Breaking glass ?

shanshui75 said:
though tempered glass shatters nicely when struck in a corner with a center punch (remember that you have to do it in corners of the window, not the center), i suspect that the pressure difference underwater would actually help the process. once the first crack, how can it help but break?
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I think Schwarad meant that a hammer or knife-butt carbide breaker would be hard to use when the car was full or mostly full of water, because of the water's resistance. In that case, the pressures inside and outside would be equalized.
 
Have you all seen the passaic river? You'd have to be in deep to want to swim through that thing to safety.
 
Jesus H. Christ, what a bunch of idiots in that car! There had to be something available in the car that could break glass. Or, they could just roll the windows down and wait for the car to fill with water (unless they had electric windows (poor saps if they did)) Most shoes can break glass if smacked hard enough (although it usually takes 2 hits, don't ask me why), much less a pair of high heels (most likely).
 
People (on lookers) had the tools but never
knew it.

Their wiper blades! Snap it off at base.Remove wiper from arm.

You are left with the arm with a small rounded end piece at a 90 degree angle.

swing (snap) into side glass.

It all can be done in under 10 seconds.
 
you can also use an antenna. works quite well and makes you feel like Macgyver.

another, but potentially costly solution as well, would be to have a submarine car like Bond so in case you decided to drive into a river, or needed to escape from the bad guys, you would have the problem solved. while your at it though, might as well make it fly so that cliffs are covered. maybe a self righting arm to flip it back over, in case that happens. ohh, and it has to have ejector seats.

i think the best advice is to not drive into a river. to quote noaa "turn around, don't drown.

k
 
Steven Roos said:
That is what I was thinking instead of your average hardware store center punch.
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Steven,
I have been a Firefighter for over 17 years, and am our dept's extricaton instructor. I have broken LOTS of glass. Every trick in the book, from antennas, spark plug porceline, center punches, knives, sledge hammers, you name it. This little gizzmo is really sweet. It has a spring loaded center punch on one end, and a seat belt cutter on the other. Goes on the key ring. When needed, you just pull it and it comes off the key ring. Got one for my wife since she doesn't carry a knife etc. At work, I have a spanner wrench with a carbide point built into it. One little tap and away it goes.

Drive safe,
John...
 
Man, what KVC said!

Keeping any sort of these punch tools on your person is best. A larger type somewhere else in the car as well. If suffering from impact, it is more instinctive to locate any of these tools if it is on your person, instead of reaching out for it somewhere on the dash, glove compart, visor, etc. Perhaps storing it in a velcroed belt pouch (along with your other necessities) is a good idea. Requiring only gross motor skills to rip it open and to retrieve. Most of us already carry knives on a daily basis. So that is a plus. Spyderco makes a fine folder- the Assist II with carbide tip breaker. The sheepfoot blade makes a fine emergency cutting tool. I' ve tried the carbide tip glass breaker. And it works just fine. On cars in the junkyard that is! :D

N2
 
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