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ACCURACY!!!
On Sept. 10, Secretary of Defense Donald Rumsfeld declared war. Not on foreign terrorists, "the adversary's closer to home. It's the Pentagon bureaucracy," he said.
Rumsfeld promised change but the next day – Sept. 11-- the world changed and in the rush to fund the war on terrorism, the war on waste seems to have been forgotten.
"According to some estimates www.cbsnews.com..." target="_blank" class="postlink" rel="nofollow"> we cannot track $2.3 trillion in transactions," Rumsfeld admitted.
$2.3 trillion — that's $8,000 for every man, woman and child in America. (CBS)
- The impact area included both the Navy operations center and the office complex of the National Guard and Army Reserve. It was also the end of the fiscal year and www.arlingtonva.us..." target="_blank" class="postlink" rel="nofollow"> important budget information was in the damaged area. (Arlington County After-Action Report)
- Most of those killed in the office, called Resource Services Washington, www.s-t.com..." target="_blank" class="postlink" rel="nofollow"> were civilian accountants, bookkeepers and budget analysts. They were at their desks when American Airlines Flight 77 struck. (South Coast Today)
Originally posted by Masisoar
The only problem I see with the whole "757 not hitting the Pentagon issue" is where the plane went? Are there any accounts of seeing the plane anywhere else after it took off?
Originally posted by watch_the_rocks
Good post, but I can't accept the argument of accuracy. Those aircraft manage to land on runways, and the sweet spot to hit a runway is comparable to the pentagons side.
So, you see, this argument of 'accuracy' is not very convincing.
Originally posted by watch_the_rocks
Ahh, yes, that is a much better comparison.
btw, 757's don't use fly-by-wire controls (ta zaph), but the controls are fully hydraulically assisted. So whatever the pilot does, the plane does; which is unlike the FBW systems, where a computer analyses every move the pilot makes (yes, making it much easier to hit a building).
Originally posted by tuccy
But even then the hydraulic assist makes steering (and thus hitting) much easier than WWII steering mechanisms.
Originally posted by tuccy
A better comparison than landing on the carrier would be a Kamikaze attack on one of those. Or even on a destroyer or minesweeper. Heck, there was even Kamikaze attack on a landing boat if you want accuracy. And in many cases the planes were flown by pilots with even less training than 0911 hijackers, in dive reaching comparable speeds to the 757 maximal, without any computer-assisted Fly-by-wire system, they had to use real physical strength to steer the craft at high speeds and guess what, they were hitting targets sometimes. I'd guess the 757 has many obstacles removed (for example you don't have to concentrate so much on the force applied to controls etc.). It is indeed possible to hit such a target as the Pentagon.
Originally posted by watch_the_rocks
Meh. 158 mph is average landing speed as far as I can work out. Add another 342, and you'll have your impact speed. All it means is less reaction time. I'm not sure if this is a great comparison, but fighter pilots managed to maneuver their planes exactingly all through the 20th century with bugger all reaction time at speeds far greater than 500mph, so if we now move on to a much more clumsy aircraft at a slower speed it translates nicely.
Yeah, all speed is is reaction time. Aim it right, and you'll make the govt. happy.
Originally posted by watch_the_rocks
It would perhaps be better if you made your mind up about what the thread is about before you start it. We're now talking about pilot mentality? Coulda sworn this was about technical feasibility . . . and if it is, perhaps this image would be a better one to illustrate my point, and not your image of a tiny little wall thrown against Washington's massive backdrop:
This question of whether an amateur could have flown Flight 77 into the Pentagon was also posed to a colleague who previously worked on flight control software for Boeing airliners. Brian F. (he asked that his last name be withheld) explained, "The flight control system used on a 757 can certainly overcome any ground effect. ... That piece of software is intended to be used during low speed landings. A high speed dash at low altitude like [Flight 77] made at the Pentagon is definitely not recommended procedure ... and I don't think it's something anyone specifically designs into the software for any commercial aircraft I can think of. But the flight code is designed to be robust and keep the plane as safe as possible even in unexpected conditions like that. I'm sure the software could handle that kind of flight pattern so long as the pilot had at least basic flight training skills and didn't overcompensate too much."
Brian also consulted with a pair of commercial airline pilots who decided to try this kind of approach in a flight training simulator. Although the pilots were not sure the simulator models such scenarios with complete accuracy, they reported no significant difficulties in flying a 757 within an altitude of tens of feet at speeds between 350 and 550 mph (565 to 885 km/h) across smooth terrain. The only issue they encountered was constant warnings from the simulator about flying too fast and too low. These warnings were expected since the manufacturer does not recommend and FAA regulations prohibit flying a commercial aircraft the way Flight 77 was flown. These restrictions do not mean it is impossible for a plane to fly at those conditions but that it is extremely hazardous to do so, and safety was obviously not a concern to the terrorists on September 11. An aircraft flying at those high speeds at low altitude would also likely experience shaking due to the loads acting on it, but commercial aircraft are designed with at least a 50% safety margin to survive such extremes.
One of the pilots summarized his experiences by stating, "This whole ground effect argument is ridiculous. People need to realize that crashing a plane into a building as massive as the Pentagon is remarkably easy and takes no skill at all. Landing one on a runway safely even under the best conditions? Now that's the hard part!" While he may have been exaggerating a bit for effect, he does raise a valid point that flying skillfully and safely is much more difficult than flying as recklessly as the terrorists did on September 11
Originally posted by diggs
I'd love to see a 757 try to land at over 500mph, especially with a pilot with the feelings of about to die.