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originally posted by: Blue_Jay33
a reply to: neutronflux
The jet almost crashed on the front lawn.
When you are about to crash in seconds at 500 mph and 20 feet off the ground, what you say is correct "from a certain point of view"
originally posted by: m1kelowry
It is impossible for that type of plane to fly that fast so low to the ground.
originally posted by: m1kelowry
Was he also an expert at avoiding the missile defense systems surrounding the restricted air space?
originally posted by: m1kelowry
a reply to: neutronflux
So Hani Hanjour had the skills to maneuver a commercial jet in a nearly impossible way for an unseasoned, rudimentary pilot that had limited to no skill on his first try into the Pentagon?
Was he also an expert at avoiding the missile defense systems surrounding the restricted air space? That guy is magic I guess.
It is impossible for that type of plane to fly that fast so low to the ground.
The Extent of Ground Effect
Since the ‘lift bonus’ attributable to ground effect is primarily a consequence of a reduction in induced drag, the way in which this changes with height above ground is effectively a proxy for changes in the lift coefficient. As can be seen from the diagram below, induced drag increases non-linearly as the distance from the ground increases and reaches its free air value at a height above ground equivalent to the wing span of a fixed wing aircraft or the rotor diameter of a helicopter. In both cases, this means a rapid drop off of ground effect as height above ground increases so that it is typically reduced to half of the adjacent-to-surface maximum at a height above ground which is equal to 10% of the wing span or rotor diameter, to a quarter of this at a height equivalent to 25% of the wing span or rotor diameter and to 10% of it by the time this height is equivalent to 90% of the wingspan or rotor diameter. The detail, but not the principle, of this height-based change in ground effect will be affected by the extent to which a wing is swept back.
originally posted by: m1kelowry
a reply to: neutronflux
So Hani Hanjour had the skills to maneuver a commercial jet in a nearly impossible way for an unseasoned, rudimentary pilot that had limited to no skill on his first try into the Pentagon?
Was he also an expert at avoiding the missile defense systems surrounding the restricted air space? That guy is magic I guess.
It is impossible for that type of plane to fly that fast so low to the ground.
originally posted by: m1kelowry
a reply to: waypastvne
I read this while trying to verify remarks made by a poster.
originally posted by: Pilgrum
originally posted by: m1kelowry
It is impossible for that type of plane to fly that fast so low to the ground.
Well obviously not impossible because it actually did that very thing. If we follow the twisted logic suggested then all pilots could avoid crashing by simply going fast enough?
I don't see it as an impossible manoeuvre to point the nose at such a large building and max out the throttles. Even if ground effect was a (very short time like 2 seconds) issue it's not going to be sufficient to make the plane clear the building.
'The staff thought he was a very nice guy, but they didn't think his English was up to level,'' said Marilyn Ladner, a vice president at the Pan Am International Flight Academy, which operated the center in Phoenix. Ms. Ladner said that the F.A.A. examined Mr. Hanjour's credentials and found them legitimate and that an inspector, by coincidence, attended a class with Mr. Hanjour. The inspector also offered to find an interpreter to help Mr. Hanjour, she said.