IndAeMed_F: Re: GLOC Disposal
- From: SS Mishra <ssmhialt@xxxxxxxx>
- To: indaemed@xxxxxxxxxxxxx
- Date: Mon, 05 Apr 2004 21:53:57 +0530
Thru IndAeMed@xxxxxxxxxxxxx:
--------------------------------------------
ALOC : Almost loss of consciousness
Sudhanshu
----- Original Message -----
From: "USM Bish" <bish@xxxxxxxxxxx>
To: <indaemed@xxxxxxxxxxxxx>
Sent: Monday, April 05, 2004 9:35 PM
Subject: IndAeMed_F: Re: GLOC Disposal
> Thru IndAeMed@xxxxxxxxxxxxx:
> --------------------------------------------
> On Sun, Apr 04, 2004 at 09:48:44AM -0700, PK Tyagi, MD DNB wrote:
> >
> > Faintness in the air was very much there in WWI, Air races
> > between WWI & II and continued with the emergence of high
> > performance fighters in the 30s.
>
> It depends on how you define as "High performance" ... the 30s
> were before the Mosquito, Meschermitts and the Zero ! If on the
> basis of accn alone, the Sopwith Pup (1916) in theory, with a
> max speed of about 180 Kmph, with an airframe strength of about
> 8G could also produce GLOC. This could out-turn any aircraft of
> its time 2:1, and sustain a 5-6 G manouvre without the blink of
> an eyelid ! AND there were no anti-G garments then! Over 1700
> Sopwith Pups were built during WW-I ! The Sopwith Pup and
> Sopwith Camel took as many lives in training as in actual
> encounters with German Fokkers. How many were G-LOC ? God only
> knows ...
>
> > The ASFs (F-15, F-16 & Mirage 2000) took to the skies in late
> > 70s and there was a spurt in the incidence of GLOC. It's only
> > after anonymous survey by Pluta in early 80s that people
> > realised that GLOC was a terrible hazard which needed to be
> > combated and High G training courses were conceived.It's not
> > surprising that nobody talked of 'faintness in the air' / GLOC
> > to you during your primary course.
>
> It is not exactly that. Prior to mid-80s, two things varied:
>
> a) The term "G-LOC", per se, did not exist.
>
> b) The explanation was different. Accn induced LOC was always
> thought to go through the phases of PLL -> CLL -> LOC ...
> Only that the gap between PLL to LOC was short.That was the
> explanation known to us of what we came to know in the 80s
> as G-LOC, and explanation was modified.
>
> c) The currently accepted explanation for G-LOC was therefore
> not there.Not that there were no incidences of acceleration
> induced LOC ...
>
> > It probably was not so well known at that time. I did my MD in
> > the 1990s and similarly no body talked of ALOC to me. Now I
> > have seen quite a few cases of ALOC in the centrifuge myself.
> > But although, it's still a relatively unknown entity, I do
> > teach it to my students.
>
> Oops ! I seem to be terribly out of sync ... What is ALOC ?
>
> Inquisitively yours,
>
> Bish
>
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