HDTenEightyP/NetNews huggingface dataset:
From: creutz@cco.caltech.edu (Michael John Creutz)
Subject: what is the carbonate for?
Organization: California Institute of Technology, Pasadena
Distribution: wo
Date: Fri, 11 Sep 1992 01:29:32 GMT

A fulminating mixture consists of 3 parts KNO_3, 2 parts S,
and one part KCO_3.  Your heat this mixture through its 
melting point, and it explodes.  I've tried it with K replaced
with Na, and it still works.  What puzzles me is that the carbonate
seems to be needed.  Does anyone have a simple explanation as to why?
I always thought that carbonates put fires out.
Mike
From: samw@bucket.rain.com (Sam Warden)
Newsgroups: rec.pyrotechnics
Subject: Re: Silver acetylide
Date: 9 Sep 92 18:56:42 GMT
Article-I.D.: bucket.samw.716065002
Organization: Rick's Home-Grown Un*x

So far as I know, coin silver is approx. 90% Ag and 10% Cu.  Of
course one would expect various trace impurities in any `technical'
alloy.  A standard technique for preparing reasonably pure AgNO3
from coin silver is to dissolve in HNO3, evaporate and roast the
product above the decomposition temperature of Cu(NO3)2 etc.
It's not terribly high, reachable in an evaporating dish over a Bunsen
burner as I recall.  AgNO3 is washed away from the CuO residue and
crystallized.  Watch out for NOx fumes from the roasting.

-- 
 
samw@bucket.rain.com (Sam Warden) -- and not a mere Device.
 
Newsgroups: rec.skydiving
From: tjreynol@zephyr.cair.du.edu (The Jumpin Dude)
Subject: Re: RW competitors
Organization: University of Denver
Date: Fri, 11 Sep 92 01:51:54 GMT

In article <27759@life.ai.mit.edu> bleck@ai.mit.edu writes:
>
>They had ground to air video there, so that's all I can talk about.

does everyone agree that air to air will be a huge improvement?

>Basically, they have a couple of nice $40,000 cameras there with huge

who buys these??

[rules, etc.]

are RW comp jumps always sequenced in advance by the judgiung commitee?
seems it would be more fair if everyone does the sme jump. or, are there
certain required formations, and lots of room to do whatever you want?


>Now, on to techniques...
>
>1) So.... what do you do about erroneous grip switches?  Before the
>competition in fact, one of the judges explained a bunch of things to us in a
>conversation Greg and I had with him.  Particularly, with video, whenever you
>do a transition it is suggested that you do a "Hi Sheri", ("Hi"--cross your
>arms in front of you, "Sheri"--uncross them), to wave to Sheri Scrimsher (sp?
>sorry...), former chierf USPA judge.  This signals the judges that you
>released your grips completely, even if there is this overlap on the video.

i see people dirt dive with their hands together during transitions, and
always thought it was just to keep out of each others way. maybe this is 
just good technique anyway for tight sequential?

>3) Get creepers!  The air force contingent brought their nice blue velour
>(sp?) creepers paid for with yours and my tax dollars, 

yea, those are pretty nice creepers. it'd be nice if the zoomies would
always bring those up with them ;-)  you know, the AF guys don't seem 
to get much media. are they anywhere near as good as the Knights?
over last weekend i heard they used two Twin Otters down in Colo Springs.
i think the federally funded airport I jump at oughta have an Otter :-)

>Oh, to give you an idea of what you need to do to be really good, the guys
>from Deland Gang (Craig Buxton, Mark Hewitt, et al.) do 8 jumps a day before
>2 o'clock--they have three rigs each, a packer, and video man, and they have
>a TV in the plane for debrief.  So, they jump, land, grab new rigs, get in
>the plane, de/rebrief, exit, land...  5 days a week.  What a job for the
>packer, to pack 40 rigs before I usually make it to a DZ...

AAARRGH! *HOW* do they AFFORD THAT?? the packer must make a KILLING!

>-Olaf

tim
whimpering about not having gazillions of dollars and a home in NE Tampa
or at least a turbine jump plane :-(
and a Lightning ;-)
hehehe i love it when Emacs matches up my smileys (:-)

Newsgroups: rec.skydiving
From: mandel@jumprun (Hector Mandel)
Subject: Re: St. Louis Arch Base Jump
X-Newsreader: Tin 1.1 PL4
Organization: University of Illinois at Urbana
Date: Wed, 16 Sep 1992 03:57:15 GMT

tjreynol@zephyr.cair.du.edu (The Jumpin Dude) writes:
: this morning, as i was avoiding waking up, i had the radio on, 
: and i think i remember hearing about a guy climbing the arch with 
: *suction cups* and 'parachuting off'. his buddies on the ground
: were arrested, if i recall correctly.
: 
: anyone know what happpened to him?
: 
: tim
: 

I heard something on the radio this a.m. too.  I didn't hear any details though
Can somebody post the story?  It sounded like it was a very successful jump.
I'm not sure about the suction cups though; is The Arch smooth enough that
suction cups would help?  :)

Newsgroups: rec.skydiving
From: battlec@cs.rpi.edu (Clark Battle)
Subject: Hang gliding
Date: Fri, 11 Sep 1992 19:08:03 GMT

Does anyone have a list of hang gliging sites in the Albany, NY area
or know where I can get this information? Mail me.

				ThanQ
From: SKYDIVE@f15.n233.z1.fidonet.org (SKYDIVE)
Newsgroups: rec.skydiving
Subject: Richmond, Indiana
Date: 4 Sep 92 14:12:11 GMT

Reply-to: Chris.Irwin@p0.f68.n110.z1.fidonet.org (Chris Irwin)
Fido-To: all

Just a note to invite everyone to the first annual "Richmond Turf-Surfing contest."  Two catagories will be introduced: Accuracy/Distance and Freestyle.  The contest will be held sometime during the labor-day event.  I hope to see some of you there.
 
For those of you that can't make it, I'll post the results and "dirt" here on Tuesday...
 
Chris Irwin

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--- eecp 1.45 LM2 

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From: SKYDIVE@f15.n233.z1.fidonet.org (SKYDIVE)
Newsgroups: rec.skydiving
Subject: Re: Airspeed vs Groundspeed
Date: 13 Sep 92 00:51:30 GMT

Reply-to: Bill.Caefer@p0.f853.n102.z1.fidonet.org (Bill Caefer)
Fido-To: romulus!@uxc.cso.uiuc.edu:wain@deco

 r> I agree the airspeed is always the same, however you do not want to
 r> try to inflate end cells by flying
 r> crosswind this will keep pressure on the sides of the end
 r> cells and inhibit the inflation.  Remember during turblence it is best
 r> to keep as straight to the wind as possible to keep end cells from
 r> closing.

The only word for that is: Nonsense.  A canopy can not and does not ever feel anything but forward wind.  Think about it.


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--- eecp 1.45 LM2 

 * Origin: <X> Infinity Ltd.  HST/DS (1:102/853)
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From: bleck@aztec.ai.mit.edu (Olaf Bleck)
Newsgroups: rec.skydiving
Subject: Re: Airspeed vs Groundspeed
Date: 9 Sep 92 23:30:18 GMT
Reply-To: bleck@ai.mit.edu
Organization: MIT Artificial Intelligence Laboratory

In article <1992Sep9.175624.1758@porthos.cc.bellcore.com>, wain@decoy.uucp (25498-greenhalgh) writes:
|> In article <1992Sep9.113040.9895@uoft02.utoledo.edu> dsouth@uoft02.utoledo.edu (Dale Southard Jr.) writes:
|> >
|> >All this talk of ground speed and airspeed brings up a point I was
|> >discussing with an intermediate jumper this weekend.
|> >
|> >Canopy AIRSPEED is the same wether you are facing in an upwind, downwind
|> >or crosswind direction.  The only thing that changes is the GROUNDSPEED.


|> I agree the airspeed is always the same, however you do not want to
|> try to inflate end cells by flying
|> crosswind this will kep pressure on the sides of the end
|> cells and inhibit the inflation.  Remember during turblence it is best
|> to keep as straight to the wind as possible to keep end cells from
|> closing.


The airspeed is the roughly the same in every direction once you've started
moving completely with the air current, which never really happens, but you
come close a while after your canopy is fully inflated.  Otherwise, it
changes depending on your orientatation, because of your own inertia.  

Figure that essentially your inertial reference is to gravity/earth/etc., but
your airspeed reference is to the air current.  Of course, if you had no
mass...  well, it would change a lot of things, not just airspeed!

-Olaf
From: tcashin@zeus.ladc.bull.com
Newsgroups: rec.skydiving
Subject: Re: U.S. Nationals; what's happenning?
Date: 15 Sep 92 20:57:25 GMT
Reply-To: Tim_Cashin@l66a.ladc.bull.com
Organization: Bull HN Information Systems Inc. Los Angeles Development Center

In article <1992Sep15.040405.7027@ptcburp.ptcbu.oz.au>,
fbm@ptcburp.ptcbu.oz.au (Farrell McKay) writes:
|>My sources lead me to believe that the U.S. Nationals
|>Competition finished last weekend.  Is this right?

   Nope. They will be held at the end of October. I don't have the dates here.

|>
|>If so, would some kind soul please post the
|>scores/results/teams info for all of us to mull over.
|>

   I'm sure someone will.

|>Blue skies,
|>Farrell.
|>--
|>      -m-------  Farrell McKay,                   fbm@ptcburp.ptcbu.oz.au
|>    ---mmm-----  Pyramid Technology Aust.,        ...!munnari!ptcburp.oz!fbm
|>  -----mmmmm---  Research Park, Bond University,  +61 75 950256
|>-------mmmmmmm-  Gold Coast, Qld 4229, AUSTRALIA  +61 75 722475 FAX

Tim
Tim_Cashin@l66a.ladc.bull.com             
Newsgroups: rec.skydiving
From: eap@leland.Stanford.EDU (Eric Perozziello)
Subject: Re: Looking for pictures of formations
Organization: DSG, Stanford University, CA 94305, USA
Date: Wed, 16 Sep 92 00:05:54 GMT

>> Hey, I don't see a smiley here !!!  Somebody, PLEASE say this is a joke!
>> 
>> Just go have fun, damnit!
>
>Well Eric, skydiving is fun.  That's why I do it, too.  But I believe
>most of the skydiver also enjoy challenges in skydive, to improve your
>skill, which will lead to different kind of fun.  I had a good fun
>jump a couple weeks ago, 20 way smiley face dive :) (well, you asked
>for it so...) It takes relatively skilled skydivers and good planning
>and dirt dives.  We couldn't just go for it with 1 minute dirt dive,
>but it was fun.
>
>This year, I joined a intermediate 4 way team and planning to compete
>in U.S. National this fall.  Since the know-how of competition 4 way
>skydiving is not that available in New England area, we pretty much
>started in the dark, putting our heads togather over the part 55 dive
>pool.  We bought 1991 National tape and studied it frame by frame.  We
>made creepers and trying to learn how to creep.  Yes, occasionally we
>go up and skydive, but we hire camerajumper for almost all our dives,
>and study the result frame by frame.  It's a whole different skydive
>for me.
>

And the bragging continues . . . .    :^)

>There are so many thing we have to think and plan between one point
>and next point.  And we can't simply copy what Knights do, but we have
>to make our own skydive according to our flying skill (which is not
>that great).  My latest finding is the challenge of designing exits.
>Watching the National video, no team does a same exit. (it was nice
>relief to know that even Knights funneled an 4 way exit at the
>National) It is very individual and there are no definitive answer to
>it.  It is a fine balancing of risk (funnel) and time.
>
>I know that all these sounds way too serious for many of the
>skydivers, and gets a comment such as Eric's.  But I like these
>challenges and I enjoy it.  I'm having fun, seriously.  Please don't
>alienate a jumper like me because I'm serious.  The most painful thing

Serious ain't a problem!  Maybe a bit geeky.    :^)

>about being on a team, for me, is that I have much less opportunity to
>jump with my friends who's not in the team.  I want to jump with them
>as much as I used to, but time and resources are limited.
>
>
>I knew it is not computationally feasible including all the factors
>described in Jerry's description in his followup, thus, it is joke.
>(ok, that my sence of humor)  Anyway, blue skies and have fun.
>
From: bonitz@ebony.eecs.ucdavis.edu (Bob Bonitz)
Newsgroups: rec.skydiving
Subject: Re: HELP: Things to consider when buying a hand altimeter?
Date: 12 Sep 92 17:04:30 GMT
Organization: UC Davis  Robotics Research Lab

In article <1992Sep11.153627.27363@Rapnet.Sanders.Lockheed.Com> traurig@ncavax.decnet.lockheed.com writes:
}
}These are all of the altimeter mounting positions I've seen in regular use:
}
}			Chest
}			Mud Flap
}			Wrist/Hand
}			Hip
}			None!
}
}Does anyone have any others they've seen?  No joke positions allowed, it has
}to be in regular use by at 1 person.  

Don't forget mounting your altimeter on your reserve for those who use a
chest-mounted reserve.  There are still a few jumpers who use a chest-
mounted reserve.  Usually style & accuracy jumpers.  Some used to put a
stop watch there, also.  You not only had a display of your altitude, but
how much time had elasped.  I always found the stopwatch difficult to read
in freefall.  It did answer the question of how much freefall time
you got on the jump, however.  That is, if you remembered to look at it after
opening!
From: csa18@seq1.keele.ac.uk (R.J. Husmo)
Newsgroups: rec.skydiving
Subject: Re: dreams
Date: 5 Sep 92 09:54:28 GMT
Organization: University of Keele, England

In article <1992Sep4.012837.11267@mercury.cair.du.edu>, tjreynol@zephyr.cair.du.edu (The Jumpin Dude) writes:
> Richard's article finally got me; I've had about 10 skydiving nightmares.
> anyone else?

No. I haven't had any skydiving nightmares. On the contrary. Know those
Freudian nightmares where you fall without control? And keep falling and 
falling? (They've probably got some sexual connotation or other, but
never mind that for now!) Those nightmares have changed slightly for me
since I started skydiving - I now fall _with_ control. Complete control.
I've even started to look forward to those 'nightmares!' :-)

Unfortunately I usually cannot remember my dreams. :-(

Radar
--
Semper in fecalum, solus altam variat
From: fsjfz@acad3.alaska.edu
Newsgroups: rec.skydiving
Subject: Re: sinus pressure
Date: 14 Sep 92 19:11:56 GMT
Organization: University of Alaska Fairbanks

In article <1992Sep14.163316.15822@mercury.cair.du.edu>, tjreynol@zephyr.cair.du.edu (The Jumpin Dude) writes:
> last thursday i got something of a cold, and was pretty congested 
> on saturday when i went jumpin; my first freefall was pure agony
> by 6,000', i thought my head was going to explode. something
> seems to have. i took some decongestant stuff (suphedrine?)
> and things were fine after that. then sunday, i took more pills
> before making a jump; after each jump, i had a mild pressure
> that i had thought due to my taking the foam thing off of my 
> over-the-glasses Kroops, but i started spitting a bit of blood
> and on my third jump, i had blood running up my goggles :-(
> 
> this ever happened to anyone else? 
> 
> tim, still bloody nosed

Geez, i have to hide colds from my corpsman for military static line jumps at
1250 feet!  Won't let us jump if we're stuffed up at all.  What altitude did
you drop from originally?  i've seen people get bloody noses from bad colds and
jumping before.  i've been told that it's not friendly on your sinuses.

James Zuelow
FSJFZ@acad3.alaska.edu
From: jmills@cass.ma02.bull.com (John Luke Mills)
Newsgroups: rec.skydiving
Subject: Re: sinus pressure
Summary: Pseudophed jumping limits
Date: 14 Sep 92 21:37:39 GMT
Organization: Bull World Wide Information Systems Inc.


My idea on jumping with plugged up sinuses is don't unless a relatively
mild dose of medication will clear it up.  I personally use 60mg of
Pseudophed first thing in the morning a few hours before the first
jump.  Every two hours after that I take another 30mg.  The normal
over-the-counter dose of Pseudophed is 60mg every 4 hours.  I figure
the 30mg every two hours will provide a more even dosage.  If this
doesn't produce a freed up felling on the ground, I don't jump.  

Years ago I was in intense pain under canopy due to an ear squeeze.  I
think I even noticed the pain in freefall.  I had to valsalva so hard
to clear the plugged ear that the other hurt almost as bad before
things cleared up.

I also admit that my thinking on this is probably very slanted due to
witnessing a fatality that was probably at least partially
attributable to cold medications.

--
From: suhler@pollux.usc.edu (Paul A. Suhler)
Newsgroups: rec.skydiving
Subject: Crash in Illinois
Date: 7 Sep 1992 18:17:06 -0700
Organization: University of Southern California, Los Angeles, CA
Distribution: na
NNTP-Posting-Host: pollux.usc.edu
Summary: Twelve Dead

I caught a brief announcement on the evening news here in LA.
 
It looked like a Beech D-18 (part of the twin tail sticking up
in the air).  They said that twelve skydivers died (no mention
of the pilot).  No cause reported, simply that whatever happened
occurred too low for anyone to bail out.

Bad year.

Paul Suhler
From: SKYDIVE@f15.n233.z1.fidonet.org (SKYDIVE)
Newsgroups: rec.skydiving
Subject: Re: dreams
Date: 11 Sep 92 22:34:21 GMT

Reply-to: Hector.Mandel@p0.f15.n233.z1.fidonet.org (Hector Mandel)
Fido-To: romulus!umiacs.umd.edu!jerrys

In a message of <11 Sep 92  14:12:26>, romulus!umiacs.umd.edu!jerrys (1:233/15) writes:

 >...
 >>I hit the ground and bounce up and down 
 >>like a basketball.  I stop bouncing after 4 or 5 times and I'm 
 >uninjured.

I've heard that if you grab on to the grass real tight when you first hit, you  
won't bounce.  Is this true?
 

--- msged 1.99S ZTC
--- eecp 1.45 LM2 

 * Origin: A skydiver is taken by the gravity of his situation
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From: SKYDIVE@f15.n233.z1.fidonet.org (SKYDIVE)
Newsgroups: rec.skydiving
Subject: Re: Spotting and Ground Speed
Date: 13 Sep 92 01:13:10 GMT

Reply-to: Bill.Caefer@p0.f853.n102.z1.fidonet.org (Bill Caefer)
Fido-To: romulus!leland.stanford.edu!eap

 r> I do somewhat agree that "ground speed" can be misleading, but maybe
 r> we could say "The rate at wich the aircraft is penetrating the wind".
 r> This is, however, directly related to ground speed.

Wrong on both counts.  The rate at which the aircraft is penetrating the wind is the exact definition of "Airspeed."  

And groundspeed may be related to airspeed but it is greatly affected by the wind speed.

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--- eecp 1.45 LM2 

 * Origin: <X> Infinity Ltd.  HST/DS (1:102/853)
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Newsgroups: rec.skydiving
From: mark@virtech.uucp (Mark Smith)
Subject: Re: Computerized LogBook
Reply-To: mark@vti.com
Organization: Virtual Technologies, Inc.
X-Newsreader: Tin 1.1 PL5
Date: Thu, 10 Sep 1992 00:33:22 GMT

Daniel Briggs (dbriggs@zia.aoc.nrao.edu) wrote:
: In article <BuBpHK.28I@virtech.uucp>
:   mark@vti.com writes:
: >Okay, so it's not windows... hey, it's not even mine.  I grabbed it
: >ages ago from r.s.  I don't even remember ever typing in my data to
: >it; goodness knows why I've kept it so long.  No guarantees.
: >
: >========================= jumplog.c ==================================
: >/* Logbook program - Joe Peterson */
: 
: Cute.  Maybe even useful -- I dunno.

The original q about a DOS windows application would be very cool.
Actually, cooler yet would be a neato X-application to do it.  It
could be a tabular-input-form-like editor.

: worrying about this kinda stuff to be worthwhile.)  But it occurs to me
: that such programs should calculate freefall time for you.

It seems to me that the best way is to input the ff number, but that's
a hassle.  Dan's right, what are computers for anyway if not for these
kinds of tasks?  The only problem is that different rates apply for
different actions.

The machine should figure ff rates out w/ a table not unlike the tables
found in the back of logbooks.  I think that's how everyone figures
them out anyway, right?

I guess this program could become a neato program given lots of work.
Any takers out there?

As long as we're talking about computers and skydiving... I know of
one dz which has a computerized interface to the manifester.  There
is no paper involved.  A jumper at Gardner NY exchanged jumps for
a complex program to handle everything.  And that's what they use
right now.  Are there any other computerized systems out there?
-- 
      /_\   Virtual                  Mark Smith          USPA D-13761
    /-~_  \    Technologies          mark@vti.com
  /      ~-_\     Incorporated       703-430-9247,   FAX 703-450-4560
/_____________\      46030 Manekin Plaza, Suite 160, Dulles, VA 20166
From: SKYDIVE@f15.n233.z1.fidonet.org (SKYDIVE)
Newsgroups: rec.skydiving
Subject: 11-Cell Canopy Question
Date: 4 Sep 92 22:06:12 GMT

Reply-to: Bill.Caefer@p0.f853.n102.z1.fidonet.org (Bill Caefer)
Fido-To: romulus!acad3.alaska.edu!fsbgf

 r> Does anyone out there jump an 11 cell canopy (like the 
 r> AR11)?? I'm just asking
 r> out of curiosity. Here at our small DZ we don't see a large variety of
 r> gear and I'm just trying to get some idea of what's out 
 r> there and what's new.

Well, the only one I've seen was at Quincy.  Kate Cooper was jumping it and it had NO flare at all.  That's a small sample, but hey.

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Newsgroups: rec.skydiving
From: tjreynol@zephyr.cair.du.edu (The Jumpin Dude)
Subject: Re: HELP: Things to consider when buying a hand altimeter?
Organization: University of Denver
Date: Tue, 15 Sep 92 15:58:16 GMT

In article <1992Sep15.152622.28347@mercury.cair.du.edu> jvilhube@diana.cair.du.edu (Jan Vilhuber) writes:
>>
>Sounds like Mike Driver. He jumps here in Colo, USA, and was my tandem
>master for rthe first two jumps. He always has his altimeter on his thigh.

Mike made his 1000th tandem over the weekend. i think he's earned a piece 
of pie. a  real big piece. big circular piece of pie.

>-- 
> Jan Vilhuber            | Internet: jvilhube@du.edu or jvilhube@[130.253.1.4]
> (The skydivin' Bass)      | Bitnet  : jvilhube@DUCAIR
>--------------------------------------------------


Newsgroups: rec.skydiving
From: belboz@frc2.frc.ri.cmu.edu (Barry Brumitt)
Subject: Re: You may pick up your pencils...
Reply-To: belboz@frc2.frc.ri.cmu.edu (Barry  Brumitt)
Organization: Field Robotics Center, CMU
Date: Wed, 9 Sep 1992 14:57:53 GMT

In article <4190013@hpcc01.corp.hp.com> boucher@hpcc01.corp.hp.com (Richard A Boucher Jr) writes:


   I forgot to mention another reason I wanted to ask the question... I've been
   calling around about used gear and in the past 2 months I've spoken with 2 
   guys who did about 30 and 50 jumps, respectively, had a reserve ride, and 
   placed their gear up for sale immediately.  

   Got me to wondering if the folks with 1000 jumps go through the same soul
   searching that the newbies do after their first reserve ride. 


   -RB


I've got about 350 jumps, and had two reserve rides between #344 and
#348. I did a bit of soul searching, but not very much -- I'd already
steadied myself to be expecting one at any time -- so it really wasn't
much of a surprise (though the second *was* quite a surprise!)

Perhaps there's an inverse relationship between
"trama-from-reserve-ride" and "number of jumps."


Barry

--
Barry Brumitt		             belboz@frc2.frc.ri.cmu.edu
RI Graduate Student		     (or) bb1v@andrew.cmu.edu
Field Robotics Center                Phone: (412) 268-7144
Carnegie Mellon University	     "Who is John Galt?" $ Skydive!

Boring Disclaimer: The opinions contained herein do not necessarily
=-=-=-=-=-=-=-=-=  represent those of the FRC, SCS, RI or even CMU. 




Newsgroups: rec.skydiving