Ajax wrote on Sep 15
th, 2019 at 5:25pm:
Tsk Tsk the comparison is in the post above your last post....tsk tsk.............
The big difference is the 767 is 28000 kg (28 tonne) heavier.
Sounds a lot right, do you think 28 tonne could make the difference......???
What about if I tell you that there is a safety factor between 1.5 to 3 built into all structural design.
Do you think that that 28 tonne could still make the difference.....???.....in toppling the buildings.....???
Like I have been saying from the start SIMILAR planes.
The computations would cover the heavier 767 quite easily.
Ask a structural engineer...!!
28 Tons would be equivalent to a loaded semi trailer, how much kinetic energy would a semi trailer weighing 28 tons have while travelling at 500+ Mph? Do you think that would make no difference?
The fact is the buildings did stand up for a while, whatever systems they had to fight the fires were ineffective we could say a total failure as the fires continued to burn until the buildings fell.
I think if they had effective fire fighting systems the buildings would still be there. Heat steel up till it's red hot and it loses most of its strength anyone who did high school metalwork would know this.
You have proven you know nothing about Physics and now you're proving you know nothing about engineering. Planes have a
Factor of Safety around 1.5-2 they need to build them light or they will never get off the ground or have poor payload capacity.
Civil engineers use a
Factor of Safety usually greater than 4-5 which is for static loads that don't move like buildings and bridges, civil engineers don't deal with dynamic loads it is not something they have to consider.
I have posted a Physics paper on the other 9/11 threads that dealt with the buildings falling. When the top of the buildings started to fall it was not going to stop as the kinetic energy of the falling building was huge, you didn't need explosives as the energy levels were equivalent to hundreds of tons of TNT.
When the building started to fall it was no longer a static load case it was a dynamic load what we call a suddenly applied load.
The only concern I have with 9/11 is why did all those Saudis fly out just after it happened.
After the jet fuel burnt off what was the heat source that exceeded fuel burning temps to weaken the massive steel structure?
The WTCs burnt in the top 3rd ...... the Grenfell Tower was entirely engulfed and burnt for 4 hrs longer yet didn't collapse.