Mass + Velocity = Crack

[shatto]

I drives a lot.
A bunch of stuff has hit the windscreen.

Everything from bugs to sand to rocks has a unique sound, that changes with the impact point on the glass and the speed I'm driving.
Sometimes the whap! of a bug will make me flinch

Some pieces make a cracking sound to a soft thud. Some, I imagine are like a marble would sound.
A rock that looks the size of a baseball coming at me but is really less than an inch across may leave an ugly dirt mark that, when wiped away leaves only a tiny pock-mark.

Then there was Thursday....
Never saw the culprit, just heard a metallic 'ping' sound that caught my attention just because it was so unusual.
Later, when the light was just so....a crack sprouting straight up from the very bottom of the windshield.

Reflecting on the experience,
I wonder if the combination of the strike location as well as the density and speed of the rock combined to set up a harmonic that cracked the glass.

[ctateusa]

now that is deep, imagine what a 3 inch rock sounds like at 65 thats what i have heard recently. Oh dont price the windshield replacement at toyota. 1300.00 was about what i got as an estimate. Good thing i have a buddy that does windshields 250.00 my price lol

[shatto]

Farmers charges a dollar or three for the glass rider. I can find glass guys who will eat the deductable. Free replacement.

[ctateusa]

yhea i have a 1000.00 deduct for glass. So no help for me lol.

[Shootist]

You can break a windshield with thumb pressure along the edges. Just the nature of the glass. So I would say, yes, the location
of the hit was the cause. Always try and look at a windshield before it's installed. Any chips in the edge can cause it to crack
for no reason.