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












12












$begingroup$


Engine meme...or something



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











$endgroup$








  • 4




    $begingroup$
    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
    5 hours ago










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
















12












$begingroup$


Engine meme...or something



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











$endgroup$








  • 4




    $begingroup$
    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
    5 hours ago










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














12












12








12


1



$begingroup$


Engine meme...or something



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











$endgroup$




Engine meme...or something



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






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 6 hours ago









ymb1

68.7k7217365




68.7k7217365










asked 7 hours ago









Hugo WoesthuisHugo Woesthuis

955623




955623








  • 4




    $begingroup$
    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
    5 hours ago










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














  • 4




    $begingroup$
    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
    5 hours ago










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








4




4




$begingroup$
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
5 hours ago




$begingroup$
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
5 hours ago












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




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










3 Answers
3






active

oldest

votes


















14












$begingroup$

enter image description here

(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











$endgroup$









  • 4




    $begingroup$
    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
    6 hours ago



















13












$begingroup$

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









$endgroup$









  • 5




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










  • $begingroup$
    From now on this is the sound of evil.
    $endgroup$
    – Peter
    4 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
    1 hour ago





















8












$begingroup$

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









$endgroup$













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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    14












    $begingroup$

    enter image description here

    (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











    $endgroup$









    • 4




      $begingroup$
      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
      6 hours ago
















    14












    $begingroup$

    enter image description here

    (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











    $endgroup$









    • 4




      $begingroup$
      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
      6 hours ago














    14












    14








    14





    $begingroup$

    enter image description here

    (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











    $endgroup$



    enter image description here

    (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














    share|improve this answer



    share|improve this answer








    edited 2 hours ago

























    answered 7 hours ago









    ymb1ymb1

    68.7k7217365




    68.7k7217365








    • 4




      $begingroup$
      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
      6 hours ago














    • 4




      $begingroup$
      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
      6 hours ago








    4




    4




    $begingroup$
    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
    6 hours ago




    $begingroup$
    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
    6 hours ago











    13












    $begingroup$

    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









    $endgroup$









    • 5




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










    • $begingroup$
      From now on this is the sound of evil.
      $endgroup$
      – Peter
      4 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
      1 hour ago


















    13












    $begingroup$

    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









    $endgroup$









    • 5




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










    • $begingroup$
      From now on this is the sound of evil.
      $endgroup$
      – Peter
      4 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
      1 hour ago
















    13












    13








    13





    $begingroup$

    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









    $endgroup$



    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.







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 6 hours ago









    John KJohn K

    23.2k13268




    23.2k13268








    • 5




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










    • $begingroup$
      From now on this is the sound of evil.
      $endgroup$
      – Peter
      4 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
      1 hour ago
















    • 5




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










    • $begingroup$
      From now on this is the sound of evil.
      $endgroup$
      – Peter
      4 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
      1 hour ago










    5




    5




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




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












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






    $begingroup$
    From now on this is the sound of evil.
    $endgroup$
    – Peter
    4 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
    1 hour 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
    1 hour ago













    8












    $begingroup$

    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









    $endgroup$


















      8












      $begingroup$

      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









      $endgroup$
















        8












        8








        8





        $begingroup$

        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









        $endgroup$



        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












        share|improve this answer



        share|improve this answer










        answered 3 hours ago









        HarperHarper

        4,139724




        4,139724






























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