for the info. I will try out the different suggestions given...
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