Re: Airship to Orbit question
- From: dg@xxxxxxxxxxxxx (David Given)
- Date: Tue, 20 Dec 2005 15:06:58 GMT
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In article <1134957830.496632.113430@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
"beanstalkr" <navigaiter2002@xxxxxxx> writes:
> It's neither. It's not crazy and it's not possible with any balloon
> current flight profile. Vacuum is cheaper than helium. But most people
> don't realize the implosive force of one bar on a vacuum container. A
> bar is 14.7 pounds per square inch, multiplied by the hundreds of
> thousands of square inches on the surface of a large lifting tank.
It also doesn't help much --- hydrogen has about 1/18 the density of air at a
given pressure. Vacuum, of course, has 0/18 the density of air. So by using a
vacuum balloon, you end up making your life considerably more complex for only
an extra 6% boost in lifting capability.
- --
+- David Given --McQ-+
| dg@xxxxxxxxxxx | Quidquid latine dictum sit, altum viditur.
| (dg@xxxxxxxxxxxxx) |
+- www.cowlark.com --+
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