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<blockquote data-quote="soberups" data-source="post: 1830865" data-attributes="member: 14668"><p>When the Towers were designed and built in 1970, the biggest jet airliner in existence at the time was the Boeing 707 and it was assumed that a collision involving a 707 and one of the Towers would occur at normal landing and takeoff speeds....approximately 200 MPH.</p><p></p><p>The Boeing 767's that struck the Towers on 9-11 were significantly larger and heavier than a 707 and carried half again as much fuel on board. They were also traveling at almost 3 times the velocity (550MPH) as would be expected during landing or takeoff.</p><p></p><p>If your house was designed to withstand an impact from an economy car striking it at 20MPH, would you realistically expect it to withstand the impact of a fully loaded 18-wheel semi truck going 55 MPH? No.</p></blockquote><p></p>
[QUOTE="soberups, post: 1830865, member: 14668"] When the Towers were designed and built in 1970, the biggest jet airliner in existence at the time was the Boeing 707 and it was assumed that a collision involving a 707 and one of the Towers would occur at normal landing and takeoff speeds....approximately 200 MPH. The Boeing 767's that struck the Towers on 9-11 were significantly larger and heavier than a 707 and carried half again as much fuel on board. They were also traveling at almost 3 times the velocity (550MPH) as would be expected during landing or takeoff. If your house was designed to withstand an impact from an economy car striking it at 20MPH, would you realistically expect it to withstand the impact of a fully loaded 18-wheel semi truck going 55 MPH? No. [/QUOTE]
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