The amount of lift available from the air displaced by the Hindenburg (using
the gas volume only as an approximation of displacement) would be roughtly
525,000 lbs at 60 degrees F.
The total pressure on the surface area of the balloon (I figured it as a
cylinder with the ends left off to approximate the oblate speroid shape) at sea
level would be a shade over 68.3 million pounds if you had a perfect vacuum
inside. 14 lbs/sq inch adds up fast!
All this having absolutely nothing to do with 3-1000 tubes or amplifers!
Al
AB2ZY
________________________________________
From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf Of
Sam Carpenter [sam@owenscommunication.com]
Sent: Wednesday, May 11, 2011 3:20 PM
To: 'mikea'; amps@contesting.com
Subject: Re: [Amps] 3-1000 Amplifiers
I don't think it takes as much as we might think sometimes to do awesome
destruction with either pressure or vacuum. I think a pressure cooker is
only at around 12 pounds if I remember correctly and look at the launch that
lid can produce. Sometimes a few stories and out the roof. I expect the
inverse on a not so leaky vessel could be pretty awful at a near full
pulldown. Shattering glass in small pieces blowing inward at the same time
air is coming in from all directions balancing things on a vacuum tube break
may not be giving us a good comparison to a more stout structure.
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of mikea
Sent: Wednesday, May 11, 2011 12:33 PM
To: amps@contesting.com
Subject: Re: [Amps] 3-1000 Amplifiers
On Wed, May 11, 2011 at 11:14:59AM -0400, Al Kozakiewicz wrote:
[a vacuum-filled Hindenburg]
> Absolutely. However, the weight of a structure that size that could
> withstand the forces of a vacuum would well exceed the forces of
> buoyancy!
Just so. I got to see a very large vacuum chamber that had collapsed:
the NASA Manned Spacecraft Center's space environment chamber, which was
something like 5 meters diameter and 8 or 10 meters long. I drove to work
one morning, and it had changed shape from a vertical cylinder to something
like a crushed Coke can. This chamber was _heavily_ braced on the outside,
instead of being designed for flight. Oooopsie!
It even glowed on the inside when it was working, as one end had Damn Big
Muckin' Arc Lamps to simulate solar flux; the other had big loops of tubing
to carry LN2 to simulate the 3K cosmic background temperature.
--
Mike Andrews, W5EGO
mikea@mikea.ath.cx
Tired old sysadmin
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