Quote:
Originally Posted by JohnnyClips
Towers were designed for lots of planes to crash into them and not be bothered at all
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My car is designed to withstand a head on collision at 30mph. But the same collision at 70mph, and well, all bets are off. And being built to withstand an impact of a certain size doesn't guarantee it's safe.
The towers were built to withstand in impact of a 1960s 707 at 180mph. While the size and weight of the 767 planes that hit WTC towers, there is a staggering difference here - The 767 went into service twenty years after the 707 planes, were much stronger, and different aviation fuel than existed in the 1960s when the towers were built. Also, the original study didn't factor in that people would intentionally slam planes into the towers - It was expected the planes would be doing under 200mph, not the 500mph when the planes hit.