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'[TECH] skydive at Mach 1.2'
2010\01\25@204435 by John Gardner

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> I would need a liquid pump in my suit to empty it.

How come? Falling off a stepladder'll probably kill you...  :)

Jack

2010\01\25@205758 by Carl Denk

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It's not the fall, it's the sudden stop. My first job out of college was
a field engineer on a large bridge, inspecting structural steel 180'
above the river. Took a week or 2 to get the first 30' off the ground,
after that, doesn't feel any higher, the fall will have the same
result.That was before OSHA (Occupational safety and health act (law)).
A couple of times riding the crane hook, the operator gave me the option
of waiting or several scary steps to a safe area.

John Gardner wrote:
>> I would need a liquid pump in my suit to empty it.
>>    
>
> How come? Falling off a stepladder'll probably kill you...  :)
>
> Jack
>  

2010\01\26@122526 by Vitaliy

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Carl Denk wrote:
> It's not the fall, it's the sudden stop. My first job out of college was
> a field engineer on a large bridge, inspecting structural steel 180'
> above the river. Took a week or 2 to get the first 30' off the ground,
> after that, doesn't feel any higher, the fall will have the same
> result.

I can relate. When I did the (one and only) tandem jump, there were no
butterflies in the stomach, no weakness in the knees. I felt far less scared
stepping onto the wing than I would stepping onto a ledge of a 2 story
building. The surface was so far below that it almost seemed fake.

Vitaliy

2010\01\27@053333 by Rich

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Takes some kind of guts...Gotta know that operator can do his stuff...
----- Original Message -----
From: "Carl Denk" <spam_OUTcdenkTakeThisOuTspamwindstream.net>
To: "Microcontroller discussion list - Public." <.....piclistKILLspamspam@spam@mit.edu>
Sent: Monday, January 25, 2010 8:57 PM
Subject: Re: [TECH] skydive at Mach 1.2


{Quote hidden}

> --

2010\01\27@100423 by Carl Denk

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When you are the operator of a crane that can lift 150 ton, or handle
200' of boom, you are good. Much experience and reliable person. But
with a small crane, I did have the operator (liked the booze) once take
me around and around for probably 20 minutes as I sat on the head ache
ball (the solid steel weight just above the hook used to pull the cable
down, when the hook was high and lots of cable weight on the other side
of that to sheave). Of course then I was young, and fearless. But even
today at 71, heights don't bother me, but, I make sure there is a wide
firm place to put the feet. :)

Rich wrote:
> Takes some kind of guts...Gotta know that operator can do his stuff...
> {Original Message removed}


'[TECH] skydive at Mach 1.2'
2010\02\09@062717 by Russell McMahon
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Dateline Dalan, bove Shnzhen, below Guanzho - this messge was found while
serching for something more prosaic :-).

People have died jumping from high altitude.
Terminal velocity is approximately proportional to inverse air density.
Energy rises as V^2.. Air density drop logarithmicaly, halving about every
4500 metres (from memory). Combine all tyhat and you can get extremely
energetic at high altitudes. Then, go into  spin. Not recommended. I'm told
that ams and legs have detached. Lose consciousness and you probaby die.
Maintaining stability is extxremely desirable.

FWIW teriminal velocity can be found close enough by rarranging:

Force = Falling mss x g = 0.5 x Rho x A x V^2 x k

So Vtermianl ~~~~= sqrt(2mg/*Rhjo.A.k)
A = frontal area and k is drag coefficinet - strt with 1 for a flat plate.

As Rho tends to zero V tends to nasty

Rho starts at 1.3 kg/m^3 at sea level and decreases as above.

        Russel;

2010\02\09@085445 by YES NOPE9

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Just like Rossolll to put a spin on this topic ........
gus


{Quote hidden}

2010\02\09@192215 by Vitaliy

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"spin", HA! :-D


----- Original Message -----
From: "YES NOPE9" <yesspamKILLspamnope9.com>
To: "Microcontroller discussion list - Public." <.....piclistKILLspamspam.....mit.edu>
Sent: Tuesday, February 09, 2010 06:54
Subject: Re: [TECH] skydive at Mach 1.2


{Quote hidden}

> --

2010\02\09@201450 by John Gardner

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AFAIK there have only been a handful of very high altitude
static jumps. Of the USAF attempts, all survived, some with
relatively minor injuries.

A high-speed high-altitude ejection from an aircraft is a different
animal, with inauspicious survival prospects ...

The speed & altitude record for a successful ejection appears to
be Mach 3.25, at 80,000 ft.  Ouch.

Per  http://en.wikipedia.org/wiki/Ejection_seat

Jack

2010\02\10@110405 by Marechiare

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>...Combine all tyhat and you can get extremely energetic
> at high altitudes. Then, go into  spin. Not recommended.
> I'm told that ams and legs have detached. Lose
> consciousness and you probaby die. Maintaining stability
> is extxremely desirable.

Sure, for stability is the sign of mastery.

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