Everyone, I’m pretty sure that what our new friend is saying here is that in the video of the 767 hitting the South Tower, you don’t notice a significant deceleration after the nose starts hitting the wall - the tail seems to continue at the same speed until it too hits the wall. Now let’s go through the physics of that.
The plane was reported to be going what, 540 mph? That’s around 800 ft/sec. If the plane was about 150 ft long, then it travels its length in 190 ms. Now here’s how to estimate how much we’d expect the tail to slow down once the nose has impacted the wall: imagine you’re at the tail of the plane, and the other end of the plane gets a large force exerted on it. How much force can it transmit through the body of the plane to where you are? The plane isn’t infinitely strong - as a rough guess, we can say that maybe 10 g’s of acceleration is all the frame could transmit - the front of the plane is decelerating more quickly as it hits the wall, but the material between it and the tail can only take 10 g’s.
So the question is: how much will the tail of the plane slow down in that ~190 ms if it’s being decelerated at 10 g’s? The answer is 10 * 32 ft/s^2 * 0.19 s, or about 60 ft/s. So the tail of the plane would slow down from 800 ft/s to about 740 ft/s.
Jay_Jay, do you really expect to be able to notice this kind of change on the video?
Again: the survivors from Stairwell B reported only hearing the sound of Tower One collapsing above them, not one word about hearing any explosive charges being set off. Nothing about being burned by thermite charges, either.
OK
oh science guy, what happens to an airliner traveling at 800 ft/sec
and encountering an obstacle that is 2% of its own mass?
there will be a jolt as the airliner overcomes the inertia of said mass
and of what magnitude would this jolt be?
The Towers were not a monolithic mass. There’s a large portion of open space. The facade the planes hit would not deliver force to the core nor were they reinforced by the core.
The plane won’t overcome the inertia otherwise the Towers would have been pushed over at impact.
Instead, the planes delivered their energy to the building by both friction and impact.
Czarcasm, the name of this fallacy (from maybe 10 pages back) is Argumentum ad AlexJonesium. Argumentum ad Infowarsium is also acceptable.
Jay_Jay, I’d like to thank you for this thread. You’ve managed to bring together all of the SDMB, regardless of race, creed, religion, or political affiliation onto one side of an issue.