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LAUNCHER simulates a single stage-to-orbit launch vehicle. This is a
very good quality simulation to learn the "feel" for orbital
mechanics. You can design your own vehicle and pilot it to orbit and
rendezvous with the space station. An interest in orbital mechanics is
required (knowledge about it would be helpful, but is not mandatory). A
documentation file is included.
A collection of programs inspired by the Computer Recreations column in
"Scientific American." Several data files are included.
~ HYPER -- a hyper cube (fourth-dimensional cube) drawing program.
~ WALLPAP -- an intricate patterns drawing program with a very simple
numeric seed.
~ WATOR -- a biosphere simulation in which fish are eaten by sharks,
which die and reproduce.
~ CLUSTER -- a simulation of the motion of star clusters of two or more
stars.
Files of this disk
LAUNCHER.EXE 73266 8-25-87 4:24p The launcher program
LAUNCHER.DOC 6815 8-25-87 4:21p Doc file for launcher
CLUSTER.EXE 51082 3-29-87 3:13p The star cluster gravity program
STAR.DAT 837 3-29-87 3:36p data file for cluster
2STARS. 57 1-01-86 3:00p data file for cluster
3STARS. 77 1-01-86 3:01p data file for cluster
HYPER.EXE 44820 4-01-87 9:42p Hyper cube drawing program
LANDER.EXE 69664 7-21-87 8:04p Lunar lander program
WALLPAP.EXE 42274 3-29-87 9:55p Wallpaper for the mind program
WATOR.EXE 47222 3-29-87 3:17p Biosphere simulation program
Disk No 945
Program Title: ROCKET SIMULATION
PC-SIG version 1
This disk has programs on physics and space science. Many were inspired
by the "Computer Recreations" column in "Scientific American." Programs
included are: HYPER, a hyper cube (4th- dimensional cube) drawing program;
WALLPAP, a program that draws intricate patterns with a very simple numeric
seed; WATOR, a simulation of a biosphere where fish are eaten by sharks,
sharks die and reproduce; and CLUSTER, a program to simulate the motion of
star clusters of two or more stars. Several data files are included to
demonstrate the program. Also included is another version of the venerable
lunar lander, but this one uses graphics to show the relationship between
altitude and velocity and also has a choice of many different moons and
planets to try your skills at. The main program is LAUNCHER. LAUNCHER
simulates a single stage-to- orbit launch vehicle. This program is a very
good quality simulation to learn the "feel" for orbital mechanics. You may
design your own vehicle and pilot it to orbit to rendezvous with the space
station. An interest in orbital mechanics is required (knowledge would be
helpful but not mandatory). A documentation file is included.
Usage: Entertainment
System Requirements: 128K memory, one disk drive, and color graphics.
How to Start: Type: LANDER (press enter) to run LANDER, LAUNCHER (press
enter) to run LAUNCHER, CLUSTER (press enter) to run CLUSTER, HYPER (press
enter) to run HYPER, WALLPAP (press enter) to run WALLPAP, and WATOR (press
enter) to run WATOR
Suggested Registration: $20.00
File Descriptions:
LAUNCHER EXE The LAUNCHER program.
LAUNCHER DOC Doc file for LAUNCHER.
CLUSTER EXE The star cluster gravity program.
STAR DAT Data file for CLUSTER.
2STARS Data file for CLUSTER.
3STARS Data file for CLUSTER.
HYPER EXE Hyper cube drawing program.
LANDER EXE LUNAR LANDER program.
WALLPAP EXE Wallpaper for the mind program.
WATOR EXE Biosphere simulation program.
PC-SIG
1030D E Duane Avenue
Sunnyvale Ca. 94086
(408) 730-9291
(c) Copyright 1987 PC-SIG Inc.
╔═════════════════════════════════════════════════════════════════════════╗
║ <<<< Disk No 945 ROCKET SIMULATION >>>> ║
╠═════════════════════════════════════════════════════════════════════════╣
║ To print the documentation for LAUNCHER, Type: ║
║ COPY LAUNCHER.DOC LPT1: (press enter) ║
║ ║
║ To run the program, Type: LAUNCHER (press enter) ║
║ ║
║ To run the program LANDER, Type: LANDER (press enter) ║
║ ║
║ To run the program CLUSTER, Type: CLUSTER (press enter) ║
║ ║
║ To run the program HYPER, Type: HYPER (press enter) ║
║ ║
║ To run the program WALLPAP, Type: WALLPAP (press enter) ║
║ ║
║ To run the program WATOR, Type: WATOR (press enter) ║
╚═════════════════════════════════════════════════════════════════════════╝
Launcher
Version 1.0
August 25, 1987
A single stage to orbit launch vehicle simulator. Written by
Robert Castle, CIS 70330,605. The source code for launcher
(written in Quickbasic) is available for a $20 charge from
Robert Castle
306 Lost Rock Dr.
Webster Tx. 77598
This software is for the enjoyment and hopefully the
enlightenment of the user. No warranty of any kind is expressed
or implied.
Getting Started Quickly
-----------------------
The launcher program is written for the IBM PC or compatible. A
CGA card or equivalent is required.
Initial Startup
---------------
The program is started by simply typing "launcher" at the DOS
prompt.
You will be prompted for your name and the name of your next of
kin. Any answer here will do.
You will then be asked if you have EGA capability. If you do hit
the "Y" key. If you don't hit any other key.
Vehicle Selection
-----------------
You will be presented with a vehicle selection menu. Since no
single stage to orbit vehicle currently exists I made up some
reasonable numbers. There are 2 already defined launchers and a
third "make up your own". I suggest you start with the
"advanced" launcher for your first several tries.
Use the arrow keys to position the arrow on the screen to the
vehicle of your choice and hit enter.
Running
-------
You will get a brief page of explanation. After reading it press
enter and you will start the simulator. You have control over
only 2 (but critically important) flight control parameters: the
pitch angle of the vehicle and the throttle.
PITCH ANGLE
-----------
This is the angle of the vehicle relative to the surface of the
earth. An angle of 0 is "level" and an angle of 90 is straight
up. The up and down arrows change this angle by 5 degrees. The
page up and Page down keys change the angle by 1 degree.
THROTTLE
--------
The throttle has only limited control. The HOME key gives you
full throttle, the left arrow key gives you 65% of Full and the
End key shuts down the engines. You can go from 65% to Full and
back as many times as you like but after a SHUTDOWN you can only
go to the ORBIT throttle setting (by pressing HOME). This
throttle setting is designed for Orbit adjust maneuvers. ie do
not shut down until you are in orbit or very close to it. The
throttle will automatically limit itself to keep the "G" level on
the vehicle below limits (usually 3 Gs).
OBJECT
------
The object (other than learning a "feel" for orbital mechanics)
is to get into a 250 nmile circular orbit to rendezvous with a
space station. The program will display how well you did if:
1. you run out of fuel
2. you press escape
HAVE FUN!!!!
DESCRITPION OF DISPLAY AND MORE DETAIL
--------------------------------------
Number Display
--------------
The number display looks like this
Alt= xxxxx Vel= xxxxx
Throt= xxxxx Gs= xxxxxx
Ang= xxxxx Vh= xxxxx
FPA= xxxxx Qbar= xxxx
Ha= xxxxx Hp= xxxx
Alt= Current altitude, in feet if altitude less than 1 nautical
mile, in nautical miles otherwise.
Vel= Current velocity in feet per second. This is the inertial
velocity (in this model the earths rotation is NOT modelled).
Throt= The throttle setting in percent.
Gs= The G level or acceleration level being felt by the
occupants of the vehicle (that is YOU).
Ang= The pitch angle of the vehicle in degrees. This is
relative to the surface of the earth and not inertial.
Vh = The horizontal component of velocity. This is the same as
plotted. In feet per second.
FPA = This is the Flight Path angle of the vehicle in degrees.
This is the angle of your travel relative to horizontal. If the
angle is positive you are climbing toward apogee (your highest
point). If it is negative you are falling toward perigee. Note
this is NOT the same as the pitch angle. That indicates the
direction at which you are THRUSTING. FPA indicates the
direction you are actually going in.
Qbar= This is the aerodynamic pressure on your vehicle. You may
have heard of MAX Q or Maximun aerodynamic pressure mentioned
with regard to space launches. The Qbar is one half the velocity
squared times the atmospheris density. As you velocity goes up
the Qbar will go up but as you climb the atmospheric density goes
down so the Qbar goes down. Qbar is thus only a problem at low
altitudes and high speeds. Keeping the Qbar down is the only
reason to throttle down to 65%.
Ha and Hp. The apogee and perigee altitudes in nautical miles.
These will constantly change as you are thrusting. While you are
climbing into orbit you should think of these as the apogee and
perigee altitudes that would result if you stoped thrusting NOW.
These are the primary things your are trying to target. To be
perfect you should get them both to 250 (the target orbit).
PLOT
----
The Apogee is plotted against the horizontal velocity. The
apogee is the main thing you are trying to target.
ANGLE to APOGEE
---------------
A "clock face" is drawn that shows the angle to apogee. This is
required so you can tell where you are in the orbit. You are at
the "tic mark" at the 12 o'clock point and the hand points to the
apogee or highest point of your orbit. Note that during the
climb into orbit the apogee may move quickly. This does not mean
you have moved around you orbit that quickly but that you have
changed the shape of the orbit by applying thrust.
HINTS
-----
1. Slowly decrease the pitch angle at first. WATCH YOUR QBAR.
Go to 65% throttle only to keep from violating the Qbar limit. Go
back to Full as soon as you can.
2. Watch the plot. You want to hit a 250 nmile apogee at orbital
velocity (about 25000 fps).
3. Watch the angle to apogee and the FPA. You want to keep
apogee in front of you. Bring the pitch angle down to almost
zero after a couple of minutes.
4. Shut down with both apogee and perigee low and use orbit
thrust to tweak them up. F9 will run the simulation at 10 times
normal speed.
5. Remember orbit burns at perigee affect the apogee altitude
and vice versa. To increase altitude burn posigrade (pitch of 0),
to decrease altitude burn retrograde (pitch of 180).
6. Don't be afraid to use negative pitch angles late in the
climb into orbit. This can "push the apogee" around ahead of you
and keep from it getting to high.
Volume in drive A has no label
Directory of A:\
2STARS 57 1-01-86 3:00p
3STARS 77 1-01-86 3:01p
CLUSTER EXE 51082 3-29-87 3:13p
FILES TXT 685 8-25-87 4:36p
FILES945 TXT 2180 12-16-87 8:41a
GO BAT 38 10-19-87 3:56p
GO TXT 1387 12-10-87 4:50p
HYPER EXE 44820 4-01-87 9:42p
LANDER EXE 69664 7-21-87 8:04p
LAUNCHER DOC 6815 8-25-87 4:21p
LAUNCHER EXE 73266 8-25-87 4:24p
READ ME 1267 8-25-87 4:55p
STAR DAT 837 3-29-87 3:36p
WALLPAP EXE 42274 3-29-87 9:55p
WATOR EXE 47222 3-29-87 3:17p
15 file(s) 341671 bytes
11264 bytes free