Animavore wrote:psikeyhackr wrote:Animavore wrote:Nice model, but it is not a scale model of the tower, it's not even built in the same way. It is not set on fire. And it is not penetrated by the object hitting it. It's not even hit at the equivalent point near the top. It doesn't prove anything.

Wrong!

It proved that changing the mass and the distribution of mass of a vertical flexible structure changed the behavior of the structure due to a shearing impact.

How?

You need someone to explain inertia and the Conservation of Momentum and Damped Oscillation to you?

If you look in the right place in the NCSTAR1 report on the south tower you will see that it deflected 12 inches at the 70th floor due to the impact of the plane at ~550 mph. What is curious is that the NIST never specifies their computation of the deflection at the 81st floor where the plane hit. They provide a graph of the oscillation for 4 minutes after impact.

The deflection and oscillation of a vertical flexible structure is going to be affected by the mass and strength of the structure. Since a skyscraper must withstand the wind from any direction this had to be analyzed before the building was constructed. Also if you do some research you will find that analysis of the towers was done in the late 90s with accelerometers at the top of the towers. They were designed to sway 36 inches at the top in a 150 mph wind.

My physics demonstration model is not to scale and I never claimed it was. But a truly accurate physics model cannot be done without accurate mass distribution data. So where is it?

psik