How many G's can a pilot endure?

Discussion in 'OFF-Topic / Misc.' started by freebird, Jan 22, 2009.

  1. freebird

    freebird Active Member

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    I have a question for you pilots out there, who may have had a turn in an accelerator.


    I was talking with a friend the other day about spaceflight the effects of long term G's on passengers.


    How long is the initial burn on the shuttle, and how many G's is it?

    Can a pilot/astronaut take 2 G's for a couple of hours in an acceleration couch?

    What about 3 G's? Could you take that for 2 hours?
     
  2. Maestro

    Maestro Active Member

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    I think you can only take Gs for a short period of time.

    I saw on a show that Harrier pilots had to take up to 5 Gs before passing out in order to be allowed to follow the fighter pilot training.

    If you failed that test, you had to go with the helicopter pilot training... Or choose an other career.

    A lot of things will influence your result... Your physical shape (is your heart strong enough to pump blood to your brain long enough ?), the distance between your head and your heart (a shorter distance = easier for the heart to pump blood there) and a few other things...
     
  3. freebird

    freebird Active Member

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    Thanks Maestro.

    How long did they have to withstand 5 G's? Probably only a few minutes?
     
  4. HoHun

    HoHun Active Member

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    Hi Freebird,

    >How long did they have to withstand 5 G's? Probably only a few minutes?

    I believe G tests in centrifuges are usually limited to times measured in seconds rather than in minutes.

    Here is a good discussion of transient Gs ... I haven't checked how well it relates to long-term Gs:

    "Of + and - G's" part two - alt.games.warbirds

    Regards,

    Henning (HoHun)
     
  5. Maestro

    Maestro Active Member

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    Hmmm... I don't know. But it certainly wasn't calculated in minutes. Here is a G-Test video made at 9 Gs... For F-16 pilots.


    View: https://www.youtube.com/watch?v=3rQexWEwV6M
     
  6. freebird

    freebird Active Member

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    9 G's is pretty high, even 6 G's is pretty extreme. I was looking at less G's {like 2.5} so if they were in a suit and reclined it might be possible to take it for extended periods {a couple hours for a primary burn}, the effective G's might only be 1.25 or 1.5 with a good suit seat

    From HoHuns link

     
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