Re: How Rockets Differ From Jets

tomcat;
>The basalt 'fabric' is interesting. Nowhere on the site listed did I
>see a meltpoint figure, however. Rock is usually good to about 3000
>deg. F. One possibility might be to put a thin layer of nanotube
>fabric over a thicker layer of basalt fabric, because nanotubes can
>really take the heat.
That's a good point and perhaps a darn good usage of such extremely
spendy CNT, as providing an outer layer of extreme thermal resistance.
However, spray on ceramic micro-balloons might outperform the CNT
thermally as well as in being perhaps 0.1% the cost per effective
usage. Whatever goes on that final outside layer needs to be highly
serviceable, meaning reparable and/or replaceable.

I'd save the CNT as primarily for the most critical structural
attributes, used sparingly because of it's cost and certainly
complexities in binder/sealer applications, whereas the composites of
basalt can be configured to suit the job/task at hand are going to be
easily field reparable (in space if need be) and eventually somewhat
moon-rock cheap.

>JB-WELD is a 500 deg. F. cement. Not capable of thousands of deg. F.
>Check out graphite epoxy instead. Basalt fabric laminated with
>graphite epoxy might be capable of 3000 deg. F., a reasonable figure if
>coated with nanotubes which are, in turn, protected by Corelle ceramic.
STOP IT RIGHT NOW!
You keep insisting upon draging the entire Spaceplane shell along with
it's massive outer shield/armor up and down until it all burns up. I
suppose that you'd insist upon dragging the fairly massive
Radium(RA226)-->Radon(Rn222) reactor up and down as well. Good grief,
what a horrific wast of energy.

Think outside the box. Think about getting the seriously heavy stuff
into LEO and keeping it there. What goes up should (if at all possible)
stay up.

BTW; JB-WELD is just one of my suggestions that would work perfectly
fine and dandy as the composite binder for the all-essential physical
and radiation shield attributes, that which again need NOT go up and
down with each and every flight. A form fitting outer composite shell
of a relatively thick and if need be as massive as nearly 3 g/cm3
shouldn't have to go up more than once.

>Believe me, it really gets hot in hypersonic air travel, whether for
>orbit insertion or reentry. Hot, hot, hot! An emergency reentry at
>100,000 mph without enough fuel for reverse thrust -- which also cuts
>off the liquid hydrogen cooling system -- can result in temperatures of
>20,000+ deg. F.!
A really good Space plane's aerodynamic body (w/o wings) is going to
create a fairly uniform pressure wave and subsequent vacuum drag
coefficient that'll act somewhat like creating an extremely large
friction buffer zone. Lots of sizable stuff arrives onto the surface of
Earth without all that much thermal damage, the trick being to keep the
mass per/m3 down to a dull roar. Besides, the outer-most layer of
composite basalt would merely fuse back together and intentionally
sluff off. Your "20,000+ deg. F.!" seems a wee bit on the high side,
although obviously ceramic tiles and/or spray-on coatings of ceramics
having a sufficient amount of CNT fibers involved should do quite
nicely (perhaps a CNT fabric of ceramic beads, as beads having been
cross threaded onto those spendy CNT fibers could be interesting).

How many minutes each way do you plan upon being the the "hypersonic
air travel" hot, hot, hot! mode?

You can also use nearly frozen H2O2, which has a great deal more
volumetric density and thus more thermal transfer capability than LH2.
You could also sprey out an invisible cloud of Radon(Rn222) as per
creating an extremely terrific refrigerant, thus creating a sub-frozen
artificial atmospheric surround (just don't breath the stuff).
~

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.
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

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