Flight 77 flight dynamics assement
How could flight 77 into the pentagon overcome the compression lift of the ground effect at 460 KIAS that close to the ground? Also wouldn't the engines ingest FOD at that power setting that close to the ground on the approach?
ground-effect boeing-757
asked 1 hour ago
Rcihard Van Steenberg
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How could flight 77 into the pentagon overcome the compression lift of the ground effect at 460 KIAS that close to the ground? Also wouldn't the engines ingest FOD at that power setting that close to the ground on the approach?
ground-effect boeing-757
asked 1 hour ago
Rcihard Van Steenberg
111
New contributor
Rcihard Van Steenberg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
How could flight 77 into the pentagon overcome the compression lift of the ground effect at 460 KIAS that close to the ground? Also wouldn't the engines ingest FOD at that power setting that close to the ground on the approach?
ground-effect boeing-757
asked 1 hour ago
Rcihard Van Steenberg
111
New contributor
Rcihard Van Steenberg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
How could flight 77 into the pentagon overcome the compression lift of the ground effect at 460 KIAS that close to the ground? Also wouldn't the engines ingest FOD at that power setting that close to the ground on the approach?
ground-effect boeing-757
ground-effect boeing-757
asked 1 hour ago
Rcihard Van Steenberg
111
New contributor
Rcihard Van Steenberg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
Rcihard Van Steenberg
111
New contributor
Rcihard Van Steenberg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
Rcihard Van Steenberg
111
New contributor
Rcihard Van Steenberg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
Rcihard Van Steenberg
111
asked 1 hour ago
Rcihard Van Steenberg
111
111
New contributor
Rcihard Van Steenberg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Rcihard Van Steenberg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Rcihard Van Steenberg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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2 Answers
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The amount of time a plane in a dive spends close enough to the ground to ingest foreign objects and thereby damage its engines is of order ~fractions of a second.
For a plane that is about to strike a building on the ground, the idea of FOD damage to its engines is not even irrelevant.
answered 29 mins ago
niels nielsen
2,0291515
add a comment |
How could flight 77 into the pentagon overcome the compression lift of the ground effect at 460 KIAS that close to the ground?
Pitch. If an airplane's nose is low enough, it will descend and eventually collide with the ground.
In the extreme example, with the nose pointed directly down, lift is no longer holding the airplane up at all; the only force keeping the airplane's descent in check is drag. I don't know exactly how fast the plane will end up descending, but it will be pretty dang fast.
But an airplane doesn't need to be pointed straight down to have a violent collision with the ground. A shallower pitch will also work.
answered 1 hour ago
Tanner Swett
1,5841726
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
1 hour ago
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
The amount of time a plane in a dive spends close enough to the ground to ingest foreign objects and thereby damage its engines is of order ~fractions of a second.
For a plane that is about to strike a building on the ground, the idea of FOD damage to its engines is not even irrelevant.
answered 29 mins ago
niels nielsen
2,0291515
add a comment |
The amount of time a plane in a dive spends close enough to the ground to ingest foreign objects and thereby damage its engines is of order ~fractions of a second.
For a plane that is about to strike a building on the ground, the idea of FOD damage to its engines is not even irrelevant.
answered 29 mins ago
niels nielsen
2,0291515
add a comment |
The amount of time a plane in a dive spends close enough to the ground to ingest foreign objects and thereby damage its engines is of order ~fractions of a second.
For a plane that is about to strike a building on the ground, the idea of FOD damage to its engines is not even irrelevant.
answered 29 mins ago
niels nielsen
2,0291515
The amount of time a plane in a dive spends close enough to the ground to ingest foreign objects and thereby damage its engines is of order ~fractions of a second.
For a plane that is about to strike a building on the ground, the idea of FOD damage to its engines is not even irrelevant.
answered 29 mins ago
niels nielsen
2,0291515
answered 29 mins ago
niels nielsen
2,0291515
answered 29 mins ago
niels nielsen
2,0291515
answered 29 mins ago
niels nielsen
2,0291515
2,0291515
add a comment |
add a comment |
How could flight 77 into the pentagon overcome the compression lift of the ground effect at 460 KIAS that close to the ground?
Pitch. If an airplane's nose is low enough, it will descend and eventually collide with the ground.
In the extreme example, with the nose pointed directly down, lift is no longer holding the airplane up at all; the only force keeping the airplane's descent in check is drag. I don't know exactly how fast the plane will end up descending, but it will be pretty dang fast.
But an airplane doesn't need to be pointed straight down to have a violent collision with the ground. A shallower pitch will also work.
answered 1 hour ago
Tanner Swett
1,5841726
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
1 hour ago
add a comment |
How could flight 77 into the pentagon overcome the compression lift of the ground effect at 460 KIAS that close to the ground?
Pitch. If an airplane's nose is low enough, it will descend and eventually collide with the ground.
In the extreme example, with the nose pointed directly down, lift is no longer holding the airplane up at all; the only force keeping the airplane's descent in check is drag. I don't know exactly how fast the plane will end up descending, but it will be pretty dang fast.
But an airplane doesn't need to be pointed straight down to have a violent collision with the ground. A shallower pitch will also work.
answered 1 hour ago
Tanner Swett
1,5841726
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
1 hour ago
add a comment |
How could flight 77 into the pentagon overcome the compression lift of the ground effect at 460 KIAS that close to the ground?
Pitch. If an airplane's nose is low enough, it will descend and eventually collide with the ground.
In the extreme example, with the nose pointed directly down, lift is no longer holding the airplane up at all; the only force keeping the airplane's descent in check is drag. I don't know exactly how fast the plane will end up descending, but it will be pretty dang fast.
But an airplane doesn't need to be pointed straight down to have a violent collision with the ground. A shallower pitch will also work.
answered 1 hour ago
Tanner Swett
1,5841726
How could flight 77 into the pentagon overcome the compression lift of the ground effect at 460 KIAS that close to the ground?
Pitch. If an airplane's nose is low enough, it will descend and eventually collide with the ground.
In the extreme example, with the nose pointed directly down, lift is no longer holding the airplane up at all; the only force keeping the airplane's descent in check is drag. I don't know exactly how fast the plane will end up descending, but it will be pretty dang fast.
But an airplane doesn't need to be pointed straight down to have a violent collision with the ground. A shallower pitch will also work.
answered 1 hour ago
Tanner Swett
1,5841726
answered 1 hour ago
Tanner Swett
1,5841726
answered 1 hour ago
Tanner Swett
1,5841726
answered 1 hour ago
Tanner Swett
1,5841726
1,5841726
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
1 hour ago
add a comment |
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
1 hour ago
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
1 hour ago
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
1 hour ago
add a comment |
Rcihard Van Steenberg is a new contributor. Be nice, and check out our Code of Conduct.
Rcihard Van Steenberg is a new contributor. Be nice, and check out our Code of Conduct.
Rcihard Van Steenberg is a new contributor. Be nice, and check out our Code of Conduct.
Rcihard Van Steenberg is a new contributor. Be nice, and check out our Code of Conduct.
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