Tifoso. Ho detto che pilotare un B-757 è più semplice grazie al sistema FBW, ma cinque pali sono cinque pali, proprio per il discorso 1+1+1=3 che facevi tu.

1+1+1+1+1 = 5

e non mi pare una cosa peregrina immaginare che l'impatto di 5 pali abbia interferito con la stabilità dell'aereo, in un modo che è impossibile sapere: ogni ipotesi vale l'altra.

L'effetto suolo non crea nessun problema, anzi, è un effetto benefico quando si vola alle BASSE velocità, perchè consente di avere portanza anche quando, in assenza dell'effetto suolo, si stallerebbe.

Alle ALTE velocità, l'effetto suolo produce un effetto del tutto trascurabile.

Poi ho già detto che con il sistema FBW, se decidi di scendere di un grado, scendi di un grado. E' il computer che pensa a compensare quello che c'è da compensare.

Peraltro, visto che non ci sono immagini decenti, l'unica via è quella di capire cosa hanno detto i testimoni, e queste dichiarazioni mi sembrano interessanti:

"I saw the plane hit the building. It did not hit the ground first... It did not hit the roof first... It hit dead center on the edge... I was close enough (about 100 feet or so) that I could see the "American Airlines" logo on the tail as it headed towards the building... It was not completely level, but it was not going straight down, kind of like it was landing with no gear down... It knocked over a few light poles on its way..."

"I faced the Westside of the Pentagon directly towards the heliport. The aircraft, looking to be either a 757 or Airbus, seemed to come directly over the annex, as if it had been following Columbia Pike -- an Arlington road leading
to Pentagon. The aircraft was moving fast, at what I could only be estimate as between 250 to 300 knots. All in all, I probably only had the aircraft in my field of view for approximately 3 seconds .The aircraft was at a sharp downward angle of attack, on a direct course for the Pentagon. It was "clean", in as much as, there were no flaps applied and no apparent landing gear deployed. He was slightly left wing down as he appeared in my line of sight, as if he’d just "jinked" to avoid something. As he crossed Route 110 he appeared to level his wings, making a slight right wing slow adjustment as he impacted low on the Westside of the building to the right of the helo, tower and fire vehicle around corridor 5".

"The plane came heading east. Again, it screamed low. You couldn’t even see the plane before it was about, oh 20 feet or so off the ground, screamed across the highway and slammed into the side of the Pentagon."

"Shortly after watching the second tragedy [at the WTC], I heard jet engines pass our building, which, being so close to the airport is very common. But I thought the airport was closed. I figured it was a plane coming in for landing. A few moments later, as I was looking down at my desk, the plane caught my eye.
It didn’t register at first. I thought to myself that I couldn’t believe the pilot was
flying so low. Then it dawned on me what was about to happen. I watched in horror as the plane flew at treetop level, banked slightly to the left, drug it’s wing along the ground and slammed into the west wall of the Pentagon exploding into a giant orange fireball".

"The aircraft was so very low -- as an aircraft would be on its final approach to an
airport. However, if you have watched any aircraft come in for a landing, even though the aircraft is descending, it is angled up slightly. This aircraft was angled downward".

"... I saw the plane coming in slow motion toward my car and then it banked in
the slightest turn in front of me, toward the heliport. In the nano-second that the plane was directly over the cars in front of my car, the plane seemed to be not more than 80 feet off the ground and about 4-5 car lengths in front of me. It was far enough in front of me that I saw the end of the wing closest to me and the underside of the other wing as that other wing rocked slightly toward the ground. I remember recognizing it as an American Airlines plane -- I could see the windows and the color stripes. And I remember thinking that it was just like planes in which I had flown many times ...... The plane seemed to be floating as if it were a paper glider and I watched in horror as it gently rocked and slowly glided straight into the Pentagon. At the point where the fuselage hit the wall, it seemed to simply melt into the building".

E' leggendo queste testimonianze, che mi sono fatto un'idea della velocità e dell'assetto dell'aereo nelle ultime centinaia di metri di volo.