On Fri, 10 Jun 2005, Earl Colby Pottinger wrote:
Since I am located in Canada I can not supply you anyway...
I'm told that HTP, oddly enough, is *not* an export-controlled material.
That could change without warning, of course.
Henry
.
Henry Spencer
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. In Apollo 16's, a switch-setting
error disabled remote control and prevented it from being crashed after
separation.
Henry Spencer
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adaptive optics were used). The ray systems were,
of course, larger and might be more easily observed. But this is really
something you want to do from lunar orbit, if you want decent pictures.
Henry Spencer
.
Henry Spencer
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.
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/White's
Fundamentals of Astrodynamics. It's old and a lousy book, but it is
cheap. I mention it because people occasionally enthusiastically
recommend it, which I find bizarre.
Henry Spencer
.
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cross-section to avoid
heating problems during reentry.
Henry Spencer
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and harder to solve.
Henry Spencer
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.
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O2 and liquify it
on site with LN2...
This certainly doesn't cover LOX transport and use in general. There are
*lots* of industrial and medical LOX users.
Henry Spencer
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have a category for air-launched vehicles? My (dim and
possibly incorrect) memory is that the aviation records require that the
vehicle take off from the ground under its own power, and so the various
X-15 records are all unofficial.
Henry
unlikely to resurface.
Henry Spencer
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these things at the paramecium stage. :-)
Henry Spencer
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is an issue.
...do you need property to make a profit?
You can't sell something you don't own.
Henry Spencer
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for a Pfailure=1 safety analysis.
Henry Spencer
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this, I didn't save all of
the earlier mail -- could this be DCE-vs-DTE confusion? (That is, do you
need to add [or subtract] a null modem?)
Henry Spencer
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supersonic aircraft as air-launch
carrier vehicles.
Henry Spencer
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...)
Henry Spencer
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sp8100.pdf sp8126.pdf
which I *think* is everything NASA ever put online. (I might perhaps be
missing some on solid rockets, a topic I've never cared about.)
Henry Spencer
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the noise, at some cost in test complexity,
by injecting water into the edge of the jet as it emerges. Not as good as
not having the problem in the first place, but better than a big increase
in test turnaround time.
Henry Spencer
).
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) had no chance... until Byrd crashed on takeoff and was out of
the race.
Henry Spencer
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that they could use rotary seals rather
than flexible hoses.)
Henry Spencer
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of a combination of a
change of manufacturer and a desire to end some operational headaches
caused by troublesome design details of the old fluid-injection system.
Henry Spencer
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that the engines become quite significant
moving masses.
Henry Spencer
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with by vectoring. (Sometimes they have to be, e.g. in the
shuttle SRBs... but elaborate precautions are taken to match the SRBs as
closely as possible.)
Henry Spencer
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predictable startup behavior).
Depending on the configuration and the initial T/W ratio, it may require
fairly deep throttling (and a capacity to start deeply throttled) to make
this work.
Henry Spencer
you greater control, especially for
roll.
Roll control is generally a very minor issue, especially in a single-engine
vehicle that has no reason to have significant stray torques on that axis.
Henry Spencer
On Sun, 6 Jun 2004, John Carmack wrote:
A tip: color code your individual engines, both on your simulator, and on
the actual vehicle...
Checking first, of course, that nobody on your tech team is color-blind...
Henry Spencer
, but...)
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a disastrous design flaw for that application.
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of liquid surface per unit volume of
gas, a safe guess is that it'll be pretty close to the liquid temperature.
Henry Spencer
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legitimate -- in fact, most big liquid-fuel
rockets do that.
Henry Spencer
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kilogram injected.
Henry Spencer
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.
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.
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with little or
no added stiffening. (Witness the classical Atlas, whose tanks are just
sheet-metal balloons, with essentially no strength of their own.)
Henry Spencer
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it down! -- this could have been handled with feedforward
instead.
Henry Spencer
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.
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it can crank in the proper compensation as the engine shuts down,
rather than waiting to notice an attitude departure and then scrambling to
correct it.)
Henry Spencer
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to.
Henry Spencer
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for the horizontal/vertical transitions, although sneaky people did
discover some tricks that could be played by moving them while in
horizontal flight.)
Henry Spencer
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.
Henry Spencer
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. :-)
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stage of the Scout orbital launcher used coupled fins
and jet vanes.
Henry Spencer
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effective mostly
when they're near the level of the liquid surface, so you need them at
intervals all the way down the interior of the tank. This is less of an
issue if you can take advantage of them for structural strength...)
Henry Spencer
, including XCOR's future ones, they
won't have the time and energy to ask so many questions about each one. :-)
Henry Spencer
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that don't cooperate with the main one can
easily make things worse if not carefully analyzed. Especially if they
cut in and out suddenly rather than making gradual transitions.
Henry Spencer
bandwidth of the
eye-brain-hand system.
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on design and conditions. Also, that will generally be an
oscillating disturbance rather than a simple one-sided instability, so the
analogy remains weak.
Henry Spencer
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,
with no major maintenance.
True, engine walls that see extremely harsh conditions have limited lives,
deteriorating in various ways. The fix is to design your engines better.
Henry Spencer
.
Henry Spencer
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.
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On Mon, 12 Apr 2004, David Masten wrote:
What's happening? Space access isn't that big.
Reportedly there's some other big event in town, and it's sucking up all
the downtown hotel space for the first day or two.
Henry Spencer
momentarily. Being the cause/source
doesn't mean it's the whole story.
Henry Spencer
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in
LOX, but some (e.g. copper and some stainless steels) are quite resistant
to it.
Henry Spencer
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.
Henry Spencer
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. Almost all that
mass is fuel, which costs almost nothing.
And spending more to develop a more complex vehicle that will fly less
often is *not* a smart economic move.
Henry Spencer
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.
Henry Spencer
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in question...
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a difference in the preferred
approach.
Henry Spencer
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.
Uh, off? You mean out. And that is not a small assumption, given all
the nooks and crannies involved. (Although it may be possible to minimize
this problem if you specifically design for it.)
Henry Spencer
bays.
Designing a rocket stage to have a watertight outer surface around all
that inside hardware (while retaining easy access to it for maintenance)
would be a significant added design challenge.
Henry Spencer
trouble and considerable extra grief for the engineers, and the
only real gain is being able to boast about reusability.
Henry Spencer
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.
Henry Spencer
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.
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to confuse the homing
heads of heat-seeking missiles) as flashing lights... and that's not even
near IR, or at least there's not much near IR in it. (But the power output
is very high.)
Henry Spencer
.)
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at least some of it to a gas, and that seems to greatly
reduce the problems.
Henry Spencer
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. For a constant-pressure
spacecraft, I would think the only problem would be a bit of solvent
released into the air, which ought to be a relatively minor issue.
Henry Spencer
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use the space pens. Pens are better than pencils for this
application -- no graphite dust floating around, and no smudging.
Henry Spencer
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of Apollo 9 make the LM testing sound like a smooth
success, but in fact the guys in the back rooms had a lot of work to do
afterward, and there's a reason why Apollo 10 repeated some of the tests.
Henry Spencer
, I don't think it's quite that easy. :-(
Henry Spencer
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tough residues in
undesired places; TEB has relatively soft, untroublesome residues but
doesn't ignite quickly on contact with LOX; about 15% TEA in TEB is good.
Henry Spencer
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use as intermediates in
chemical processes. HMX didn't think the cost was a problem. Mind you,
there's a difference between what's cheap to a commercial contractor, even
a low-budget one, and what's cheap to a hobbyist group.
Henry Spencer
of Ring's slosh chapter badly,
let me know.)
Henry Spencer
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SP-8009, Propellant slosh loads, 1968. MIT AA.
Damping by wiping action on tank walls is weak.
Dynamic
.
Henry Spencer
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better next time, rather than
defending such a high-risk shortcut as if it were going to be standard
procedure.
Henry Spencer
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on the structures, and the situation is even
worse for lower-Isp combinations that need higher mass ratios.
Henry Spencer
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dangerous chemicals requiring elaborate
handling precautions.
Henry Spencer
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oxidizer is frequently cited as a big advantage of
air-breathing propulsion, with the implication that it should lower costs.
Henry Spencer
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?
Henry Spencer
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the details just right so it works well; such schemes are poorly explored
and there isn't a solid body of data to confidently base a design on.
Henry Spencer
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JBIS paper (in the
Nov/Dec 2001 and Jan/Feb 2002 issues) on the Almaz military space stations.
Henry Spencer
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a well-known type of device and
there are a number of similar machines in existence already. It's a
remarkable project for a high-school kid working on a shoestring, but it's
not a breakthrough in fusion technology.
Henry Spencer
On Mon, 15 Sep 2003, Aleta Jackson wrote:
As Henry Spencer so famously observed, the only good thing you can say
about it is it's not radioactive. ;-
And as Randall observed a bit later, you could fix that by making it with
tritium
.
Henry Spencer
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.
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don't aspire to anywhere near the level of reliability assurance
considered necessary for aircraft.
Henry Spencer
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of the incoming air is nitrogen, which serves
only as a coolant. Also, they typically don't use all the oxygen in the
air, because of the need to preserve their turbine blades.
Henry Spencer
.
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production run, buying used turbofans
is going to be a whole bunch cheaper.
Henry Spencer
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the concept NASA is so badly
broken that it cannot be fixed.
Henry Spencer
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http
.
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, even
simple ones, have complex behavior.
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volumes are basically
appendices: supporting documents, testimony transcripts, etc. etc. They
are bulky and aren't necessarily available in digital form; indeed, some
of them may be confidential and not for general distribution.
Henry Spencer
-- is always going to be a wee tad expensive.
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.
Which is not to say that the idea is ridiculous, but this does suggest
that detailed investigation and innovative design would be needed -- it's
not such a clear-cut win that just any old design would work well.
Henry Spencer
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