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Frequently Asked Questions (FAQS);faqs.103



Other Information provided in this file are:
    -.    Appendix of abbreviations
    -.     Information about rec.skydiving FTP/archive site.
    -.      Disclaimer




-.    How does one learn to skydive?
    ------------------------------

One looks in the telephone directory (Yellow Pages) under "Parachuting" or
"Skydiving and Parachute Jumping Instructions" to find a local parachuting
operation - normally referred to as a   "drop zone" (DZ).  A phone call will
generally provide you with enough   information to make arrangements to
attend the First Jump Course   and/or how to reach the DZ.  You can also
call the  United States   Parachute Association (USPA, 1440 Duke St.,
Alexandria, VA  22314)  at (703)-836-3495 to get the name of an affiliated
drop zone in your   area.  A friend or acquaintance who has jumped
previously may also  be able to give you a recommendation.

Most DZs will offer the First Jump Course (FJC) at least once
each weekend.  Some will offer it during the week or several times
during the weekend.  You will need to contact your local DZ to determine
their scheduling.  The FJC consists of about 4-6 hours of ground
school followed by your jump - weather permitting.

There are several different types of training you can take: Static Line,
Accelerated Freefall, or Tandem.  They are described below in greater
detail.  However, not all drop zones offer all these options, so you
should ask the DZ which type(s) of training they provide.

Some drop zones have promotional videos they will sell you (~$10) that
describe the training and show you what it is all about.  Almost every
DZ these days use videos for training aids and will be glad to let
you view them (for free!) if you stop by.  They will mail you a brochure
and other detailed information upon request as well.

It is *your* safety at stake and *your* responsibility to look after it.
If you have reservations about making your first jump, make the effort
to visit the DZ, check it out, meet the people and staff.  They will be glad
to see you, and you will be *much* more   confident and comfortable having
done so, and consequently have a much better time!


-.    What are the physical requirements?
    -----------------------------------

In general, the prospective student should be in reasonably good physical
shape, this *is* a sport after all.  You will be required  wear 35 lbs of
equipment, endure opening shock, maneuver the canopy,  land, and possibly
trudge great distances on foot.  You will experience30 degree swings in
temperature, atmospheric pressure changes, 4 hours of lecture, and lots of
beer.  It's grueling (:-).

But seriously, problems may arise where a prospect is too heavy (over
~250lbs/110kg) or if they have medical conditions which may impair them during
the activity.  Someone who experiences faintingspells, blackouts, or has a
weak heart should not be jumping.  Someone withrespiratory illness *may* have
a problem due to atmospheric changes at altitude.The better your physical
condition, the more you will enjoy the experience.  This being said, very few
people have medical or physical conditions which actually preclude jumping.

Most dropzones will try to work with you.  If you have a question,
ask them, and as always, ask your doctor.  You may be surprised at
the relatively few physical constraints involved.


-.    What does the training consist of?
    ----------------------------------

The FJC teaches the student every thing they need to know to safely
make their first jump. There are several different programs
available for first jumpers, the one you choose will depend on your
personal preferences and circumstances.  The differences of each is
summarized below:

    Static Line (S/L)

This method has evolved over the last ~30 years from its military
origins into a successful method for training sport parachutists.
The student gets 4-5 hours of ground training and is then taken to
an altitude of 3000 feet for the jump.  The jump itself consists of
a simple "poised" exit from the strut of a small single engine
Cessna aircraft.  As the student falls away from the plane, the main
canopy is deployed by a "static line" attached to the aircraft.
The student will experience about two to three seconds of falling
as the parachute opens.

Subsequent S/L jumps consist of about 15 minutes of preparation.
After 2 good static line jumps, the student will be trained to pull
their ripcord for themselves.  The student then does 3 more static
line jumps where they demonstrate this ability by pulling a dummy
ripcord as they leave the plane (the static line is still initiating
the deployment).  The student is then cleared to do their first
actual freefall.

The first freefall is a "clear & pull", where the student initiates the
pull sequence immediately upon leaving the aircraft.  Next is a 5 second
delay jump.  Subsequent jumps go to progressively higher altitudes with
longer delays.  After 20 freefalls, and meeting certain other basic
requirements, the student receives their A license and is cleared off
student status.

    Accelerated Free Fall (AFF)

The AFF program was instituted in 1982 as an "accelerated" learning
process as compared to the traditional static line progression.  The
AFF program will give you a true taste of modern sport skydiving.

The ground training is a bit more extensive than S/L (~5 hours)
because the student will be doing a 50 second freefall (that's right!)
on his/her very first jump.  The student will exit the aircraft at
10,000-12,000 feet along with two AFF Jumpmasters (JM) who will
assist the student during freefall.  The jumpmasters maintain grips
on the student from the moment they leave the aircraft until opening,
assisting the student as necessary to fall stable, perform practice
ripcord pulls, monitor altitude, etc.  The student then pulls his/her
own ripcord at about 4000 ft.

The AFF program is a 7 level program.  Levels 1, 2, & 3 require two
freefall Jumpmasters to accompany the student.  These dives concentrate
on teaching basic safety skills such as altitude awareness, body position,
stability during freefall and during the pull sequence, and most
importantly- successful ripcord pull.  On level 3, the JMs will
release the student in freefall for the first time, to fly completely on
their own.

Levels 4, 5, 6, & 7 require only one freefall JM (less $$) and teach
the student air skills such as turns, forward movement and docking on
other people, frontloops, backloops, "superman" exits from the plane,
etc.

Each AFF level is designed to take one jump, and requires about
45 minutes of training.  After successfully performing the objectives
of each level, the student moves on to the next level.

After graduating Level 7, the student enters a more free format stage
called "Level 8" where they practice and hone their skills by themselves
and in small groups until they obtain 20 freefalls and qualify for their
A license.

    Tandem jumps.

Tandem jumps are meant to offer an introduction to the sport.  They allow the
neophyte to "take a ride" with an experienced jumper.  A tandem
jump requires from 15 to 45 minutes of ground preparation (it is not
actually a First Jump Course).  It consists of an experienced jumper
called a "tandem master" (or pilot) and the student (or passenger).
The passenger and pilot each wear a harness, however only the pilot
wears the parachutes.  The student's harness attaches to the front of
the pilot's harness and the two of them freefall *together* for 30
seconds, open together, and land together under one Really_BIG_Parachute.

Tandems are particularly advantageous to the adventurous spirit who cannot
adequately meet the physical or proficiency requirements for the S/L
or AFF jumps.  They can hop aboard a tandem!

Because the tandem training is not a First Jump Course, if you decide to
pursue the sport, you will still have to attend a FJC.


In all of these training methods, students are taught normal and emergency
procedures for all aspects of the jump - climb to altitude, exit, opening,
canopy control, and landing.  They are also shown the equipment and go
over it so that they understand how it works.

Nearly all student training centers now utilize *sport* skydiving gear.
No more military surplus stuff.  Students have light-weight harness/container
systems in aesthetic colors, high performance canopies designed for
students.  No more paraboots- students use their own tennis shoes.  No
more heavy motorcycle helmets- students use lightweight sporting helmets.
Ground-to-air radio for canopy control assistance, air-to-air video, on
and on...


-.    How do I tell a good Drop Zone from poor one?
    ---------------------------------------------

Most dropzones that provide regular student training are "USPA Affiliated".
The United States Parachute Association (USPA) is the representative body
for sport parachuting within the US, and a member of the FAI (the
international equivalent). The USPA defends the sport's interests before
the FAA and other regulating/lawmaking bodies at all levels of government.
It also develops and monitors safety and training doctrine for the sport.
Other benefits include liability insurance for students and DZs in the
case of damage to property, the monthly magazine "Parachutist", etc.

The USPA has had tremendous success instituting rating programs
for Jumpmasters, Instructors, and Instructor-Examiners to ensure that
only properly trained and qualified personnel work with students.  You
should insist on USPA Instructors and Jumpmasters.

USPA affiliation is not required, and does not *guarantee* a DZ to be a
"good" DZ, and non-affiliation does not mean the DZ is "bad".  However,
the USPA, through their diligence and caution, has compiled an
excellent safety record over the years.

These are just guidelines.  You should always check it out before
you jump.


-.    What if your parachute doesn't open?
    ------------------------------------

Clearly, this is the most Frequently-Asked-Question posed by
all prospective jumpers.

By law (FAA regulations), all intentional parachute jumps must be made
with a single harness, dual parachute system with both a
main canopy *AND* a reserve canopy.  In other words, you have a second
(or spare) canopy in case the first one fails to open properly.

However, it must be noted that the technology utilized in today's sport
parachuting equipment is light years ahead of the old military surplus
gear used in the '60s and '70s.  The canopies are DRASTICLY different from
the classic G.I. Joe round parachutes.  The materials are stronger, lighter
and last longer, the packing procedures are simpler, the deployment
sequence is much more refined, etc.

The reserve canopies are even more carefully designed and packed.  The
reserve parachute must be inspected and repacked every 120 days by an
FAA rated parachute Rigger - even if it has not been used during that time.

The student's main canopy is always packed either by a rigger or under
a rigger's direct supervision by experienced packers.

There are also additional safety features employed to ensure canopy
deployment such as Automatic Activations Devices (AAD) and Reserve
Static Lines (RSL) which add still more layers of safety.


-.    How much does it cost?
    ----------------------

Prices vary from DZ to DZ.  Typically, the S/L course runs ~$110-$140,
AFF from $250-$300, and the tandem from ~$140-$200.  Some DZs can provide
a freefall videoman to tape the whole exciting experience for $50-75.
These prices include the ground school and the first jump.

After completing their first jump, skydiving tradition allows each
student to express their appreciation and admiration for their newfound
skydiving friends for their assistance in successfully achieving this
milestone in their life by purchasing (from a local establishment) and
presenting to them a case of beer.  This case, customarily a fine
imported beer, is ceremoniously iced down for consumption at the end of
the day.  The cost generally runs $15-20.

(It should be noted that while jumpers have a reputation for major
no-holds-barred parties, the use of drugs and/or alcohol on the DZ
premises is *strictly* prohibited during jump operations for what should
be obvious reasons. This rule is observed and enforced by both jumpers
and management.)

After the first jump, the cost of each successive jump decreases in
stages as less supervision is required.  Once off student status, and
owning your own gear, jumps will cost about $15-17 to 13,000' (about
65 seconds of freefall).  Many drop zones have discount programs as well
that can further decrease the cost of jumps.

Equipment can run from $1000 to $3500 depending on what you want to
spend.  There is a used equipment market (much like the used car market)
which can SAVE you loads of money, or you can custom order everything
brand-spankin-new with your own personalized colors and sizes, which
will COST you loads of money(:-).  You can buy it all at once or
a piece at a time as finances allow.  Generally, you shouldn't worry
about buying gear until you are off student status or close to your
A license.

Of course, all prices are in US dollars (as opposed to dinars or rubles:-).


-.    How hard is the landing?
    ------------------------

The canopies used today bear little resemblance to the classic round
canopies of years gone by.  Today, nearly all jumpers and jump schools
use "square" canopies for parachuting.  These canopies are actually
rectangular in shape, and when open, act like an airplane wing (or
an airfoil).  They are more like gliders than umbrellas.

The aerodynamics of the square canopy provide it with exceptional
maneuverability, allowing the jumpers to land almost anywhere
they wish.  This wing shape also provides tippy-toe soft
landings for even the novice jumper.  The days of landing like a sack
of flour are history.  Most students land standing up on their first jump.


-.    How do you breathe in freefall?
    ------------------------------

This falls into the realm of urban folklore.  One CAN breathe in
freefall - if it were necessary.  However, due to the high
speed of terminal freefall (and much higher speeds in vertical
freefall dives), the jumper's body is exposed to O2 molecules at
a much higher rate than someone walking around on the ground.
The body is able to absorb the necessary O2 through the skin.  This is
why jumpers flap their cheeks in freefall, it presents a larger surface
area to the airstream for oxygen osmosis.  Once under canopy, the
jumper resumes breathing normally. (:-)

This is also why jumpers do not jump on cloudy days or when they
might risk going through clouds.  The moisture in the clouds can
condense on their exposed skin surfaces preventing the absorption of the
necessary oxygen resulting in suffocation.  AADs are recommended for
jumpers in climates where weather is a factor.

(:-)


-.    Appendix of Skydiving Abbreviations, Terms, and Coloquialisms
    -------------------------------------------------------------

AAD    Abbrev. n, "Automatic Activation Device".  A altitude sensing
    device used to automaticly activate the opening sequence
    for a parachute.  Most commonly refers to their application
    to sport reserve parachutes, but also used in other non-sport
    scenarios such as ejection seats, etc.

AFF    Abbrev. n, "Accelerated FreeFall".  A training program for first
    jump students where the skydiving skills development rate is
    accelerated over that of the older static line program.

boogie    n, A gathering of jumpers for the purposes of jumping and
    socializing.  Typically, boogies will have large aircraft, unusual
    aircraft (balloons, helicopters), special events (record attempts),
    or some sort of competition as a focal point to attract jumpers
    from widely diverse regions.

bounce  Coloquialism v, term for landing, after freefall, without the aid
    of a parachute.  Also: hammer in, frapp, go in.

CRW    Abbrev., "Canopy Relative Work".  Describes the manuvering done
    by jumpers *under canopy* to fly their parachutes together to
    form various formations.  Sometimes referred to as CReW (Crew).

DZ    Abbrev. n, "Drop Zone".  A place where parachuting operations take
    place.  This is may be a designated area, or frequently, a
    commercial business which supplies aircraft, instruction, gear
    sales and services.

JM    Abbrev. n, "JumpMaster".  A jumper trained and certified to
    supervise students and/or novices during their jump.

main    n, the primary parachute.

opening shock n, The force experienced by the jumper due to the sudden
    deceleration from terminal velocity due to the deployment of a
    parachute.

RW    Abbrev., "Relative Work".  Describes the freefall maneuvering
    whereby two or more jumpers fly relative to each other *in freefall*
    in order to form various formations.

reserve    n, the secondary, or backup, parachute.

round    n, a class of parachutes designed to simply decelerate a
    body in a fluid medium.  The classic parachute.

square    n, a class of parachutes designed to inflate and take the shape
    of an airfoil.  These are more accurately rectangular in
    shape and are semi-rigid wings.

USPA    Abbrev. n, "United States Parachute Association".

whuffo  Coloquialism, n, A person who is not a skydiver (from the
    often-asked phrase "Whuffo you jump out of them airplains?"


-.    rec.skydiving FTP site and archive.
    -----------------------------------

There is an FTP site for rec.skydiving located on skydive.eng.ufl.edu
(128.227.116.1) which contains:
    1. Most recent FAQ
    2. Archive of all rec.skydiving messages since Sept. 1992.
    3. DZ reviews
    4. A collection of skydiving GIF's.

This sites accepts anonymous FTP's, and the information can be found
in the skydive/ directory. Questions and comments cocerning this site
can be directed to the FTP site maintainer [e-mail].


-.    Disclaimer.
    -----------

All information provided herein is offered on an "as is" basis. There
is no warrenty expressed or implied concerning it's applicability or
fitness for any particular purpose. Consult a trained professional
before attempting any of the activities described in this document; it
is not intended to be a substitute for proper professional instruction.

        --------      End    ---------
            Rec.Skydiving F.A.Q. Sheet





--
Barry Brumitt                        [e-mail]
RI Graduate Student                  (or) [e-mail]
Field Robotics Center                Phone: [phone]
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.
Xref: bloom-picayune.mit.edu comp.lang.smalltalk:5815 news.answers:4329
Path: bloom-picayune.mit.edu!enterpoop.mit.edu!spool.mu.edu!agate!con.Berkeley.EDU!latta
From: [e-mail] (Craig R. Latta)
Newsgroups: comp.lang.smalltalk,news.answers
Subject: Smalltalk Frequently-Asked Questions (FAQ)
Supersedes: <[e-mail]>
Followup-To: poster
Date: 1 Dec 1992 12:44:31 GMT
Organization: University of California, Berkeley
Lines: 847
Approved: [e-mail]
Distribution: world
Expires: 25 Dec 1992 12:45:14 GMT
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: con.berkeley.edu
Summary: This posting contains a list of frequently-asked questions
        (and their answers) about the Smalltalk programming
        language and environment. It should be read by posters
        to comp.lang.smalltalk.
Originator: [e-mail]

Archive-name: smalltalk-faq
Last-modified: 1992/12/1
Version: 3.0


***

    This is a Smalltalk frequently-asked-questions (FAQ) sheet,
distributed by Craig Latta ([e-mail]). It is posted
fortnightly to the USENET newsgroups comp.lang.smalltalk and
news.answers.
    It is also available via ftp as
anonymous@xcf:misc/smalltalk/FAQ/FAQ.entire. Finally, it can be
obtained by mail by emailing smalltalk-request@xcf with the subject
line "request for FAQ". The machine xcf.Berkeley.EDU has IP address
128.32.138.1.

        Please send contributions, suggestions and comments to
[e-mail]. Raw FAQ submissions (which I have
not yet incorporated into this document) are available (in 'mh'
message format) via 'ftp' as
[e-mail]:misc/smalltalk/FAQ/raw/*.
    Comments and suggestions are greatly appreciated. I realize
that information has a short half-life.

    Disclaimer: I am an employee of ParcPlace Systems, Inc., but I
am solely responsible for this FAQ and its contents. In August 1992, I
solicited comments about the appropriateness of my maintaining and
posting this FAQ. The feedback I got was unanimously approving.


        Thanks,

-C


    New items are marked with a '+'. Modified existing items are
marked with a '*'.

    Contents:

0.0)    [Meta-issues]
0.1)        How can I browse ftp sites and their data without
            using my own disk space (unless I want to keep
            data), and locate files on ftp sites, given
            pathname fragments?

1.0)     [Archival]
1.1)        How can I get GNU Smalltalk?
1.2)        What Smalltalk archives are there?

2.0)     [Projects]
2.1)        What is Smallmusic?

3.0)     [References]
3.1)        Can someone recommend a good introduction to
            Model-View-Controller concepts?
3.2)        Is there a Smalltalk bibliography?
3.3)+        What are the "blue book", "purple book", etc?

4.0)+    [Programming issues]
4.1)+        What are some "classic Smalltalk bugs", both in the
            system and programmer domains?

---

0.0) [Meta-issues]

---

0.1)        How can I browse ftp sites and their data without
            using my own disk space (unless I want to keep
            data), and locate files on ftp sites, given
            pathname fragments?

Answer:

    This question might seem tangential at first (and I suppose it
is). But it is vitally important, as resources such as papers,
documentation, code and software tools become more numerous and
distributed.

        There is a set of Emacs-Lisp ("elisp") code, called
"ange-ftp.el", which makes 'ftp' use transparent within GNU Emacs (GNU
Emacs is available via anonymous ftp from prep.ai.mit.edu). This
package attempts to make accessing files and directories using FTP
from within GNU Emacs as simple and transparent as possible.  A subset
of the common file-handling routines are extended to interact with
FTP. Using these routines, one is able to access remote files and one
would any other local file, without having to write it locally to
disk. The result is an immense virtual global filesystem.
        The routines are available via anonymous ftp (naturally!) as
tut.cis.ohio-state.edu:/gnu/emacs/elisp-archive/as-is/ange-ftp.el.Z,
(incidentally, if you already had "ange-ftp.el", you could paste the
above line in response to Emacs' 'copy-file', stick "/anonyous@" in
front of it, and copy the file.) My current version is dated 22
October 1991.
        Another useful bit of elisp is "saveconf.el". It saves the
Emacs buffer list and window configuration between editing sessions.
So, one can have several buffers, with several files open (as I
usually do), quit and restart Emacs, and have the state preserved,
cursor locations and windows included. Happily, it works well with
"ange-ftp.el", so that even remote files are restored (after possibly
having to prompt for passwords). "context.el" is also available via
anonymous ftp from cis.ohio-state.edu, as
pub/gnu/emacs/elisp-archive/saveconf.el.Z. Also look for
"tree-dired.el" which provides for hierarchical directory editing.
        Incidentally, it was very easy to produce references for the
above tools, thanks to another tool called "archie", developed at
McGill University. Dubbed a "resource discovery tool" by its authors,
it comes in very handy when one knows what tools are needed but not
their availability. Archie consists of a server for this information
(basically from a database of directory trees from "all known"
anonymous ftp sites, updated once per month), and a client, which may
be run via 'telnet' from the server machine itself (frowned upon...),
or from a standalone client available from that machine (...highly
encouraged, for the considerable host load win). Some clients even
perform ftp tasks based on user response to search results. There are
clients available for dumb and X terminals as well as for (of course)
Emacs. Poke around archie.mcgill.ca for a client and documentation.

    Porting these tools (or at least new interfaces to them) to
Smalltalk would be a great project. I'm working on it in my spare
time. I'd love to hear from any interested people.


-Craig


---

1.0)     [Archival]

---

1.1)        How can I get GNU Smalltalk?

Answer:

    The most current location, to my knowledge, is
[e-mail]:pub/gnu/smalltalk-1.1.1.tar.Z. Please direct
problems to the author, Steven Byrne, at [e-mail].


---

1.2)        What Smalltalk archives are there?

Answer:

    There are many. Most of them simply archive GNU smalltalk, but
there are also a few large archives containing many interesting and
varied sources. All of the sites may be retrieved by invoking 'archie
smalltalk' (see above reference to 'archie').
    For convenience, descriptions of a few of the archives follow.
If you have a site/announcement you'd like included, please let me
know.


**

Directory: [e-mail]:misc/smalltalk
Summary:

    Smalltalk FAQ, smallmusic discussion archive.

**

Host: mushroom.cs.man.ac.uk
Summary: The Manchester Smalltalk archive. Information about it is
    posted regularly to comp.lang.smalltalk.

**

File: [e-mail]:pub/Index
Summary: Information about the UIUC Smalltalk archive (which has local
    files and a mirror of the Manchester archive).

**

File: [e-mail]:pub/st80/README
Summary: Information about various Smalltalk-related offerings,
    including the Musical Object Development Environment (MODE).


---

2.0)     [Projects]

---

2.1)        What is Smallmusic?

Answer:

    A work group has formed to discuss and develop an
object-oriented software system for music. The current environment is
Smalltalk 80. The email address for the group is
[e-mail].  If you are interested in joining the
discussion, email [e-mail], with the
subject line "add me".

    The abstract and outline to a recent version of our working
paper follows. The document is available via ftp as
[e-mail]:pub/st80/OOMR6.t.


    Thanks,

    Craig Latta
    [e-mail]

***

Abstract to the working document

    This document describes an object-oriented description
language for musical parameters, events and structures known as the
Smallmusic Object Kernel (SmOKe) .  In object-oriented software terms,
the representation is described in terms of software class hierarchies
of objects that share state and behavior and implement the description
language as their protocol.
    The authors believe this representation, and its proposed
linear ASCII description in Smalltalk-80 syntax, to be well-suited as
a basis for: (1) concrete description languages in other languages,
(2) specially-designed binary storage and interchange formats, and (3)
use within and between interactive multi-media, hypermedia
applications in several application domains.


---

3.0)     [References]

---

3.1)        Can someone recommend a good introduction to
            Model-View-Controller concepts?

Answer:

From: [e-mail] (Dr. Raimund K. Ege)
Newsgroups: comp.lang.smalltalk
Subject: Re: MVC -- good introductions?
Date: 8 Mar 92 18:26:40 GMT
Organization: Florida International Univ.

Look at Chapter 10 in the following book that just came out:

Programming in an Object-Oriented Environment,
by Raimund K. Ege

Academic Press, Inc., San Diego, CA, 1992, hardcover,
ISBN 0-12-232930-9

To order call 1-800-321-5068.

(also: Academic Press Limited, London, United Kingdom)

It presents a complete and thorough introduction to all object-oriented
concepts. It contains a large
example/case study, and a comparison of major OO programming languages.

In addition, the book extends the object-oriented view
to all elements of the programming environment: data structures
and algorithms, programming tools, user interfaces, data bases and
software design.