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How long to clear the 'suck zone' of a turbofan after start is initiated?

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14

1

$begingroup$

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

share|improve this question

edited 9 hours ago

ymb1

68.8k7218366

asked 11 hours ago

Hugo WoesthuisHugo Woesthuis

965624

$endgroup$

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  $begingroup$
  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
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Since they are both wearing ties, one would hope that'd get sucked into the core.
  $endgroup$
  – MikeY
  6 hours ago
  

  
  
  
  

add a comment | 

14

1

$begingroup$

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

share|improve this question

edited 9 hours ago

ymb1

68.8k7218366

asked 11 hours ago

Hugo WoesthuisHugo Woesthuis

965624

$endgroup$

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  $begingroup$
  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
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Since they are both wearing ties, one would hope that'd get sucked into the core.
  $endgroup$
  – MikeY
  6 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

share|improve this question

edited 9 hours ago

ymb1

68.8k7218366

asked 11 hours ago

Hugo WoesthuisHugo Woesthuis

965624

$endgroup$

share|improve this question

edited 9 hours ago

ymb1

68.8k7218366

asked 11 hours ago

Hugo WoesthuisHugo Woesthuis

965624

share|improve this question

edited 9 hours ago

ymb1

68.8k7218366

asked 11 hours ago

Hugo WoesthuisHugo Woesthuis

965624

edited 9 hours ago

ymb1

68.8k7218366

edited 9 hours ago

ymb1

68.8k7218366

asked 11 hours ago

Hugo WoesthuisHugo Woesthuis

965624

asked 11 hours ago

Hugo WoesthuisHugo Woesthuis

965624

3 Answers
3

active

oldest

votes

16

$begingroup$

(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.

share|improve this answer

edited 6 hours ago

answered 10 hours ago

ymb1ymb1

68.8k7218366

$endgroup$

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  $begingroup$
  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
  10 hours ago
  

  
  
  
  

add a comment | 

15

$begingroup$

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.

share|improve this answer

answered 10 hours ago

John KJohn K

23.2k13268

$endgroup$

• 
  
  
  

  
  6
  

  
  
  
  
  
  

  
  $begingroup$
  I love the written description of the startup sound. +1
  $endgroup$
  – Pugz
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  From now on this is the sound of evil.
  $endgroup$
  – Peter
  7 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @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
  5 hours ago
  
  

  
  
  
  

add a comment | 

9

$begingroup$

WHAT?? I CAN'T HEAR YOU

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.

share|improve this answer

answered 7 hours ago

HarperHarper

4,149724

$endgroup$

add a comment | 

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16

$begingroup$

(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.

share|improve this answer

edited 6 hours ago

answered 10 hours ago

ymb1ymb1

68.8k7218366

$endgroup$

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  $begingroup$
  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
  10 hours ago
  

  
  
  
  

add a comment | 

16

$begingroup$

(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.

share|improve this answer

edited 6 hours ago

answered 10 hours ago

ymb1ymb1

68.8k7218366

$endgroup$

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  $begingroup$
  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
  10 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.

share|improve this answer

edited 6 hours ago

answered 10 hours ago

ymb1ymb1

68.8k7218366

$endgroup$

share|improve this answer

edited 6 hours ago

answered 10 hours ago

ymb1ymb1

68.8k7218366

answered 10 hours ago

ymb1ymb1

68.8k7218366

answered 10 hours ago

ymb1ymb1

68.8k7218366

15

$begingroup$

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.

share|improve this answer

answered 10 hours ago

John KJohn K

23.2k13268

$endgroup$

• 
  
  
  

  
  6
  

  
  
  
  
  
  

  
  $begingroup$
  I love the written description of the startup sound. +1
  $endgroup$
  – Pugz
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  From now on this is the sound of evil.
  $endgroup$
  – Peter
  7 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @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
  5 hours ago
  
  

  
  
  
  

add a comment | 

15

$begingroup$

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.

share|improve this answer

answered 10 hours ago

John KJohn K

23.2k13268

$endgroup$

• 
  
  
  

  
  6
  

  
  
  
  
  
  

  
  $begingroup$
  I love the written description of the startup sound. +1
  $endgroup$
  – Pugz
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  From now on this is the sound of evil.
  $endgroup$
  – Peter
  7 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @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
  5 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.

share|improve this answer

answered 10 hours ago

John KJohn K

23.2k13268

$endgroup$

share|improve this answer

answered 10 hours ago

John KJohn K

23.2k13268

answered 10 hours ago

John KJohn K

23.2k13268

answered 10 hours ago

John KJohn K

23.2k13268

9

$begingroup$

WHAT?? I CAN'T HEAR YOU

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.

share|improve this answer

answered 7 hours ago

HarperHarper

4,149724

$endgroup$

add a comment | 

9

$begingroup$

WHAT?? I CAN'T HEAR YOU

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.

share|improve this answer

answered 7 hours ago

HarperHarper

4,149724

$endgroup$

add a comment | 

$begingroup$

WHAT?? I CAN'T HEAR YOU

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.

share|improve this answer

answered 7 hours ago

HarperHarper

4,149724

$endgroup$

share|improve this answer

answered 7 hours ago

HarperHarper

4,149724

answered 7 hours ago

HarperHarper

4,149724

answered 7 hours ago

HarperHarper

4,149724