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Has Anyone Seen A Realistice Explanation For Free Fall Of The Towers?

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Bell said:
Christophera, I ask you to take a look at this videoclip, especially the first few seconds. The inward buckling of the tower is very recognizable, just before the tower begins to fall. Also, the collapse starts first, then we see the smoke and dust rushing out. Not very consistent with a controlled demolition.
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And if you notice when the upper section started to fall it did not move lateraly. It rotated on its center of mass in the direction of the rupturing heat damaged spandrels and box columns and fell straight down. There was no lateral shift of center of mass.
 
rwguinn said:
Well, I was one,and you are correct...
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Wow! Where did you work? Your in Texas so I'm assuming JSC perhaps?
or did you work for a subcontractor? McDonald Douglas? Lockheed Martin? General Dynamics? What was your field of work?

I gots respect for the Rocket Scientists!
 
uruk said:
Wow! Where did you work? Your in Texas so I'm assuming JSC perhaps?
or did you work for a subcontractor? McDonald Douglas? Lockheed Martin? General Dynamics? What was your field of work?

I gots respect for the Rocket Scientists![/quote

spent 4years cooping at NASA, Edwards AFB, and 20 years at Martin Marietta (now Lockheed Martin) in Denver on Titan III, Titan34D, and, of course, STS.
Now I do structural analysis on whatever comes along. Airplanes, at present]
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(Quoted by Christphera)The last significant recall I had was about the 6 inch rebar. I remember marvelling at the amount of work in tight difficult spaces in order to weld 6 inch think deep fillets that were round. A night mare. A zillion passes and chipping runs. No wonder the core foundation took so long went through my mind. The constant objection to my call of 3 inches of the rebar coiled up on top of the core wall at its base bothered me because the thickness really did look larger. then some images of tight intersections of huge rebar popped into my brain from my memory adn the words followed describing the fact that the 6 inch rebar of the foundation had to be welded because it was too thick to bend.
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I wonder how safe it was to weld rebar coated with C4? You figgure there would have been an accidental ignition or two.
 
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uruk said:
I wonder how safe it was to weld rebar coated with C4? You figgure there would have been an accidental ignition or two.
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Especially after they start hitting the fresh welds with a slag hammer.
 
now with the RDX buried in the Concrete core that does not exist, does this mean the RDX does not exist?
 
uruk said:
Awesome! The new Delta4 is something to behold.
http://www.msnbc.msn.com/id/6743383/

Any opinions on the CEV?
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/deail, continued (At least there's no concrete here--yet)
I may have tho oportunity to work on it--probably in systems, if there are openings...
But personally?
We got to get away from this obsession with vertical launch.
Maybe we could use cristophanoid's invisicrete to build a catapault in the Rockies that wouldn't be an environmental disaster?:D
(sorry--I had to have some part of the thread in there, for continuity..)\derail
 
rwguinn said:
/deail, continued (At least there's no concrete here--yet)
I may have tho oportunity to work on it--probably in systems, if there are openings...
But personally?
We got to get away from this obsession with vertical launch.
Maybe we could use cristophanoid's invisicrete to build a catapault in the Rockies that wouldn't be an environmental disaster?:D
(sorry--I had to have some part of the thread in there, for continuity..)\derail
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You mean something like the system used in the movie "When Worlds Collide"?
Would something like that work for heavy payloads like C4 coated rebar and invisicrete?

(We might have to move this to a new thread in a different section if it warrants interest.)
 
uruk said:
You mean something like the system used in the movie "When Worlds Collide"?
Would something like that work for heavy payloads like C4 coated rebar and invisicrete?

(We might have to move this to a new thread in a different section if it warrants interest.)
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I was thinking more like electromagnetic, ala R.A. Heinlein's "The Moon is a Harsh Mistress"
 
uruk said:
You mean like? http://archives.cnn.com/2002/TECH/space/01/03/maglev.launches/index.html
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yup.
The problem is "getting through this pesky atmosphere", and vertical launch is the shortest way through it.
A MAGLEV-type launcherwould have to be a long sucker, though, to keep from the g-levels what kill folks and wreck sensitive electronics (Although random vibration levels would go away, almost!). So, you need a long launch ramp, and aimed awau from the ground, to build up sufficient velocity to punch through the atmosphere.Probably need a rocket boost after leaving the ramp, still--but considerably less of one than now...
 
rwguinn said:
yup.
The problem is "getting through this pesky atmosphere", and vertical launch is the shortest way through it.
A MAGLEV-type launcherwould have to be a long sucker, though, to keep from the g-levels what kill folks and wreck sensitive electronics (Although random vibration levels would go away, almost!). So, you need a long launch ramp, and aimed awau from the ground, to build up sufficient velocity to punch through the atmosphere.Probably need a rocket boost after leaving the ramp, still--but considerably less of one than now...
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How about a combination of propulsion systems.
Use a maglev catapult to achieve the initial velocity. Balance out the acceleration to G-force requirements to achive the minmal rail length then use a laser propulsion system ( http://www.islandone.org/Propulsion/Lsrprp1.gif ) to kick it to escape velocity while still in the atmosphere then switch to liquid propulsion for obit parking. The laser propulsion system would cutdown on the amount of fuel needed to be carried.

But I know. Too much plumbing will get Murphy involved.
 
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uruk said:
I wonder how safe it was to weld rebar coated with C4? You figgure there would have been an accidental ignition or two.
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Not too likely. C4 explodes under heat AND pressure, not heat alone. Or through electrical ignition.

My dad used to cook with the tiniest bit of C4. Then he'd have the n00b lieutenants or whoever stomp it out...

hehehehe
 
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