Mal ne Interessante Darstellung aus dem Loose Change-Forum:
Zitat:
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No. It was not Boeing 757. Why ? Simply because it is impossible.
Read thisarticle, very interesting: The Impossibility of Flying Heavy Aircraft Without Training(
http://www.bcrevolution.ca/no_pilot_training.htm (Archiv-Version vom 30.05.2006))
Now he say about flight 77:
I shan’t get into the aerodynamic impossibility of flying a large commercialjetliner 20 feet above the ground at over 400 MPH. A discussion on ground effect energy,tip vortex compression, downwash sheet reaction, wake turbulence, and jetblast effectsare beyond the scope of this article (the 100,000-lb jetblast alone would have blownwhole semi-trucks off the roads.)
Let it suffice to say that it is physicallyimpossible to fly a 200,000-lb airliner 20 feet above the ground at 400 MPH.
Theauthor, a pilot and aeronautical engineer, challenges any pilot in the world to do so inany large high-speed aircraft that has a relatively low wing-loading (such as acommercial jet). I.e., to fly the craft at 400 MPH, 20 feet above ground in a flattrajectory over a distance of one mile.
Why the stipulation of 20 feet and amile? There were several street light poles located up to a mile away from the Pentagonthat were snapped-off by the incoming aircraft; this suggests a low, flat trajectoryduring the final pre-impact approach phase. Further, it is known that the craft impactedthe Pentagon’s ground floor. For purposes of reference: If a 757 were placed on theground on its engine nacelles (I.e., gear retracted as in flight profile), its nose wouldbe almost 20 above the ground! Ergo, for the aircraft to impact the ground floor of thePentagon, Hanjour would have needed to have flown in with the engines buried 10-feet deepin the Pentagon lawn. Some pilot.
At any rate, why is such ultra-low-levelflight aerodynamically impossible? Because the reactive force of the hugely powerfuldownwash sheet, coupled with the compressibility effects of the tip vortices, simply willnot allow the aircraft to get any lower to the ground than approximately one half thedistance of its wingspan—until speed is drastically reduced, which, of course, is whathappens during normal landings.
