2nd World Trade Plane Fake?

So Googling around as I do after finding the US have released a video of the plane hitting the Pentagon I stumbled up a site putting the theory that the 911 event was faked. In particularly they have Proof That Blue Screen Technology Was Used to Fake the 2nd Plane. So, liking an interesting conspiracy theory as much as the next man I read on negating the fact I saw the 2nd plane hit, with my own eyes, live on BBC news.

One point they hinged on was that the “aircraft weighed approximately 140 tons. This means that 140 tons hit over 3,600 tons of concrete plus all the steel in the pans and exterior columns!” So I decided to do some math! A very infrequent event for me you should know using the numbers they give and let me know if I’m wrong on any point. So, we know that the plane has an estimated weight of 140 tonnes they also state that “The floor systems were approximately 31,000 square feet and had a composite construction with steel beams of 50 ksi yield strength supporting concrete slabs on metal deck, with a floor thickness of 5.5 in.” So we have the weight, I think, of what the plane was hitting. As all good school kids know, that when a mass is travelling at speed (Force = Mass x Acceleration) it packs more of a punch. To the sites credit it does point out “The laws of physics are based on relative motion. A grain of sand moving at high speed in space will punch right through a space craft as it is vaporized. The point is that both objects are subject to the same force.” The aircraft speed, for argument, is thought to be around 450mph.

So here’s my math, 140 x 450mph gives us 63000 tonnes (a lot of wellie!). Now, we’ve been told each floor had 50ksi of yield strength. KSI is kips per square and 1 kip is equal to 1,000 pounds, so each floor had 50,000 pounds of yield strength. So, how much wellie does 63000 tonnes have? Well, first we convert tonnes to pounds and thanks to Google calculator I am reliably informed 63 000 tonnes = 138 891 225 pounds. So to get that into ksi we divide that by 1000 and we get the grand total of 138 892. 225 ksi which is roughly 2.7 times the amount it was meant to take.

Now yes, the plane did hit more than one floor but I’m sorry, I don’t think this is hoaxed and it’s about time you people moved on. From what I gather they’re not disputing the 2nd hit, the one which went out live. It seems they’re only interested in the 1st hit (which was found to have been recorded by a film crew following a fire crew from what I remember) and the Pentagon. Conspiracy theories interest me and sometimes they’re compelling but I really do think this one is just too out there to even consider.