Comparing the Boeing 707 to the 767
This post is in response to MacGyver1968's
post 1533 in this thread.
I've found it frequently better to first only put up the link; many have accused me of spamming when I excerpt relevant portions of a link. So I've been cutting back a bit on excerpting right away, to see if the person I'm talking to actually wants to listen to my argument or whether they simply likes to lecture
.
Anyway, some important facts, taken from whatreallyhappened.com's
Boeing 707 - 767 Comparison article:
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The maximum takeoff weight for a Boeing 707-320B is 336,000 pounds.
The maximum takeoff weight for a Boeing 767-200ER is 395,000 pounds.
The wingspan of a Boeing 707 is 146 feet.
The wingspan of a Boeing 767 is 156 feet.
The length of a Boeing 707 is 153 feet.
The length of a Boeing 767 is 159 feet.
The Boeing 707 could carry 23,000 gallons of fuel.
The Boeing 767 could carry 23,980 gallons of fuel.
The cruise speed of a Boeing 707 is 607 mph = 890 ft/s,
The cruise speed of a Boeing 767 is 530 mph = 777 ft/s.
The Boeing 707 and 767 are very similar aircraft, with the main differences being that the 767 is slightly heavier and the 707 is faster.
Since the Boeing 707 had a higher thrust to weight ratio, it would be traveling faster on take-off and on landing.
The thrust to weight ratio for a Boeing 707 is 4 x 18,000/336,000 = 0.214286.
The thrust to weight ratio for a Boeing 767 is 2 x 31,500/395,000 = 0.159494.
In all the likely variations of an accidental impact with the WTC, the Boeing 707 would be traveling faster. In terms of impact damage, this higher speed would more than compensate for the slightly lower weight of the Boeing 707.
In conclusion we can say that if the twin towers were designed to survive the impact of a Boeing 707, then they were necessarily designed to survive the impact of a Boeing 767.
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It mentions one thing at the beginning of the article that I have doubts about, however:
In 1966, Robertson designed the structural elements of the WTC towers to withstand the impact of the largest airliner then in service, the Boeing 707.
It offers no citation, however. It was my understanding that Skilling did this, not Robertson. Furthermore, 9/11 Research's article
Towers' Design Parameters, brings up the 1964 white paper that I have mentioned in the past, which states:
The buildings have been investigated and found to be safe in an assumed collision with a large jet airliner (Boeing 707—DC 8) traveling at 600 miles per hour. Analysis indicates that such collision would result in only local damage which could not cause collapse or substantial damage to the building and would not endanger the lives and safety of occupants not in the immediate area of impact. 4