Stone chips. Aerodynamic Issue?

k44ENT · 03-15-2011, 10:58 PM

Remember the stone in question has probably been flicked up by another vehicle and will therefore be travelling at a certain speed and therefore has kinetic energy. The speed the stone is travelling combined with the speed you are travelling is the impact speed on the screen. The screen has to absorb the energy in the travelling stone (kinetic energy) which it does in the form of noise and impact damage to the screen. I still maintain that the car is prone to chips, whether it be aerodynamics or just the sheer size of the thing? Also a certain amount of luck is involved because the stone has to be there in the first place so no stray stones from other cars = no chips!

Jon D · 03-16-2011, 04:48 AM

Quote:

Originally Posted by E61

Also a certain amount of luck is involved because the stone has to be there in the first place so no stray stones from other cars = no chips!

Quite so and hence my earlier point about there being more grit on the roads than in a more normal winter. I'm just glad I opted for a white car - the chips are there, but you have to look very close to see them.

k44ENT · 03-16-2011, 01:50 PM

Quote:

Originally Posted by Jon D

Quite so and hence my earlier point about there being more grit on the roads than in a more normal winter. I'm just glad I opted for a white car - the chips are there, but you have to look very close to see them.

I nearly went for a white one but in the end went for Jet Black

jangof10 · 03-16-2011, 04:04 PM

I have been watching this post for the last couple of days. Stone chips are defiantly top of mind right now for me as well. We are finally starting to get some melting on the roads where I live (Calgary) and 4 months of grit and debris is flying all over the roads.

I got my first to major stone hits on my front window last weekend. I was driving back from the mountains and got hit by stones twice. Happily the noise was the worst part and the window did not crack.

When I purchased the car I did get the 3M paint protection film(sometimes called a 'Clear Bra') applied to the car. This is supposed to stop any rock chips in the paint. So far so good.

SpawneyGet · 03-16-2011, 06:19 PM

Not just grit but bits of the road from the numerous potholes from extra cold winter here in England this winter. Our roads probably aren't designed to withstand these recent low temperatures.

And when are they bloody going to get round to getting them fixed? Blink an eye and I am in one and my beautiful new wheels are damaged! Perhaps never, with the cuts we are having...

tallshorty · 03-17-2011, 01:28 AM

I got a chip on my hood and right fender, and two chips on the windshield 2 weeks after getting the car. Wish I had installed clearbra from the getgo. Brought my car into the insurance company and they will pay for a new windshield and repaint the hood and right fender for $300 deductible ($1800 estimated cost). Not a bad deal. Doesn't affect my premium. Didn't know they would cover this. Had I known, I would've waited a few more years to collect more dings and chips and claim it all at once. Now I got some chips on the bumper too. Oh well. I'm learning to live with it now.

k44ENT · 03-17-2011, 10:23 AM

Quote:

Originally Posted by SpawneyGet

Not just grit but bits of the road from the numerous potholes from extra cold winter here in England this winter. Our roads probably aren't designed to withstand these recent low temperatures.

And when are they bloody going to get round to getting them fixed? Blink an eye and I am in one and my beautiful new wheels are damaged! Perhaps never, with the cuts we are having...

+1

Shake n Bake · 05-10-2011, 07:32 AM

A couple of months on and 5500 miles on the clock....I have had just 1 more occurance. So bye bye sexy aerodynamic issue question and hello mundane dirty winter roads explanation.

Whteverjklasdf · 05-10-2011, 09:07 AM

people get frequent stone chip mostly due to regular tailgating.

Jon D · 05-10-2011, 12:29 PM

Quote:

Originally Posted by Sealobo

people get frequent stone chip mostly due to regular tailgating.

Or having the misfortune to meet a gritting truck coming towards you in the opposite lane. Not very much you can do to avoid the cascade of grit/rock salt except perhaps drive into the ditch, but then you'd have more than stone chips to worry about

.

grimlock · 05-10-2011, 12:57 PM

Quote:

Originally Posted by Sealobo

people get frequent stone chip mostly due to regular tailgating.

I got my first stone chip yesterday, when I was driving at an abnormally normal 3-4s behind.. the perfect distance to give the stone enough time to rise? I'm going back to tailgating or hanging waay back..

03-15-2011, 10:58 PM	#23
k44ENT Lieutenant Colonel 492 Rep 1,503 Posts Drives: M2 LCI DCT Join Date: Jun 2009 Location: UK iTrader: (2)	Remember the stone in question has probably been flicked up by another vehicle and will therefore be travelling at a certain speed and therefore has kinetic energy. The speed the stone is travelling combined with the speed you are travelling is the impact speed on the screen. The screen has to absorb the energy in the travelling stone (kinetic energy) which it does in the form of noise and impact damage to the screen. I still maintain that the car is prone to chips, whether it be aerodynamics or just the sheer size of the thing? Also a certain amount of luck is involved because the stone has to be there in the first place so no stray stones from other cars = no chips!
	Appreciate 0 Quote

03-16-2011, 04:04 PM	#26
jangof10 New Member 0 Rep 10 Posts Drives: 2011 550xi, Carbon Black Join Date: Feb 2011 Location: Calgary iTrader: (0)	I have been watching this post for the last couple of days. Stone chips are defiantly top of mind right now for me as well. We are finally starting to get some melting on the roads where I live (Calgary) and 4 months of grit and debris is flying all over the roads. I got my first to major stone hits on my front window last weekend. I was driving back from the mountains and got hit by stones twice. Happily the noise was the worst part and the window did not crack. When I purchased the car I did get the 3M paint protection film(sometimes called a 'Clear Bra') applied to the car. This is supposed to stop any rock chips in the paint. So far so good. __________________ 2011 550i xDrive(Build Week 40), Carbon Black/Oyster Napa, Packages: M Sport, Executive, Dynamic Handling, Technology. Tint Llumar - Sides 35%, Rear 20%
	Appreciate 0 Quote

03-16-2011, 06:19 PM	#27
SpawneyGet Private 5 Rep 94 Posts Drives: F10 535d M Sport Join Date: Jan 2011 Location: UK iTrader: (0)	Not just grit but bits of the road from the numerous potholes from extra cold winter here in England this winter. Our roads probably aren't designed to withstand these recent low temperatures. And when are they bloody going to get round to getting them fixed? Blink an eye and I am in one and my beautiful new wheels are damaged! Perhaps never, with the cuts we are having...
	Appreciate 0 Quote

03-17-2011, 01:28 AM	#28
tallshorty Private 18 Rep 82 Posts Drives: 2011 535xi Join Date: Nov 2010 Location: Canada iTrader: (0)	I got a chip on my hood and right fender, and two chips on the windshield 2 weeks after getting the car. Wish I had installed clearbra from the getgo. Brought my car into the insurance company and they will pay for a new windshield and repaint the hood and right fender for $300 deductible ($1800 estimated cost). Not a bad deal. Doesn't affect my premium. Didn't know they would cover this. Had I known, I would've waited a few more years to collect more dings and chips and claim it all at once. Now I got some chips on the bumper too. Oh well. I'm learning to live with it now.
	Appreciate 0 Quote

05-10-2011, 07:32 AM	#30
Shake n Bake First Lieutenant 21 Rep 306 Posts Drives: F11 520d M-Sport Prof Media Join Date: Dec 2010 Location: England iTrader: (0)	A couple of months on and 5500 miles on the clock....I have had just 1 more occurance. So bye bye sexy aerodynamic issue question and hello mundane dirty winter roads explanation.
	Appreciate 0 Quote

05-10-2011, 09:07 AM	#31
Whteverjklasdf First Lieutenant 20 Rep 301 Posts Drives: . Join Date: Apr 2010 Location: . iTrader: (0)	people get frequent stone chip mostly due to regular tailgating.
	Appreciate 0 Quote