Babe Ruth, on 24 February 2012 - 03:36 PM, said:
With 10 years of fixed-wing crop dusting sir, it is most likely that I have spent more time in ground effect than you have. And I assure you that coming out of a 4000FPM descent and attempting to transition to terrain following flight is a sure recipe for disaster.
About that ground effect.
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Ground effect and the B-747
Meanwhile, the ground-effects issue that emerges when the airplane is close to the surface after takeoff and prior to landing, was also explored. Test pilots over several days in October commanded the 747-8 Freighter to basically hover over the runway.
My link
In the case of American 77, it was a disaster. Remember, the terrorist wasn't interested in landing the B-757. In regards to your comment of 4000 fpm, Travis AFB, which flies the C-5, KC-10, and the C-17, has authorized its aircraft to conduct tactical maneuvers of up to 10,000 fpm within 12 NM of the base.
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I suspect you already know it, but you are attempting to defend an impossible scenario. The Official Conspiracy Theory is a fable meant for public consumption, and in a rational and intellectually honest discussion, it cannot be defended successfully.
It has been more than 10 years, but you have offered nothing that refutes the official account, so what can you provide that proves that American 77 didn't crash into the Pentagon? Simply saying that a terrorist could not have performed such a maneuver doesn't work. Mathias Rust, who was a student pilot, did what many would have considered impossible, and that is, he flew a C-172 into the Soviet Union and landed in Red Square.
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As for the numbers, you really should revisit PFT and check out their calculations. Straightforward calculations, including pictures for the doubtful amongst us.

The PFT web site is a joke and BooN, and others have made a mockery of PFT. Perhaps, you should have seen the debates between them and Rob Balasamo of PFT.
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I'm no Boeing pilot, and I assume that like other jets the trim is controlled NOT by a trim wheel such as in a Cessna or Piper, but by one of the several buttons or rocker switches on the control wheel. I wonder how long it took that Ace Hanjour to discover that, and use it judiciously?
If would have taken him less than 2 minutes to figure out the trim on a B-757, and trimming an aircraft is not difficult.
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You're talking theory MID, I'm talking about how the average 300 hour pilot would do, placed in a transport airplane that he had NEVER flown before.
Apparently, he knew enough to strike the Pentagon with a B-757, as confirmed by the operator of American 77.
Edited by skyeagle409, 24 February 2012 - 07:50 PM.