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How long to clear the 'suck zone' of a turbofan after start is initiated?
The Next CEO of Stack OverflowAre engines automatically stopped in an emergency landing?Why are the engines on the MAX and neo prone to bowing?How long can passengers survive after ditching in the ocean?Why is there no alert if shutting down a running engine during flight?How does the shape of the blades on N1 fan on a turbofan generate thrust?How can cargo be jettisoned from a C-124 in flight?What would have happened if the jet engine on my aircraft had ingested caulk from the pavement?Can we eliminate the center tank of large passenger planes?How is risk managed in single engined piston aircraft flights?What's the name of this component of the turbofan engines?How do you maximize an electric engines thrust?Does the P&W F100 turbofan engine of the F-16 really produce this much power?
$begingroup$
I recently found this (IMO funny) picture. All funny and all. But let's make this a real situation.
Let's suppose I see my crush and his BF doing this, and I come with this 'genius' idea (alright, it's anything but a genius idea, but still) to start the engine they are sitting on. And no, I am not nice enough to turn the beacon lights on.
How likely is it that the engine gains enough suction to suck them in without they noticing it in time (considering the fact they need to standup and run for their lives)?
How long does it take for the engine to spool up enough suck a person in?
safety turbofan
edited yesterday
ymb1
68.9k7219367
asked yesterday
Hugo WoesthuisHugo Woesthuis
1,010724
$endgroup$
add a comment |
$begingroup$
I recently found this (IMO funny) picture. All funny and all. But let's make this a real situation.
Let's suppose I see my crush and his BF doing this, and I come with this 'genius' idea (alright, it's anything but a genius idea, but still) to start the engine they are sitting on. And no, I am not nice enough to turn the beacon lights on.
How likely is it that the engine gains enough suction to suck them in without they noticing it in time (considering the fact they need to standup and run for their lives)?
How long does it take for the engine to spool up enough suck a person in?
safety turbofan
edited yesterday
ymb1
68.9k7219367
asked yesterday
Hugo WoesthuisHugo Woesthuis
1,010724
$endgroup$
10
$begingroup$
I'm not sure why the VtC for "opinion based". Seems that there are some pretty reliable facts already posted in the answers.
$endgroup$
– FreeMan
yesterday
1
$begingroup$
Since they are both wearing ties, one would hope that'd get sucked into the core.
$endgroup$
– MikeY
yesterday
5
$begingroup$
Ironically, that looks like an A320, but the start panel is from a B737.
$endgroup$
– Bianfable
17 hours ago
3
$begingroup$
That picture's totally inappropriate for this site. Who starts engine 1 first!?
$endgroup$
– 0xdd
10 hours ago
add a comment |
$begingroup$
I recently found this (IMO funny) picture. All funny and all. But let's make this a real situation.
Let's suppose I see my crush and his BF doing this, and I come with this 'genius' idea (alright, it's anything but a genius idea, but still) to start the engine they are sitting on. And no, I am not nice enough to turn the beacon lights on.
How likely is it that the engine gains enough suction to suck them in without they noticing it in time (considering the fact they need to standup and run for their lives)?
How long does it take for the engine to spool up enough suck a person in?
safety turbofan
edited yesterday
ymb1
68.9k7219367
asked yesterday
Hugo WoesthuisHugo Woesthuis
1,010724
$endgroup$
I recently found this (IMO funny) picture. All funny and all. But let's make this a real situation.
Let's suppose I see my crush and his BF doing this, and I come with this 'genius' idea (alright, it's anything but a genius idea, but still) to start the engine they are sitting on. And no, I am not nice enough to turn the beacon lights on.
How likely is it that the engine gains enough suction to suck them in without they noticing it in time (considering the fact they need to standup and run for their lives)?
How long does it take for the engine to spool up enough suck a person in?
safety turbofan
safety turbofan
edited yesterday
ymb1
68.9k7219367
asked yesterday
Hugo WoesthuisHugo Woesthuis
1,010724
edited yesterday
ymb1
68.9k7219367
asked yesterday
Hugo WoesthuisHugo Woesthuis
1,010724
edited yesterday
ymb1
68.9k7219367
edited yesterday
ymb1
68.9k7219367
edited yesterday
ymb1
68.9k7219367
68.9k7219367
asked yesterday
Hugo WoesthuisHugo Woesthuis
1,010724
asked yesterday
Hugo WoesthuisHugo Woesthuis
1,010724
asked yesterday
Hugo WoesthuisHugo Woesthuis
1,010724
1,010724
10
$begingroup$
I'm not sure why the VtC for "opinion based". Seems that there are some pretty reliable facts already posted in the answers.
$endgroup$
– FreeMan
yesterday
1
$begingroup$
Since they are both wearing ties, one would hope that'd get sucked into the core.
$endgroup$
– MikeY
yesterday
5
$begingroup$
Ironically, that looks like an A320, but the start panel is from a B737.
$endgroup$
– Bianfable
17 hours ago
3
$begingroup$
That picture's totally inappropriate for this site. Who starts engine 1 first!?
$endgroup$
– 0xdd
10 hours ago
add a comment |
10
$begingroup$
I'm not sure why the VtC for "opinion based". Seems that there are some pretty reliable facts already posted in the answers.
$endgroup$
– FreeMan
yesterday
1
$begingroup$
Since they are both wearing ties, one would hope that'd get sucked into the core.
$endgroup$
– MikeY
yesterday
5
$begingroup$
Ironically, that looks like an A320, but the start panel is from a B737.
$endgroup$
– Bianfable
17 hours ago
3
$begingroup$
That picture's totally inappropriate for this site. Who starts engine 1 first!?
$endgroup$
– 0xdd
10 hours ago
10
10
$begingroup$
I'm not sure why the VtC for "opinion based". Seems that there are some pretty reliable facts already posted in the answers.
$endgroup$
– FreeMan
yesterday
$begingroup$
I'm not sure why the VtC for "opinion based". Seems that there are some pretty reliable facts already posted in the answers.
$endgroup$
– FreeMan
yesterday
1
1
$begingroup$
Since they are both wearing ties, one would hope that'd get sucked into the core.
$endgroup$
– MikeY
yesterday
$begingroup$
Since they are both wearing ties, one would hope that'd get sucked into the core.
$endgroup$
– MikeY
yesterday
5
5
$begingroup$
Ironically, that looks like an A320, but the start panel is from a B737.
$endgroup$
– Bianfable
17 hours ago
$begingroup$
Ironically, that looks like an A320, but the start panel is from a B737.
$endgroup$
– Bianfable
17 hours ago
3
3
$begingroup$
That picture's totally inappropriate for this site. Who starts engine 1 first!?
$endgroup$
– 0xdd
10 hours ago
$begingroup$
That picture's totally inappropriate for this site. Who starts engine 1 first!?
$endgroup$
– 0xdd
10 hours ago
add a comment |
3 Answers
3
active
oldest
votes
$begingroup$
(Airbus)
The suck zone ahead of a CFM56 on an A320 is less than 5 meters. The couple have enough time to take a leisurely walk toward the cockpit window.
The engine start time takes upwards of a minute (the starter is limited to four 2-minute bursts, followed by a 15 min cool down). Newer engines take longer to start.
On the neo with PW1000G engines it's 2.9 m. On the A380 it's, surprisingly, only 4.5 m.
How soon can they reunite after a shutdown? It won't be a long wait.
answered yesterday
ymb1ymb1
68.9k7219367
$endgroup$
9
$begingroup$
And, it gets really loud immediately when the starter engages. That'll get your attention right away, followed by the fan starting to turn slowly.
$endgroup$
– Ralph J
yesterday
$begingroup$
The suction power is massively overrated. If you had hard vacuum in a cylindre, you only need to go 1 diameter away to have negligible suction. But it ramps up nicely inwards from there.
$endgroup$
– Stian Yttervik
3 hours ago
add a comment |
$begingroup$
A start on a TF all the way to idle is about 20-40 seconds depending on the engine, and the fan itself won't do more than creep a bit until the core actually lights off which is 5-10 seconds, so they'll have lots of time to get down and get away as per @ymb1's diagram, once the wheeEEEEEEEEEEtickticktickticktickticktick starts.
answered yesterday
John KJohn K
23.4k13368
$endgroup$
18
$begingroup$
I love the written description of the startup sound. +1
$endgroup$
– Pugz
yesterday
$begingroup$
From now on this is the sound of evil.
$endgroup$
– Peter
yesterday
$begingroup$
@Peter It's music. Best of all is the sound of a Huey helicopter. youtube.com/watch?v=IA9knzev85I Listen carefully. There must be 4 or 5 ascending howls and groans and whines in a sequence as the, starter, engine and various gearboxes wind up in turn. It's a symphony.
$endgroup$
– John K
yesterday
$begingroup$
Hmm... How much suction is the core creating during that 20-40 seconds, though? N2 has to get relatively high before the core lights, doesn't it? Seems like that would still result in a pretty substantial mass flow (though obviously not as much as when the fan spins up.)
$endgroup$
– reirab
9 hours ago
add a comment |
$begingroup$
WHAT?? LET'S GET AWAY FROM THIS LOUD ENGINE
Before it can even start to turn the fan, the noises the engine must make will be so deafening as to force the people in that location to flee.
And even before that, there would be clunks, shakes, and vibration that would be very noticeable, and put even deaf people on notice to clear out.
There would be no mistaking the engine starting up.
answered yesterday
HarperHarper
4,209725
$endgroup$
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
(Airbus)
The suck zone ahead of a CFM56 on an A320 is less than 5 meters. The couple have enough time to take a leisurely walk toward the cockpit window.
The engine start time takes upwards of a minute (the starter is limited to four 2-minute bursts, followed by a 15 min cool down). Newer engines take longer to start.
On the neo with PW1000G engines it's 2.9 m. On the A380 it's, surprisingly, only 4.5 m.
How soon can they reunite after a shutdown? It won't be a long wait.
answered yesterday
ymb1ymb1
68.9k7219367
$endgroup$
9
$begingroup$
And, it gets really loud immediately when the starter engages. That'll get your attention right away, followed by the fan starting to turn slowly.
$endgroup$
– Ralph J
yesterday
$begingroup$
The suction power is massively overrated. If you had hard vacuum in a cylindre, you only need to go 1 diameter away to have negligible suction. But it ramps up nicely inwards from there.
$endgroup$
– Stian Yttervik
3 hours ago
add a comment |
$begingroup$
(Airbus)
The suck zone ahead of a CFM56 on an A320 is less than 5 meters. The couple have enough time to take a leisurely walk toward the cockpit window.
The engine start time takes upwards of a minute (the starter is limited to four 2-minute bursts, followed by a 15 min cool down). Newer engines take longer to start.
On the neo with PW1000G engines it's 2.9 m. On the A380 it's, surprisingly, only 4.5 m.
How soon can they reunite after a shutdown? It won't be a long wait.
answered yesterday
ymb1ymb1
68.9k7219367
$endgroup$
9
$begingroup$
And, it gets really loud immediately when the starter engages. That'll get your attention right away, followed by the fan starting to turn slowly.
$endgroup$
– Ralph J
yesterday
$begingroup$
The suction power is massively overrated. If you had hard vacuum in a cylindre, you only need to go 1 diameter away to have negligible suction. But it ramps up nicely inwards from there.
$endgroup$
– Stian Yttervik
3 hours ago
add a comment |
$begingroup$
(Airbus)
The suck zone ahead of a CFM56 on an A320 is less than 5 meters. The couple have enough time to take a leisurely walk toward the cockpit window.
The engine start time takes upwards of a minute (the starter is limited to four 2-minute bursts, followed by a 15 min cool down). Newer engines take longer to start.
On the neo with PW1000G engines it's 2.9 m. On the A380 it's, surprisingly, only 4.5 m.
How soon can they reunite after a shutdown? It won't be a long wait.
answered yesterday
ymb1ymb1
68.9k7219367
$endgroup$
(Airbus)
The suck zone ahead of a CFM56 on an A320 is less than 5 meters. The couple have enough time to take a leisurely walk toward the cockpit window.
The engine start time takes upwards of a minute (the starter is limited to four 2-minute bursts, followed by a 15 min cool down). Newer engines take longer to start.
On the neo with PW1000G engines it's 2.9 m. On the A380 it's, surprisingly, only 4.5 m.
How soon can they reunite after a shutdown? It won't be a long wait.
answered yesterday
ymb1ymb1
68.9k7219367
edited yesterday
answered yesterday
ymb1ymb1
68.9k7219367
answered yesterday
ymb1ymb1
68.9k7219367
answered yesterday
ymb1ymb1
68.9k7219367
68.9k7219367
9
$begingroup$
And, it gets really loud immediately when the starter engages. That'll get your attention right away, followed by the fan starting to turn slowly.
$endgroup$
– Ralph J
yesterday
$begingroup$
The suction power is massively overrated. If you had hard vacuum in a cylindre, you only need to go 1 diameter away to have negligible suction. But it ramps up nicely inwards from there.
$endgroup$
– Stian Yttervik
3 hours ago
add a comment |
9
$begingroup$
And, it gets really loud immediately when the starter engages. That'll get your attention right away, followed by the fan starting to turn slowly.
$endgroup$
– Ralph J
yesterday
$begingroup$
The suction power is massively overrated. If you had hard vacuum in a cylindre, you only need to go 1 diameter away to have negligible suction. But it ramps up nicely inwards from there.
$endgroup$
– Stian Yttervik
3 hours ago
9
9
$begingroup$
And, it gets really loud immediately when the starter engages. That'll get your attention right away, followed by the fan starting to turn slowly.
$endgroup$
– Ralph J
yesterday
$begingroup$
And, it gets really loud immediately when the starter engages. That'll get your attention right away, followed by the fan starting to turn slowly.
$endgroup$
– Ralph J
yesterday
$begingroup$
The suction power is massively overrated. If you had hard vacuum in a cylindre, you only need to go 1 diameter away to have negligible suction. But it ramps up nicely inwards from there.
$endgroup$
– Stian Yttervik
3 hours ago
$begingroup$
The suction power is massively overrated. If you had hard vacuum in a cylindre, you only need to go 1 diameter away to have negligible suction. But it ramps up nicely inwards from there.
$endgroup$
– Stian Yttervik
3 hours ago
add a comment |
$begingroup$
A start on a TF all the way to idle is about 20-40 seconds depending on the engine, and the fan itself won't do more than creep a bit until the core actually lights off which is 5-10 seconds, so they'll have lots of time to get down and get away as per @ymb1's diagram, once the wheeEEEEEEEEEEtickticktickticktickticktick starts.
answered yesterday
John KJohn K
23.4k13368
$endgroup$
18
$begingroup$
I love the written description of the startup sound. +1
$endgroup$
– Pugz
yesterday
$begingroup$
From now on this is the sound of evil.
$endgroup$
– Peter
yesterday
$begingroup$
@Peter It's music. Best of all is the sound of a Huey helicopter. youtube.com/watch?v=IA9knzev85I Listen carefully. There must be 4 or 5 ascending howls and groans and whines in a sequence as the, starter, engine and various gearboxes wind up in turn. It's a symphony.
$endgroup$
– John K
yesterday
$begingroup$
Hmm... How much suction is the core creating during that 20-40 seconds, though? N2 has to get relatively high before the core lights, doesn't it? Seems like that would still result in a pretty substantial mass flow (though obviously not as much as when the fan spins up.)
$endgroup$
– reirab
9 hours ago
add a comment |
$begingroup$
A start on a TF all the way to idle is about 20-40 seconds depending on the engine, and the fan itself won't do more than creep a bit until the core actually lights off which is 5-10 seconds, so they'll have lots of time to get down and get away as per @ymb1's diagram, once the wheeEEEEEEEEEEtickticktickticktickticktick starts.
answered yesterday
John KJohn K
23.4k13368
$endgroup$
18
$begingroup$
I love the written description of the startup sound. +1
$endgroup$
– Pugz
yesterday
$begingroup$
From now on this is the sound of evil.
$endgroup$
– Peter
yesterday
$begingroup$
@Peter It's music. Best of all is the sound of a Huey helicopter. youtube.com/watch?v=IA9knzev85I Listen carefully. There must be 4 or 5 ascending howls and groans and whines in a sequence as the, starter, engine and various gearboxes wind up in turn. It's a symphony.
$endgroup$
– John K
yesterday
$begingroup$
Hmm... How much suction is the core creating during that 20-40 seconds, though? N2 has to get relatively high before the core lights, doesn't it? Seems like that would still result in a pretty substantial mass flow (though obviously not as much as when the fan spins up.)
$endgroup$
– reirab
9 hours ago
add a comment |
$begingroup$
A start on a TF all the way to idle is about 20-40 seconds depending on the engine, and the fan itself won't do more than creep a bit until the core actually lights off which is 5-10 seconds, so they'll have lots of time to get down and get away as per @ymb1's diagram, once the wheeEEEEEEEEEEtickticktickticktickticktick starts.
answered yesterday
John KJohn K
23.4k13368
$endgroup$
A start on a TF all the way to idle is about 20-40 seconds depending on the engine, and the fan itself won't do more than creep a bit until the core actually lights off which is 5-10 seconds, so they'll have lots of time to get down and get away as per @ymb1's diagram, once the wheeEEEEEEEEEEtickticktickticktickticktick starts.
answered yesterday
John KJohn K
23.4k13368
answered yesterday
John KJohn K
23.4k13368
answered yesterday
John KJohn K
23.4k13368
answered yesterday
John KJohn K
23.4k13368
23.4k13368
18
$begingroup$
I love the written description of the startup sound. +1
$endgroup$
– Pugz
yesterday
$begingroup$
From now on this is the sound of evil.
$endgroup$
– Peter
yesterday
$begingroup$
@Peter It's music. Best of all is the sound of a Huey helicopter. youtube.com/watch?v=IA9knzev85I Listen carefully. There must be 4 or 5 ascending howls and groans and whines in a sequence as the, starter, engine and various gearboxes wind up in turn. It's a symphony.
$endgroup$
– John K
yesterday
$begingroup$
Hmm... How much suction is the core creating during that 20-40 seconds, though? N2 has to get relatively high before the core lights, doesn't it? Seems like that would still result in a pretty substantial mass flow (though obviously not as much as when the fan spins up.)
$endgroup$
– reirab
9 hours ago
add a comment |
18
$begingroup$
I love the written description of the startup sound. +1
$endgroup$
– Pugz
yesterday
$begingroup$
From now on this is the sound of evil.
$endgroup$
– Peter
yesterday
$begingroup$
@Peter It's music. Best of all is the sound of a Huey helicopter. youtube.com/watch?v=IA9knzev85I Listen carefully. There must be 4 or 5 ascending howls and groans and whines in a sequence as the, starter, engine and various gearboxes wind up in turn. It's a symphony.
$endgroup$
– John K
yesterday
$begingroup$
Hmm... How much suction is the core creating during that 20-40 seconds, though? N2 has to get relatively high before the core lights, doesn't it? Seems like that would still result in a pretty substantial mass flow (though obviously not as much as when the fan spins up.)
$endgroup$
– reirab
9 hours ago
18
18
$begingroup$
I love the written description of the startup sound. +1
$endgroup$
– Pugz
yesterday
$begingroup$
I love the written description of the startup sound. +1
$endgroup$
– Pugz
yesterday
$begingroup$
From now on this is the sound of evil.
$endgroup$
– Peter
yesterday
$begingroup$
From now on this is the sound of evil.
$endgroup$
– Peter
yesterday
$begingroup$
@Peter It's music. Best of all is the sound of a Huey helicopter. youtube.com/watch?v=IA9knzev85I Listen carefully. There must be 4 or 5 ascending howls and groans and whines in a sequence as the, starter, engine and various gearboxes wind up in turn. It's a symphony.
$endgroup$
– John K
yesterday
$begingroup$
@Peter It's music. Best of all is the sound of a Huey helicopter. youtube.com/watch?v=IA9knzev85I Listen carefully. There must be 4 or 5 ascending howls and groans and whines in a sequence as the, starter, engine and various gearboxes wind up in turn. It's a symphony.
$endgroup$
– John K
yesterday
$begingroup$
Hmm... How much suction is the core creating during that 20-40 seconds, though? N2 has to get relatively high before the core lights, doesn't it? Seems like that would still result in a pretty substantial mass flow (though obviously not as much as when the fan spins up.)
$endgroup$
– reirab
9 hours ago
$begingroup$
Hmm... How much suction is the core creating during that 20-40 seconds, though? N2 has to get relatively high before the core lights, doesn't it? Seems like that would still result in a pretty substantial mass flow (though obviously not as much as when the fan spins up.)
$endgroup$
– reirab
9 hours ago
add a comment |
$begingroup$
WHAT?? LET'S GET AWAY FROM THIS LOUD ENGINE
Before it can even start to turn the fan, the noises the engine must make will be so deafening as to force the people in that location to flee.
And even before that, there would be clunks, shakes, and vibration that would be very noticeable, and put even deaf people on notice to clear out.
There would be no mistaking the engine starting up.
answered yesterday
HarperHarper
4,209725
$endgroup$
add a comment |
$begingroup$
WHAT?? LET'S GET AWAY FROM THIS LOUD ENGINE
Before it can even start to turn the fan, the noises the engine must make will be so deafening as to force the people in that location to flee.
And even before that, there would be clunks, shakes, and vibration that would be very noticeable, and put even deaf people on notice to clear out.
There would be no mistaking the engine starting up.
answered yesterday
HarperHarper
4,209725
$endgroup$
add a comment |
$begingroup$
WHAT?? LET'S GET AWAY FROM THIS LOUD ENGINE
Before it can even start to turn the fan, the noises the engine must make will be so deafening as to force the people in that location to flee.
And even before that, there would be clunks, shakes, and vibration that would be very noticeable, and put even deaf people on notice to clear out.
There would be no mistaking the engine starting up.
answered yesterday
HarperHarper
4,209725
$endgroup$
WHAT?? LET'S GET AWAY FROM THIS LOUD ENGINE
Before it can even start to turn the fan, the noises the engine must make will be so deafening as to force the people in that location to flee.
And even before that, there would be clunks, shakes, and vibration that would be very noticeable, and put even deaf people on notice to clear out.
There would be no mistaking the engine starting up.
answered yesterday
HarperHarper
4,209725
edited 3 hours ago
answered yesterday
HarperHarper
4,209725
answered yesterday
HarperHarper
4,209725
answered yesterday
HarperHarper
4,209725
4,209725
add a comment |
add a comment |
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10
$begingroup$
I'm not sure why the VtC for "opinion based". Seems that there are some pretty reliable facts already posted in the answers.
$endgroup$
– FreeMan
yesterday
1
$begingroup$
Since they are both wearing ties, one would hope that'd get sucked into the core.
$endgroup$
– MikeY
yesterday
5
$begingroup$
Ironically, that looks like an A320, but the start panel is from a B737.
$endgroup$
– Bianfable
17 hours ago
3
$begingroup$
That picture's totally inappropriate for this site. Who starts engine 1 first!?
$endgroup$
– 0xdd
10 hours ago