Airship-to-Orbit?

Richard Lamb wrote:

Funny.
I thought frequency was the inverse of wavelength.
x time 1/x = 1 ???

Perhaps you are thinking of a vibrating string as in a guitar where the
frequency is determined by the tension and mass per unit length and wavelengths
have to be integer multiples of the length of the string.

The speed is fixed by the speed of a displacement wave in the string and can be
ignored.

When you use half the string you get twice the frequency.

-- Charlie Springer

From: Richard Riley
Date: 5/27/2004 10:21 PM Central Daylight Time
Message-id:

On 28 May 2004 03:11:03 GMT, (Regnirps) wrote:

(Wright1902Glider) wrote:
:
:Um,
:
:What happens to the gas bag once it makes orbit? Am I correct in assuming
:that
:there will be a serious pressure differential between the interior and
:exterior
:of the bag? I'm thinking "World's Largest Baloon Goes POP!" ?????
:
:Ask yourself, what is the difference between almost a vacuum and a vacuum?
Not
:much. If it will hold 16 lbs/sq in, that is about all you need. Things like
eople only blow up in vacuum in fiction. If they did, then immagine what
would
:happen to a SCUBA diver as they come up through three atmospheres of
pressure
:change!

If it's filled with pure O2, 3 or 4 psi will do it, that's what Apollo
used.

Not that I believe the rest of it, mind you.
The low pressure in the Apollo spacecraft had more to do with the space suits
than structural integrity of the spacecraft. Space suits lose flexibility as
inside to outside presure ratio increases. They kept the pressure in the
spacecraft low to avoid having to slowly decompress before landing on the moon.
I believe the shuttle does it for the same reason.

An amusing aside: when White did his space walk from a Gemini his suit swelled
to the point he couldn't get back in until they bled off pressure.

Dan, U.S. Air Force, retired

(B2431) wrote:

The low pressure in the Apollo spacecraft had more to do with the space suits
than structural integrity of the spacecraft. Space suits lose flexibility as
inside to outside presure ratio increases. They kept the pressure in the
spacecraft low to avoid having to slowly decompress before landing on the
moon.
I believe the shuttle does it for the same reason.


I believe it, but the partial pressure of oxygen in the atmosphere at sea level
is about 3.5 lbs/sq in. , so you don't need any more than that. In fact unless
there are other low pressure problems like osmotic gradients in the lungs or
something, you should be able to run fine at one or two pounds of straight O2.

-- Charlie Springer

"Morgans" wrote in message
...

"Ron Wanttaja" wrote

Back when I was just a young engineer, the test organization I
was in did
leak testing for the fuel tanks for the first Air-Launched Cruise
Missiles
(ALCMs). Said tanks were pressurized with helium, with a sniffer
to chase
down the leaks.

Ron Wanttaja

So how did it let you know it found a leak? Did it start talking
to you in
a real high, squeaky voice? g

Naaaa Jim, the little buzzer thingy went very high pitched.:-)
--
---
Cheers,
Jonathan Lowe.
/
don't bother me with insignificiant nonsence such as spelling,
I don't care if it spelt properly
/
Sometimes I fly and sometimes I just dream about it.
:-)

--
Jim in NC


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