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Discussion Starter · #1 ·
You may want to go back and re-read "Bulletproof Glass" first:

http://www.armslocker.com/forums/showthread.php?t=28127

One-way bulletproof glass is simply a modification of conventional bulletproof glass. Used in a car, it resists penetration by bullets fired from the outside, but allows bullets fired from the inside to pass through! This allows the occupants the ability to fire back through their own armor.

A typical configuration of one-way bulletproof glass consists of two layers. The layers are "glued" together. The outer layer is hard and brittle, while the inner layer is thin, soft and tough. For example the outer layer might be glass and the inner layer polycarbonate.

When a bullet strikes from the outside, the glass is held in compression between the bullet and the polycarbonate. The bullet must break many molecular bonds in the hard glass, which is held in place even after it shatters by the polycarbonate inner layer. Breaking these bonds absorbs kinetic energy (energy of velocity) from the bullet.

Bullets fired from the inside easily penetrate the thin polycarbonate inner layer and the brittle glass, which is now held in tension and thus weak.

One-way bulletproof glass manufacturers claim that bullets fired from the inside only lose about 10 percent of their velocity.
 

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I wonder what condition would cause the passengers to fire their weapons through the bullet proof glass from inside the vehicle. The noise and concussion would be horrendous. At the same time they would be destroying the protection the glass affords.

RIKA
 

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That would be a good candidate for a supproessed weapon, and aimed fire, not spraying and praying, as your armor would last longer.

Man I hated to say that. . .
 

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I could see in say,a roadblock situation where there is no fast escape where the vehicles occupants might need to lessen the threat while the driver(hopefully still alive)attempts to extricate the car.Also one where either the driver is killed-preventing a quick escape but where the vehicle is immobilized for a few moments(or more)as he is replaced-or the vehicles engine is stopped.Also while waiting for either backup to catch up or a rescue.

GBullet?I understand what your saying(great topic BTW!)but what happens to the polycarbonate when,in a door "glass" for example,5,10,15,30,or more rounds are fired out through an area of about a square foot when the entire window is only 5-6 sq feet?Between incoming & outgoing rounds is there a rough guess as to how long the "window" will maintain its integrity?I'm assuming only the use of pistol caliber weapons from inside.
 

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Discussion Starter · #5 ·
Sometimes the occupants of an armored car may face a threat that can defeat the armor, for example an RPG or satchel charge. Satchel charges placed on the car in heavy traffic are a common attack in Venezuela. In these cases it may be desirable to shoot back from within the car.

Yes, shooting from within soon negates your own armor. Consider that no armored car can hold out forever. Even the manufacturers of armored cars sometimes state that their product can protect you for only 20-40 seconds in a realistic attack. Think of it like riding a bull...if you last eight seconds, you might get away unhurt.
 
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