Re: How Rockets Differ From Jets

tomcat (aka "How Rockets Differ From Jets"),
One minute worth of had aerobreaking doesn't seem all that
insurmountable, as I was thinking of your CNT covered basalt composite
Spaceplane taking 10 minutes for this transition.

>Disposable parachute is a bit extreme and does not take into account
>the enormous G forces generated by slowing down . . . instantly. It
>will take a shovel to remove the astronauts.
I like the part about using a "shovel to remove the astronauts".
However, I wasn't exactly thinking about deploying a 10,000 m2 worth of
aerobreaking ceramic parachute, more like a 100 m2 for a given 300
tonne Spaceplane that should get the astronaut removal tool down to
using a fork and spoon rather than a shovel. The parachute need not be
parachute shaped, rather more or less a sphere or that of a reverse
teardrop form of a ceramic aerobreaking drag inducing anchor.

>The cooling from the hydrogen fuel is essential for both the hull and
>interior. Unless, of course, you like a 1000 deg. F. cockpit with only
>your nomex flight suit between you and . . . cremation. That is what I
>meant when I said: hot, hot, hot.
Even 10 minutes worth of being within the externally "hot, hot, hot"
mode isn't going to get the interior of your CNT and Corelle coated
Spaceplane at more than a dry 50 deg. F rise (it's called
thermaldynamics of energy-in = energy-out), meaning it takes time for
thermal energy to transfer. Of course the greater the mass that's
situated between whatever's hot and what's not is working in your
favor. If systems and the crew and passengers can't take that sort of a
dry-heat licking and keep on ticking, then what's the point?

There's no such thing as achieving a zero thermal rise within the
Spaceplane interior. Thus why are you insisting upon achieving that
goal via the brute force and extremely volumetric inefficient method of
using LH2?

BTW; what's the other point in using such a low density product such as
Hydrogen?
Even LH2 is wossy density and, it'll take up 75% of the Spaceplane
interior in order to safely store enough of it to do any good. Between
your LH2, LO2 plus accommodating a great deal of systems, you'll be
lucky to having 10% usable interior. Is less than 10% usable volume
your goal? How about if there's only 5% remaining for the crew,
apssengers and whatever other payload, is that still going to fly?

If that Spaceplane core structure was of the basalt composite, along
with a few outer layers of CNT and as then having the brute-force
firewall as being your primary thermal shield of that Corelle should do
just fine and dandy without extra cooling. Remember it there's
artificially induced cooling involved, the a great dela of differential
will have to be within spec of one part geets extremely hot while the
other connecting part(s) remain extremely cold.

A Radium(Ra226) reactor at extreme pressure is already providing a
viable resource of easily refrigerated Radon. Do you not appreciate the
terrific density and thermal dynamics of Radon phase change and thus
thermal transfer that Rn222 can provide?

An accumulator/reactor cell of such highly pressurised radon is going
to be capable of supplying more viable heat transfer than even your
imagination can imagine. Then whatever's pre-heated Radon gets utilized
within fairly powerful ION thrusters. What's not to like?

>This would help a lot returning from Venus at 200,000 mph because of a
>good slingshot, finding out you had a hydrogen leak, and enable you to
>stop quick in the atmosphere so you don't have to listen to your face
>bubble and fry like bacon in hot grease.
Why "slingshot"?
If going to Venus is to orbit and get into rigid-airship mode of
efficiently cruising just below the cloud deck for months on end (say
35~45 km off the deck), thus being somewhat rather coolish (less than
400 K) and nicely protected from solar and cosmic radiation to boot.
Coming home would be a snap from within that thick soup of the day, or
rather best as from being within their nighttime season, whereas
aerodynamics of what your Spaceplane needs is that of an extremely cool
nighttime environment that's supposedly good for better than 1 mb at 85
km if not still flyable as great as 150 km off the deck, whereas from
that point on it's thrusters nearly all the way home. Because of the
solar gravity being generally opposed to letting your Spaceplane come
home via coasting (no slingshot of any moon either), I believe that's
where the continuous Radium-->Radon-->ion thrusting comes effectively
into play.

BTW; what hard-science and regular laws of physics has yourself and
certainly having most others convinced as to the Venus nighttime season
being insurmountably hot and nasty (key word being "insurmountably")?

Geothermal heat isn't everywhere, at least it's not everywhere as here
upon Earth, or as having been detected upon any other planet or moon.
So, why would the Venus season of nighttime be "insurmountably" hot,
much less "insurmountably" nasty?

I could help redesign your Spaceplane into being a multitasking
rigid-airship, or I could give the payload a viable rigid-airshelp that
could be quite easily deployed as you slingshot yourself about Venus in
order to head back towards mother Earth ASAP, that which if all goes
well could still be within 100e6 km of Venus by the time your high
velocity Spaceplane touches down upon your home tarmac. Of course, if
you're insisting upon waiting around untill the entire Spaceplane can
be affordably constructed out of CNT, in which case decades from now
you'll still be in R&D and bankrupt to boot, as either China, Russia or
perhaps even India/ESA are going to have established their one and only
LSE-CM/ISS, as well as having been there and done the Venus thing.
~

Life upon Venus, a township w/Bridge & ET/UFO Park-n-Ride Tarmac:
http://guthvenus.tripod.com/gv-town.htm
The Russian/China LSE-CM/ISS (Lunar Space Elevator)
http://guthvenus.tripod.com/lunar-space-elevator.htm
Venus ETs, plus the updated sub-topics; Brad Guth / GASA-IEIS
http://guthvenus.tripod.com/gv-topics.htm
Kurt Vonnegut would have to agree; War is War, thus "in war there are
no rules" - In fact, war has been the very reason of having to deal
with the likes of others that haven't been playing by whatever rules,
such as GW Bush.

.

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