That old myth about holding your hand against the windscreen!!

Submitted: Sunday, Apr 20, 2008 at 18:50
ThreadID: 56821 Views:10805 Replies:7 FollowUps:18
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Does holding your hand against the windscreen help avoiding a broken screen when the rocks start flying!? when on new road works etc.?, Or is it just a nervous reaction?, I usually put a hand up hoping to hell nothing happens...lol.


Cheers Axle.
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Reply By: The Explorer - Sunday, Apr 20, 2008 at 19:06

Sunday, Apr 20, 2008 at 19:06
Hello - only for the old unlaminated screens which bleep ter. Has no effect on current laminated screens unless its a huge rock and your trying to catch it:)

Cheers
Greg
I sent one final shout after him to stick to the track, to which he replied “All right,” That was the last ever seen of Gibson - E Giles 23 April 1874

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AnswerID: 299476

Reply By: Member - Phil G (SA) - Sunday, Apr 20, 2008 at 19:17

Sunday, Apr 20, 2008 at 19:17
Yep. Agree with Explorer.... its an old myth for the old windscreens. Laminated windscreens became commonplace in the late 1970's. These days all you can do is pull over as far to the left, and slow YOUR vehicle down.
AnswerID: 299484

Follow Up By: Member - Axle - Sunday, Apr 20, 2008 at 19:41

Sunday, Apr 20, 2008 at 19:41
Hi Phil, know what your saying!, Some old habbits are hard to forget!.

Cheers Axle.
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Reply By: derf - Sunday, Apr 20, 2008 at 19:26

Sunday, Apr 20, 2008 at 19:26
hi axle
as regards to your question ,i dont put my hands on the windscreen to prevent damage from flying rocks as most modern vehilces have a rubber stopper on the back off the windscreen re view mirror which seems to do the same job as your hand and also using your hand is dangerous as if a big rock hits your sceen that hard and breaks it while you are pressing against it ,you could finish up with a badley cut hand or wrist, most modern screens will only crack when hit
hope it helps

regards
derf
AnswerID: 299486

Reply By: obee - Sunday, Apr 20, 2008 at 19:38

Sunday, Apr 20, 2008 at 19:38
A firearms expert once told me and others being instructed that windscreens will stop bullets unless you are in a movie.

Dont try this at home! (as if you would) he he.

owen
AnswerID: 299493

Follow Up By: Vince NSW - Sunday, Apr 20, 2008 at 19:40

Sunday, Apr 20, 2008 at 19:40
Bull. You can stand behind the windscreen if you like. Iwill be going for a lot more cover that that
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Follow Up By: Member - Axle - Sunday, Apr 20, 2008 at 19:47

Sunday, Apr 20, 2008 at 19:47
Yep, agree Vince!, Will be hiding behind you!.....hahahaha.


Cheers Axle.
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Follow Up By: Member - Footloose - Sunday, Apr 20, 2008 at 20:00

Sunday, Apr 20, 2008 at 20:00
I have to agree that's rubbish.
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Follow Up By: Vince NSW - Sunday, Apr 20, 2008 at 20:02

Sunday, Apr 20, 2008 at 20:02
One of the hardest thing I had to do when trying to train young soldiers in infantry tactics, was to get them to understand that (in those days) a 7.62 round would go thru 8 inches of hard wood & take them out on the other side. A very deep hole with overhead protection will do me every time.
Vince
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Follow Up By: Rock Crawler - Sunday, Apr 20, 2008 at 20:11

Sunday, Apr 20, 2008 at 20:11
Guys I wouldnt be so quick to laugh at what OBEE said. What do you thing side bullet proof windows are ? Laminated glass. Windscreen can stop a bullet but yet it does depend on the range and ballistic Type agreed . But then again Bullet proof windows are there for the first shot anyway, they buy you enough time to try drive away as a second shot will penetrate with no issues.
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FollowupID: 565686

Follow Up By: John R (NSW) - Sunday, Apr 20, 2008 at 20:28

Sunday, Apr 20, 2008 at 20:28
Actually, the vinyl interlayers are just as important in stopping the bullet/s as the thickness of the glass involved. It's not just the "quality" of the bullet that will determine whether the glass will be fully penetrated.

One single .76mm interlayer (as found on a conventional windscreen) has enormous strength. Bulletproof glass usually has at least 3 interlayers ov varying thicknesses.
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FollowupID: 565694

Follow Up By: Vince NSW - Sunday, Apr 20, 2008 at 20:28

Sunday, Apr 20, 2008 at 20:28
Bullet proof windows are about 3 time the thickness of a windscreen. Have a look next time your in the bank. They are also made up of multi layered laminations.
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Follow Up By: Member - Paul C (NSW) - Sunday, Apr 20, 2008 at 21:45

Sunday, Apr 20, 2008 at 21:45
I remember a show on the ABC a year or so ago where an Aussie inventor had come up with a bullet-proof glass that had reduced thickness due to the way it was laminated ( Don't remember the exact details)
This fella wanted to test his glass by standing behind whilst a team of marksmen fired innumerable rounds in his direct direction! Australian law dictated that it could not be done here so he went overseas ( Israel I think) and did it.
From memory all went well.

Now that's believing in your product.
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FollowupID: 565710

Follow Up By: Mick15 - Sunday, Apr 20, 2008 at 21:55

Sunday, Apr 20, 2008 at 21:55
most of the stuff in the banks is lexan which is polycarbonate, same sort of stuff that lightforce are made from.
we use it at work for macine gaurds upto about 12mm and its pretty much indestructable, thinner stuff can also be bent like sheet metal without heat, can't use glass as its a food factory.
Will have to get an offcut and ping it with the .22-250 and see what happens.
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Follow Up By: Member - Mike DID - Sunday, Apr 20, 2008 at 22:35

Sunday, Apr 20, 2008 at 22:35
Bullet-proof glass for armoured cars is 2 to 3 cm thick !
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Follow Up By: MARIC - Sunday, Apr 20, 2008 at 22:35

Sunday, Apr 20, 2008 at 22:35
Hi Mick15,
I totally agree with you. Saw a documentary on foxtel re windows on vehicles and the product is lexan ... spot on, but thickness i don't know...... my .243 rifle goes thru plough disc at 300m using 70grain hollowpoints
It is only when you see mosquito land on your testicles that you find another way to solve problems without violence

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Follow Up By: pop2jocem - Sunday, Apr 20, 2008 at 23:03

Sunday, Apr 20, 2008 at 23:03
I had the opportunity to ride in a Landcruiser wagon recently that had been modified all round to provide protection from shrapnel and bullets. I was told that the windscreen would take repeated hits from point blank range wth 7.62 cartridges. I was also told that that particular screen would cost 10,000 euros to replace

Cheers Pop
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FollowupID: 565738

Reply By: John R (NSW) - Sunday, Apr 20, 2008 at 20:20

Sunday, Apr 20, 2008 at 20:20
As a former automotive glass worker I can safely say "myth busted" to both holding your hand against a zone toughened windscreen, and the bullet theory.

A few people got very rich in the 60's & 70's from selling those converted drain plungers that some people stuck on the back of their windscreens to allegedly save their glass.

The reason mirrors are attached via the windscreen on come cars nowadays has nothing to do with strengthening the glass, but purely cost. It's cheaper to glue a bracket onto the windscreen than to engineer it into the turret.

A zone toughened windscreen is actually stronger than a laminated windscreen if hit front-on. The difference is it bleep ters. It's weak spot is actually on the edge (across its thickness) and it is actually weaker than laminated glass if struck there. Pretty hard to hit it there because most ZT glasses of that era had their edges concealed under trims.
AnswerID: 299509

Follow Up By: Member - Axle - Sunday, Apr 20, 2008 at 20:47

Sunday, Apr 20, 2008 at 20:47
Hi john, I think you have answered my question so far....Lol.


Thanks Axle.
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Reply By: Best Off Road - Sunday, Apr 20, 2008 at 20:39

Sunday, Apr 20, 2008 at 20:39
As a lad working in a car yard back in 77 I was instructed to smash tne windscreen on a car that was to be reposessed.

I duly stood on the bonnet and tried to kick it in. Nearly broke my ankle trying.

We eventually managed to bend it in with a sledge hammer but couldn't break it.

The modern (post 1975) laminated windscreen is almost indestructable.

It does however have its limitations. Some stupid kids recently dropped boulders from a freeway bridge and a chap was killed. A large rock dropping at 120 km/h hitting the windscreen of a car doing 100 km/h in the oposite (well nearly) direction will break one as will a motorcyle coming through.

Jim.

AnswerID: 299513

Follow Up By: geocacher (djcache) - Sunday, Apr 20, 2008 at 23:44

Sunday, Apr 20, 2008 at 23:44
A self driving centre punch will safely reduce a windscreen or side window to the sum of it's parts while leaving it intact with one click even on the lowest setting.

I carry one to use when I can't access a patient after a prang. I've used it several times to very good effect.

Dave
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FollowupID: 565743

Follow Up By: geocacher (djcache) - Sunday, Apr 20, 2008 at 23:47

Sunday, Apr 20, 2008 at 23:47
A self driving centre punch will safely reduce a windscreen or side window to the sum of it's parts while leaving it intact with one click even on the lowest setting.

I carry one to use when I can't access a patient after a prang. I've used it several times to very good effect.

Dave
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FollowupID: 565744

Follow Up By: Member - Mark E (VIC) - Monday, Apr 21, 2008 at 09:26

Monday, Apr 21, 2008 at 09:26
Dave,

I've tried this as well and it works well on rear 'windscreens' and side windows, but no way will one of these things bleep ter a laminated windscreen.... Is that what you mean?

Cheers,

Mark
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FollowupID: 565769

Follow Up By: geocacher (djcache) - Monday, Apr 21, 2008 at 12:48

Monday, Apr 21, 2008 at 12:48
Oops. Didn't write that very well did I. Yeah rear windscreen or side windows.

I've not tried it on a front windscreen but I would anticipate that it would just bullseye like it does when a stone hits it.

Dave
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FollowupID: 565793

Reply By: Member - Poppy (QLD) - Monday, Apr 21, 2008 at 17:39

Monday, Apr 21, 2008 at 17:39
Axle
The only reason you put your hand against the windscreen (unlaminated type) was to stop it falling in on you when it shattered, otherwise it has no positive effect at all.
Cheers Ray
AnswerID: 299669

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