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The primary reason has already explained well by our fellow member. The secondary reasons are those ribs will help to drain the water well and it will give better aesthetics compared to plain roof.

Ya I have noticed more water is stacked on a plain roof compared to the roofs with stripes.

Also a weird thought, I feel it can also be used like a under support for luggages in case you need to place them in some critical scenarios stupid:

I had experienced in my previous cars that the idol on the dashboard would come out after few months especially after a rough ride. I would like to know what is a fool proof mean of securing the idol on the dashboard without spoiling the dashboard. Will the 3M double tape be able to keep the idol secure?

Definitely not the right place to post this except that the item required is for XUV. But could not find any thread on it and did not want to start a new one.

For a long time, I have been using a square piece of 3M double-side tape to secure the idols in place. Unless someone knocks against the idol (like when cleaning the dash), the tape is more than sufficient. And easy to replace if required.

I have also tried using Fevicol SR, but this has not been any better than using 3M tape.

Note:
My cars are parked in the sun.

I used to use 3M double sided tape in Ford Fiesta, however in summers, due to heat, it used to come out. Now in XUV, i keep idols inside top drawer in the middle of the dash.

Let me show a simple demo as the pics are better than the words. :)

Take a sheet of paper and place it between two supports.



Place a paper-weight at the centre of support. Naturally, the paper cannot withstand the weight of the paper-weight and goes down with the paper-weight.



Now, fold the same paper in a zig-zag manner, spread and keep it between the same supports.



Place the paper-weight at the centre.



The folded paper acts like a corrugated sheet and withstands the load with the folds acting as stiffeners making the flexible sheet into a rigid sheet. Similar is the case with the folds on XUV500's top, which will enhance the rigidity of the sheet apart from enhancing the aesthetics.

Take a look at the Micra's roof. It's a lot more "stylish"! :) It's NOT a line shaped rib but two boomerang shaped ones.

Easily. I had the idol stuck on the dash for a clean 4 years till my friend's 2-3 year old plucked it with both his hands with great force. A car will definitely NOT be subjected to jerks with that kind of a force unless...

The only thing you need to take care is to make sure the base of the idol is completely covered in the tape. If the rectangular shaped strip does NOT cover the complete base, make sure you add additional strips on the un-covered places and cut it well.

If you do NOT cover the complete base, chances are high it will come off. I initially faced that issue.

Lovely Demo. Well illustrated. Many Cargo Carriers have their load bearing floors and sides corrugated like that. Same is applicable to roofing sheets as well. One has to try feel the difference to appreciate the change in structural strength!

Look who's home?




Was not caught off-guard for the ceremony since I knew what to expect after reading the owner threads on T-BHP.




PS: Will start an ownership thread. Got to take this 'GUY' for a spin :-)

Ravi sir, what a demo! My son - who is a class III student - took just one look and absolutely no explanation was required from my end, he summed it up: " the paper became strong when folded." :D

Thanks for providing Lesson One of structural engineering.

Edit: :OT

Awesome illustration sir, probably I would have forgot the purpose of corrugated sheets if you had asked me couple of months later, but now with this illustration I will never forget this and I can let people know who are willing to know about this. Thanks once again sir :) you rock:thumbs up

Well, nothing to take away from J Ravi's explanation of corrugated roof. It's without doubt precise. But looking at the number of thanks he got:uncontrol, it seems we do have a lot of non engineering background BHPians.
It's a basic concept taught in engineering first year, strength of materials.

I simply couldn't stop :uncontrol at that comment. agree: It's a basic concept taught in engineering first year, strength of materials, but then how many of us "so called engineers" apply it in our day-to-day life.

What Ravi Sir did was a simple illustration & I believe no one would deny that a picture is worth thousand words. The spontaneous "Thanks" that he received were not for enlightening us on the SoM principle, but for the pains he took in demonstrating it, taking the pictures & explaining it over here. Nowadays who has so much patience to explain you like a child.

On a closing note, I have a gut feeling that 90% of the thanks received by his post above would be from engineers.

As auto Indian said, the thanks is more for the pain taken to explain the concept using illustrations. The more the thanks, the better it is for such a useful post which enables people to instantly connect to how a corrugated sheet is better. Great work Ravi sir.

Thanking one is a good virtue. Forums are meant to share ideas. Let us support and thank those who take pains to explain things and support who are open to appreciate good posts. Thanking again Mr Ravi for his wonderful explanation and for the pain taken to post it.