Would ground effect and FOD ingestion be factors at high speeds close to the ground?
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
edited 33 mins ago
Jimy
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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
edited 33 mins ago
Jimy
1,42621227
asked 3 hours ago
Rcihard Van Steenberg
121
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
edited 33 mins ago
Jimy
1,42621227
asked 3 hours ago
Rcihard Van Steenberg
121
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
edited 33 mins ago
Jimy
1,42621227
asked 3 hours ago
Rcihard Van Steenberg
121
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edited 33 mins ago
Jimy
1,42621227
asked 3 hours ago
Rcihard Van Steenberg
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edited 33 mins ago
Jimy
1,42621227
edited 33 mins ago
Jimy
1,42621227
edited 33 mins ago
Jimy
1,42621227
1,42621227
asked 3 hours ago
Rcihard Van Steenberg
121
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 3 hours ago
Rcihard Van Steenberg
121
asked 3 hours ago
Rcihard Van Steenberg
121
121
New contributor
Rcihard Van Steenberg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor
Rcihard Van Steenberg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Rcihard Van Steenberg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
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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 2 hours ago
niels nielsen
2,0491515
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 2 hours ago
Tanner Swett
1,6041726
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
2 hours 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 2 hours ago
niels nielsen
2,0491515
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 2 hours ago
niels nielsen
2,0491515
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 2 hours ago
niels nielsen
2,0491515
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 2 hours ago
niels nielsen
2,0491515
answered 2 hours ago
niels nielsen
2,0491515
answered 2 hours ago
niels nielsen
2,0491515
answered 2 hours ago
niels nielsen
2,0491515
2,0491515
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 2 hours ago
Tanner Swett
1,6041726
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
2 hours 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 2 hours ago
Tanner Swett
1,6041726
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
2 hours 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 2 hours ago
Tanner Swett
1,6041726
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 2 hours ago
Tanner Swett
1,6041726
answered 2 hours ago
Tanner Swett
1,6041726
answered 2 hours ago
Tanner Swett
1,6041726
answered 2 hours ago
Tanner Swett
1,6041726
1,6041726
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
2 hours ago
add a comment |
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
2 hours ago
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
2 hours ago
Might want to compare SilkAir Flight 185 (even though that particular case is disputed).
– a CVn
2 hours 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.
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