Has anyone flown the C310 (JSBSim) and found the flaps to be too
ineffective? I'm looking at the lift increment due to flaps. They seem to be
too low by quite a bit. I'm wondering if anyone has notived that in flight.
Jon
---
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In anycase, this new method cuts down the work by half. I also
think that SVG
is an excellent format to work with. So, I will continue my
experiment using this format.
SVG is nice. I'm going to be using it with XSLT to display JSBSim config
file tables - I hope.
Jon
) on the
JSBSim web site, www.jsbsim.org.
Jon
--
Jon S. Berndt
Development Coordinator
JSBSim Project
www.JSBSim.org
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After noticing that the animation for the rudder, the elevator, the
ailerons and the flaps are not working anymore, I dig into the code to
find out that FlightGear expect normalized properties from JSBsim ( see
FGJSBsim::copy_from_JSBsim ).
This was discussed at length in the JSBSim developer
I've packaged up the latest JSBSim code into 0.9.10 (Pre-v1.0). It is
available in the Files section of www.sf.net/projects/jsbsim.
There are executables built for several versions of Linux: i386, PPC, AMD64.
There is a Win32 executable. Simplot is available there for Win32. The
source archive is
I am also interested in the modelling of jet engine. I've been
looking into the problem for quite some time and have darkened
many pages of equations in order to find a model that could meet
my expectations.
What I would like to achieve would be the following
- Engine stall and surge
this capability could be added without much code overhead at all,
and would make JSBSim much more robust in the hands of new users.
Comments?
Jon
Jon S. Berndt
Development Coordinator
JSBSim Project
www.JSBSim.org
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However, a validator with some knowledge of the expected content
of tags and
possibly values would be very nice indeed and could save quite a
bit of time
hunting around for the source of errors.
I've created a schema for the JSBSim aircraft configuration file. The
XMLStarlet utility, xml,
Maybe
they've made improvements, so our code won't need the "hacks" so much ...
?
-Original Message-From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]On Behalf Of Vance
SoudersSent: Monday, January 23, 2006 8:05 AMTo:
'flightgear-devel@lists.sourceforge.net'Subject:
Hi,
the new JSBSim code crashes when referring to an undefined
property in the function element.
Example:
function NAME=foo
description
This one will crash fg
/description
product
propertyaero/function/bar/property
This is no proplem when you have a working config file, but is no
fun while developing a new model :-(
I think a message like
function name=xyz referring to undefined property aero/function/bar
and a more or less graceful shutdown of fg should be more developer
friendly ;-)
OK,
Hi,
the new JSBSim code crashes when referring to an undefined
property in the function element.
Example:
function NAME=foo
description
This one will crash fg
/description
product
propertyaero/function/bar/property
Great!
And thanks to the little devil, that woke you up to solve my problem :-)
:-)
I just committed a fix to JSBSim cvs, to file FGFunction,cpp. Here is a
snippet that contains the new code:
--- start ---
while (element) {
operation = element-GetName();
// data types
if
It is and it works. But the nightmare continues...
the same happens when using undefined property in the
independentVar tag...
Ain't there some noise in your kids room?
:-)
Did you turn on the logging messages like I mentioned in my other mail?
JSBSim does output these messages, but
It is and it works. But the nightmare continues...
the same happens when using undefined property in the
independentVar tag...
Ain't there some noise in your kids room?
:-)
Did you turn on the logging messages like I mentioned in my other mail?
JSBSim does output these messages, but
How does the flight model feel when you kill an engine? I remember a
couple of years ago that we weren't getting nearly enough drag from a
windmilling propeller, either in JSBSim or in YASim, but I don't know
how the code is now.
David
It should be much better in JSBSim, now. Thanks to
I'm writing an article for an upcoming AIAA Houston newsletter about the
great free software titles out there today - particularly those relating to
science/engineering, software development, and office/productivity. Any
suggestions (particularly in the area of aeronautical engineering, and
smime.p7m
Description: S/MIME encrypted message
Chris Metzler wrote:
Sorry, I'm feeling really slow (probably because it's late where I am,
and
I should go to sleep). There was a change in JSBSim configuration file
format in going to JSBSim 2.0; that has caused a lot of aircraft that
haven't yet been updated to not run under FG 0.9.9, and
Chris wrote:
To what little I understand, I agree completely that changes were
good. But from the FlightGear perspective, one could have imagined
different ways of dealing with old-style config files. For example, one
could have imagined a parser which detected the config file style, and
Erik wrote:
FlightGear should always display messages when it is labeled alert.
Maybe there is a log-level mismatch between FlightGear and JSBSim?
Here's the controlling code in JSBSim.cxx:
switch (logbuf::get_log_priority()) {
case SG_BULK:
FGJSBBase::debug_lvl =
Has anyone seen this when trying to run make install on plib?
Making install in sg
make[2]: Entering directory `/cygdrive/d/jon/src/plib/src/sg'
make[2]: *** No rule to make target `install'. Stop.
make[2]: Leaving directory `/cygdrive/d/jon/src/plib/src/sg'
make[1]: *** [install-recursive]
Version of both FG source and data -- CVS, current as to six hours ago.
Ditto for SG. plib I haven't updated in a week.
OK, I updated by plib/simgear/flightgear/base installation as of this
morning. The Concorde and Boeing 314 are both made of the old config file
format. The newest code
AFter a fresh plib/simgear/flightgear build, I got a successful plib and
simgear build, but got tripped up in FlightGear due to a problem with
SimGear as follows:
=== start ===
g++ -g -O2 -D_REENTRANT -L/usr/local/lib -o test-text.exe test-text.o
if
g++ -DHAVE_CONFIG_H -I. -I.
AFter a fresh plib/simgear/flightgear build, I got a successful plib and
simgear build, but got tripped up in FlightGear due to a problem with
SimGear as follows:
Stupid me. I worded the problem incorrectly. Obviously, the problem is with
a compile of the FlightGear test program, with the
I to had this problem with a FDM that Dave Culp sent me for the new 737.
Here is what occured.
...
I have from my start of using FG used wordpad under windows 98se
to do all my XML
files without problem.Could there be something in the new XML
format that my worpad
does not handle leading
Opening it in a browser shows no errors and the file opens correctly.
It seems strange that just commenting out a section of the file and then
uncommenting it again would cause FG to abort.I have changed
the old JSBSIM file without any problem.
I only commented on this because some one else
One thing to watch out for is that JSBSim can choke on TABs in certain parts
of the config file for some reason. It seems perfectly happy with them in
some places (as indeed it ought to be), but if they exist in other parts, it
crashes.
If this problem is not a priority for fixing,
Here's the offensive code in /usr/local/include/simgear/math/SGMisc.hxx
=== start ===
static T min(const T a, const T b)
=== end ===
The last line, above, is the culprit. As before, the errors are:
SGMisc.hxx:28: error: expected unqualified-id before const
SGMisc.hxx:28:
Melchior FRANZ wrote:
I suggest we put that in every single file in sg and fg, with an
#ifdef around, just like those sophisticated #include config.h.
That way the likeliness of omissions and typos is vastly reduced. :-}
m.
At the suggestion of an email, I seem to be getting much farther
At the suggestion of an email, I seem to be getting much farther
by putting this:
My build was successful.
Jon
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Has anyone ever checked to see how many lines of code are involved in
plib/simgear/flightgear?
Jon
This:
wc `find . -name *.[ch]??;find . -name *.[ch]`
results in a finding that there are 420,000+ lines in the source and header
files. That's not lines-of-code, but just lines.
Jon
It's not all that useful a metric -- I'd prefer to count methods,
functions, etc. -- but FlightGear checks in at roughly 215,000 lines
of C/C++ code, and SimGear checks in at close to 75,000 lines.
Why stop there, though? The base package contains about 95,000 (!!!)
lines of XML and nearly
Another metric: there are ~1500 files
in the plib/simgear/flightgear codebase.
Jon
Here's a clarification (before I get called on this), there are ~1500 .c,
.h, .cpp, .cxx, and .hxx files.
Jon
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I found a spot where I can put a tab and make it fail. I'll work
on that. I think I also must still hav eyour file - thanks for
reminding me.
Jon
I've committed a fix to JSBSim CVS for the situation where tabs or spaces
appear in element data - for instance, in tables. Tabs and/or spaces
and have completed an initial
cut at that. Have not tested it, yet. It's all in JSBSim CVS if you are
interested.
Jon
Jon S. Berndt
Development Coordinator
JSBSim Project
www.JSBSim.org
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The code for JSBSim is in the tar file from MIADC or Scale. It is
not part of the CVS tree or 0.9.9, source is avaialble but not my call to put
it in.JW
John:
Which JSBSim files are changed for the propulsion mods you
made?
Jon
I also noticed that none of the electrical systems can be switched off
either. I am trying to add as much realism i.e. switches etc to this as
possible.
Justin Smithies
I think the fuel would flow to the engines anyway due to gravity.
Ampere
Remember dihedral. Are the tanks
This is not a FlightGear related problem, especially. It might actually be a
solid Direct3D / Windows problem. But, I'm hoping someone here has seen
something similar.
I was trying to fly MS Combat FS the other day. When the thing initialized I
noticed that some of the terrain areas had not been
FlightGear seems to have no problems. I also don't see any
obvious problems elsewhere.
Hey, you might as well just stick with what works ... :-)
:-)
Curt.
Heh. I expected someone to say that!
Actually I consider it more of a video card / driver problem. Very
frustrating. :-(
Jon
Before we go stuffing around it might be good if we find out how the real
737 fuel delivery system works(it ain't a cessna).As it stands now if you
activate the fuel cutoff the engine should shtdown and that pretty much
is how the real aircraft works.
Cheers
Innis
True. It would also
I've applied this patch to both the c172r and c172p in JSBSim CVS. Thanks,
Jon
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of
Jean-Yves Lefort
Sent: Sunday, March 05, 2006 3:26 PM
To: flightgear-devel@lists.sourceforge.net
Subject:
I've updated the FAQ for JSBSim considerably. You can get there by visiting
the JSBSim web site and clicking at the FAQ link at the top of the page, or
by going directly here:
http://www.jsbsim.org/FAQ.html
I've also added a listing of all articles in the JSBSim newsletter on the
documents page.
I agree with Melchoir on this point, and, in fact, I have an unbiased
reference point. I took my 13-year-old daughter and her friend for a
one-hour flight yesterday in beautiful, sunny late-winter weather.
While we were taxiing at 1000 rpm, the propeller was -- just barely --
visible as a
I just updated from FlightGear CVS and tried to build. Got this:
make[2]: Entering directory `/cygdrive/d/jon/src/flightgear/source/src/GUI'
if
++ -DHAVE_CONFIG_H -I. -I. -I../../src/Include -I../.. -I../../src -I/usr/l
ocal/include -D_REENTRANT -MT dialog.o -MD -MP -MF .deps/dialog.Tpo -c -o
I have a large JSBSim aircraft defintion file that was not parsing.
I discovered that easyxml has a size limit of 16K. Any xml tag must
complete in 16384 bytes:
Did you confirm the location of the problem with gdb? Was there
actually a crash here?
The input buffer size shouldn't
make sure you updated your base package with -d option, like in :
cvs -z4 up -d -P -A $FG_ROOT
That fixed the problem. I've got a running FGFS, now. Although, when I quit
the application, I got this:
OpenAL error (AL_ILLEGAL_COMMAND): stop (alDeleteSources)
OpenAL error (AL_ILLEGAL_COMMAND):
The default C172 in FlightGear seems to be a bit overpowered. It climbs
nicely, and at level flight at about 1,000 feet, I settle out at 140 kts and
2800 rpm with full throttle. Does that seem high?
Jon
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Markus - I've got your patch. I hope to take a look and implement this
shortly - might be a day or two. Email me if I forget.
Jon
Jon S. Berndt
Development Coordinator
JSBSim Project
www.JSBSim.org
if noticed that my engine doesn't shutdown if i'am out of
fuel. the attached patch fixes
Markus - I've got your patch. I hope to take a look and implement this
shortly - might be a day or two. Email me if I forget.
I've quite possibly missed something - but was pretty sure (and
others have
also confirmed) that this functionality is already present in JSBSim?
I didn't do
The patch has been incorporated into JSBSim and has been committed to JSBSim
CVS. Thanks, Markus.
Jon
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I noticed that the 737 model (the flight model definition file) differs from
the one in JSBSim CVS. Did someone edit the copy in FlightGear CVS? The
changes need to go to the source, else they risk being eventually lost. I'm
not sure which is more recent.
Jon
Are you talking about the data/Aircraft/737*/Models/*xml files?
I am not the one who changed them, but I must say, that, while I
was aware that the source/src/FDM/JSBSim subdirs are all coming
from the JSBSim CVS and should be updated there, the data/...
thing is new to me. Maybe you should
.
1 dimensional table with 2
rows. -0.3490
-0.0688 0.8730
-0.0115 Function: aero/coefficient/Cndr
JSBSim startup complete
Could not open initialization file:
src/../aircraft/src/../f15/src/../.xmlInitialization
unsuccessful
From: Jon S
While there could be bugs there, they shouldn't be related to line
ends. Expat (underneath EasyXML) will have normalized all of the line
ends before JSBSim ever sees the data.
David
I stepped through the code. It *appears* that the line endings were NOT
handled by expat. There could be
On 20/03/06, Phil Cazzola [EMAIL PROTECTED] wrote:
You're right. Sorry, I was looking at the version in the
JSBSim cvs.
No exceptions there.
If the JSBSim version simply removed the exception throws
without compensating with some other kind of mechanism, then
I can see how
If the JSBSim version simply removed the exception throws without
compensating with some other kind of mechanism, then I can see how
you'd run into a lot of problems. I don't have a copy of the JSBSim
code on my computer to check.
Having a quick look at
On 21/03/06, Jon S. Berndt [EMAIL PROTECTED] wrote:
The exception sg_io_throws are a result of a problem in parsing. I've
replaced those in our local copy of easyxml.cxx with error message
printouts (cerr ), thus reducing our dependence on specific external
exception classes
Regarding the parsing problem where tabs were present in the config file, I
believe I have fixed that - I had made a stupid error in the last changes.
The fix was tested with the lightning config file in JSBSim standalone
(where I had been able to reproduce the error).
Jon
* Buchanan, Stuart -- Thursday 23 March 2006 11:39:
I'm getting a core dump when running with Concorde on an up to date
SimGear/FG/Data on Cygwin.
There are apparently two reasons:
(a) the concorde doesn't work with jsbsim 2.0 yet, and aborts
(b) this crashes fgfs (but why?)
I've
* Melchior FRANZ -- Thursday 23 March 2006 12:42:
There are apparently two reasons:
(a) the concorde doesn't work with jsbsim 2.0 yet, and aborts
(b) this crashes fgfs (but why?)
One could assume that it's because FDM/JSBSim.[ch]xx uses a lot of
unguarded pointers to SGPropertyNode-s
Thanks. Does the same issue apply to the c310?
-Stuart
No - I've fixed that one too, I believe. During testing of the C310 in
JSBSim standalone mode, I had created an autopilot for that to fly between
waypoints. It's not completed, but the reference to it made its way into the
FlightGear C310
* Melchior FRANZ -- Thursday 23 March 2006 16:18:
It's just a question of time, though, until the same bug in
JSBSim bites us in the ass in the same way. Please fix. (see attachment)
Anything wrong with the patch? Nobody from JSBSim interested?
Should I commit?
m.
Go ahead. Have you
Any possiblity of collision detection in the near future ?
I.e. instead of the aircraft falling through the ground it
just stop dies explodes whatever.
Also would it be a big job to stop the aircraft going through
3d models as if they were ghosts ?
Cheers
Justin Smithies
JSBSim
* Stefan Seifert -- Monday 03 April 2006 21:49:
Melchior FRANZ wrote:
flying with Mach 1.00 at 250,000 ft,
a little higher, and you won't come back.
I reached ~310,000 ft, but an unexpected shortage of fuel forced me
down again (with Mach 1.5).
m.
This kind of sucks. I'll have to
The reason why I don't remember exactly is that I had tried the 737 a few
dozens of times with AP before that, because I was working on an improved
version of the autopilot.xml dialog.
m.
Is this a new problem? Did it occur with 0.9.9?
Jon
* Jon S. Berndt -- Tuesday 04 April 2006 01:40:
Any inputs on how to duplicate this problem quick and insight
into a cause
would be helpful.
I didn't start on ground, but with this command line (relevant
parts only):
$ fgfs --aircraft=737-300 --airport=KSNS --altitude=3 --heading
I notice a couple of things here:
1) According to the visuals (and the flight characteristics) the spoilers
are deployed when the sim starts up with these options you give, above.
BTW: what would cause spoilers to be deployed at startup?
Jon
Add this (which is in my $FG_HOME/preferences.xml):
--prop:/environment/params/control-fdm-atmosphere=1
and don't ask *me* what it is good for. ;-)
m.
I don't know what this does, but all bets are off (and there's nothing I can
do) unless you use the default JSBSim atmosphere model.
I remember: it's for injecting METAR temperature/pressure into the FDM.
No problems without that set. It's definitely a bug, but the question is
where? fgfs? JSBSim? Or some disagreement in between. Or does
it only work
when METAR is actually activated (which it wasn't)? Anyway: the vast
Using k/j or Ctrl-b or Shift-S - nothing seems to be able to stow the
speedbrake/spoilers on the upper surface of the 737-300 wing. Using the j
key seems to start it stowing, but it's only momentary. Then, it deploys
again. This happens when I use the --disable-real-weather-fetch on the
command
I cannot reproduce the spoiler problem. I tried using Melchior's command
line, with and without --disable-real-weather-fetch. I attached my
fgfsrc for completeness, but don't think it makes any difference. Of
course I'm on current CVS (plib, SimGear, FG, base data, 737-300).
Nine
While debugging the 737 I discovered something that I find unsettling. For
the 737-300 model (using a JSBSim flight model) there is a nasal script
called air-ground.nas. This apparently adds some automatic control of the
spoilers while on the ground. Now, understand up front that the discussion
I've done a search and found that the following aircraft flight models
currently have no valid (new) specification using JSBSim-ML v2.0:
707
B29
C150
C310u3a-jsbsim
colditz
Lockheed1049
I'll try to get to those soon, but don't know when that will be. If someone
else wants to convert them (and
I'm subsribed to all fgfs/sg cvslogs mailing lists, and update and
recompile *at least* once every day, often within minutes after a commit.
Except if the commits were mine, which isn't exactly rare either.
No, I won't update anything. I'm already running CVS/HEAD, just
like always.
(Of
Well, the B-29 doesn't really have any correct JSBSim config at all, so
you might as well just ignore that entry. I don't think I will ever get
the polar data for the Boeing wing, so it will probably not happen in
the future either.
Josh
I think we can wing it fairly accurately (pun
* Jon S. Berndt -- Wednesday 05 April 2006 15:21:
Now the question is, how up-to-date is your code? ;-)
About an hour ago. plib/simgear/flightgear/base.
Hehe ... OK. I just remember that you come occasionally with compilation
problems that are caused by code changes done several weeks
Thanks for the file. It fixed the seg fault.
But C172R seems to suffer the same lower-than-RL max RPM as C172P (2200
vs 2400), and as such cannot climb at the expected rate.
Do they share some engine spec file that may have been modifed recently?
Yavuz Onder
I don't think so. I've got a
Hi,
inspired by the XML Schema delivered with JSBSim, I started to
write on for YASim (and I have in mind to create one for the
other config files, too).
Bravo! I think this is a great idea.
First, for those who do not know what the hack is a XML schema
and what do I need it for?
FYI,
I think the point of Torsten ( the OP ) was that if we have a
XML schema,users are then free to use the tool they want.
Correct, I don't want to promote a specific tool. The reason to
name one was
to give those a hint who do not know where to start. You have the
freedom of choice.
Who needs screenshots where there are movies?! :P
http://pigeond.net/photos/flightgear/videos/
Ampere
These won't play on my WinXP box using Windows Media Player.
Jon
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Question 1 :
Is there any way to configure the EGT for a JSBSim engine?
The 737-300 uses a CFM56-3 engine and the stabilized idle EGT should be
approximately 475 degrees Celcius although it can be as high as
650 degrees
Celcius on a hot day in bleed configuration and if it's in a
If you want to see some really bad flying, check out this link (probably
requiring windows.)
http://media.putfile.com/wild-fun-fly
I'm trying to decide if they are blind, drunk, have no depth perception,
have their controls reversed either physically or metaphorically.
Curt.
Is it
Hi, Justin:
Yes, this should be possible, soon. I've added some capabilities that should
support this in code. Really, it will amount to thrust dumping, I think.
I've got a few other things in the queue ahead of this, though, including
the latest JSBSim newsletter (almost done - and nearly twice
Is there a better way to edit FG XML files than using a text editor?
Possibily something that helps with syntax and keywork selection?
Regards
:-D ene
There are several very good XML editors available. I use OxygenXML. If there
exists a schema for the XML file being edited, there are even
http://www.anft.net/f-14/f14-detail-dimensions.htm
in case you need some more info :-)
Excellent source.
Jon
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Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated
Anyone here know if the A-4 had a pitch SAS?
Dave
Dave:
It seems that in the pitch channel for the A-4 the pilot commands normal
acceleration. The Az error is computed, and that is differenced with pitch
rate. That error drives the elevator. See the A-4 section here:
.
Sam Heyman (University of Bristol) discusses his use of Matlab/Simulink and
FlightGear/JSBSim in developing control laws for the Manta UAV.
There are also articles on using Gnuplot with JSBSim, and a preview of a
coming paper on Aerodynamics using JSBSim.
... and lots more.
Enjoy!
Jon
Jon S
I just *know* I'm going to get totally flamed for this, but can someone
please tell me how the CG, Eyepoint, AERORP and VRP are interconnected?
Yeah, I know - RTFM.
I'd say that, but there really isn't much of one, yet! :-(
You won't get flamed. It's not the easiest concept to figure out.
I think the list has been down.
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Download IBM WebSphere Application Server v.1.0.1 based
Steve Hosgood wrote:
Before I say anything, I'd like to commend you Jon, along with Dave Culp
and Erik Hofman for your three replies to my original question. *None*
of you flamed me or anyone else, and answered pretty much all my
questions really neatly.
You're not subscribed to
I'm
working on a thorough document now, but I still only hav e alittle psare time in
which to write it. :-(
Jon
-Original Message-From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]On Behalf Of Steve
HosgoodSent: Friday, May 12, 2006 8:22 AMTo:
I'm putting together a presentation to give my fellow workers about
FlightGear and JSBSim. I'd like to feature the best screenshots of
landscapes, aircraft, sky scenes, structures, etc. that showcase
FlightGear's current capabilities.
Suggestions?
Jon
Does anyone have a good Lines of Code count for FlightGear 0.9.10?
Also, as I recall, there was a tool that allowed for an estimation of the
value of a set of code. Has that been run on Flightgear in its current
state? Anyone willing to estimate what the development cost would be of
FlightGear
Are there any videos (screen captures) of flightgear in action on the web
anywhere?
Jon
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Can anyone tell me what the file structure should look like for a MediaWiki
installation?
Say I've got a main html directory where all the public html pages go, and I
want to install a wiki in a subdirectory of that, wiki/. I think that is
where the LocalSettings.php and index.php files are
Here's just a little reminder that you might want to try the new (*very*
new, in fact) JSBSim Commander, which is in early beta stage, but is usable.
That might be helpful in editing your aircraft model. JSBSim Commander has
gotten a great start with a lot of hard work by Matthew Gong. See the
Well, SourceForge seems to have temporarily lost the ability to post to the
JSBSim mailing list, so, if I may, here's one that I'd like to publicize:
[Inspired by the new FlightGear Wiki] I have set up a Wiki for JSBSim. This
should help in creating a living, online, reference for JSBSim.
You
I have posted an initial (but still useful) article I am writing on the
process of creating a JSBSim aircraft model. You can read it here:
http://jsbsim.sourceforge.net/CreatingJSBSimAircraft.pdf
If you have any comments on what is unclear, or where more detail needs to
be added, please let me
Using derivations very similar to those described by Jon in his
latest paper, I have managed having my Su-26 alpha model do most
of these figures :
http://aerobatics.ws/acro_figures.html
The ones that still are a little dirty for me are the tailslide
and sided loops (the former because I
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