I couldn't help but notice that the JSB version of the 747 has a lift-ratio
which would make a sailplane pilot envious. One can glide about with full
flaps, gear out etc with AoA at 30--40° in 80 kias and keep it level. ;)
When running it with --debug-level=debug I get some numbers on JSB's
I couldn't help but notice that the JSB version of the 747 has a lift-ratio
which would make a sailplane pilot envious. One can glide about with full
flaps, gear out etc with AoA at 30--40° in 80 kias and keep it level. ;)
I've filed the bug as:
Log some output parameters. That can be done using the OUTPUT section of the
config file.
See the X-15 (?) or C-172x config file. I'll get around to it as soon as I can.
I'm _sure_
there's a simple explanation for this.
Jon
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL
I've been testing other jsbsim models tonight apart from the 747-100: 737,
c150, c182 and they all seem to have extremly low or zero drag. They won't
stall.
Hmmm. I've not heard any complaints about the other aircraft. The 737 has been
extensively
tested by someone who knows how they fly.
I've just tried out the c310 @KSFO, current metar conditions.
The Yasim one develops 38PSI of manifold pressure, ~2700RPM
at props and throttle full forward on the ground, brakes applied.
The JSBsim gives a (more realistic-?) 29PSI. No surprise the ground
roll at the Yasim one's is much
I've installed a new video card (eVGA 6800, 128mb) in my Windows 2K box.
Unfortunately,
now OpenGL apps give an application error - they don't even start up. I'm
trying to get
some answers out of the card and driver manufacturer, but if anyone here has any
suggestions, I'd appreciate hearing
I've installed a new video card (eVGA 6800, 128mb) in my Windows 2K box.
Unfortunately,
now OpenGL apps give an application error - they don't even start up. I'm
trying to get
some answers out of the card and driver manufacturer, but if anyone here has any
suggestions, I'd appreciate hearing
That was my understanding of it, but it seemed to not work with ___'s
Connie model. Upon further review it looks like ___'s Connie model has
an x-offset of about 14 meters, and I can't figure out why. So, I'll drop my
investigation of it.
Dave
:-)
Once we get the new JSBSim FDM
I noticed in the JSBSim file (c310.xml) definitions for pilot, copilot,
rear passengers and baggage. It all seems to be in the main cabin (i.e. no
baggage in the nose compartment). To lighten the load I'm going to remove
the rear pax. Will this automagically bring the CofG forward, or do I
Is there some kind of problem going on with downloading PLIB from CVS? Seems
there's been
a partial outage in progress on SF.net for weeks. I can't get plib from CVS,
though ...
:-(
Jon
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One thing that may be confusing is that the VRP setting given by aeromatic is
wrong. In the JSBSim configuration file If the CG location is X, Y, Z,
then the VRP location is -X, -Y, -Z.I had thought that AC_VRP defines the
location of the VRP, however it actually defines the location of
I wonder what compiler was JSB using in his string throwing example,
can you please re-read that thread and see if you can find an alternative
explanation?
Vassilii
I use Borland C++, and the g++ compiler in the cygwin distribution. I also
compile under a
flavor of Linux, just to see what
Szabolcs Berecz writes:
Could you direct me to some good online documentation about ATC and
aerodynamics of a helicopter?
Okay, I said I was going to email them privately, but then I looked at
a 32MB email in my outbound queue and realized that that was beyond
bad form.
See:
The Constellation looks pretty nice, but has a significant drawback:
The author has forgotten to implement the offset between FDM center and
visual reference point. This means the aircraft rotates around it's
nose which makes it almost impossible to accurately rotate for liftoff.
Furtheron it
As has been mentioned, JSBSim has been undergoing major improvements over the
past year
(see the newsletters) centering on added capabilities and improved XML
well-formed-ness.
The majority of those improvements have been completed and tested, both in a
standalone,
scripted mode, and in the
Syd, I presume this is your work. Would you mind adding this offset ?
Thanks,
Martin.
I *think* I know who did this model. I'll notify/ask him abou tit. Thanks for
noticing the
VRP aspect.
Jon
Hi guys no that one isn't mine.
As they say: The issue is being worked.
A nice shot of a carrier landing:
http://www.airliners.net/open.file/961401/M/
Jon
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And if none of this is possible, then I'm afraid I don't have a
TODO list and this will be the most boring release cycle ever.
m.
Heh. Maybe. Maybe not. I hope that from your point of view it turns out to be a
boring
release cycle. In one respect, it should not be very noticeable to users
I'm now working on the unsafe throws/catches in the
SimGear/FlightGear/Atlas/fgrun codebase.
A hefty amount of things to change is in the scope of the JSBsim code.
What should I do --- ignore them and hope for JSB doing a correct cleanup
upstream, or patch these as well?
Vassilii
If you
I agree with Franz Melchior.
And my question is, why it is so essential to call the next version release
1.0?
What's wrong with version numbers like 0.9.10, 0.9.11, 0.9.12 etc. until the
above issues are fixed?
That's what's been getting done for years. The question now is, why not? Curt's
Vassilii Khachaturov wrote:
I am unsure it is OK to through a temporary object like this.
It's created on the stack right there at the same frame where it's thrown,
but IIRC, as throw unwinds the stack, it is auto-destructed. You should
be throwing an object that has lifetime encompassing
I've been trying to use exception handling in a particularly appropriate place
in JSBSim,
but am having little success, and it's got me confused.
I have a section where I am reading in some data. If it is inappropriate, I
need to let
the user know and exit.
Here's what I'm doing:
In the Table
Hi,
attached are two small patches for giving the 737 nosewheel some
animations. Namely it rotates when steering and compresses on breaking.
For the latter I attached a one line patch that let's JSBsim expose
compression-norm to the property tree just like YaSim.
I don't know if this is in
Curt wrote:
The nasal script is specific code to impliment a specific aircraft's
electrical system, but the overall structure could be copied and adapted
to new aircraft. But each aircraft will need it's own aircraft specific
script.
I'll add that there are probably several ways to do
The version of FlightGear used for the MIADC show in May contains a
fan/turbine model based on physics and thermo equations, a different
approach to tank/engine selection to handle the 747 fuel system, changes
in the control packet, and an update to the data packets. It might not
be
Out of interest, did Mathias ever manage to fix the gear jitter at stationary
with his fancy integration scheme, and if so will it be going into FlightGear
when you merge up next?
Cheers - Dave
No. (I hope this doesn't open up a can of worms ...)
Though it is acknowledged that Mathias' fix
John Wojnaroski wrote:
It's generic, but needs some massaging to handle things like
compressor/turbine maps, engine parameters such as inlet area, fan size.
Point in fact, the model is based on John Reed's paper for LeRC, but the
actual numbers are my best guess to obtain some reasonable
I'll likely be relatively sparse on the Internet for the next week or so -
perhaps much,
much longer depending on how things go in League City, due to Rita. I'm about
14 feet
above sea level, about a mile inland from Galveston Bay.
Anyone else look like they're going to be affected by this?
To everyone who has helped, thanks. My goal is to model the behaviors
and capabilities of the Digitrak with as much accuracy is possible
given my ability and the limitations of Flight Gear. I doubt it would
be possible or desirable to model the electrical characteristics of
the sensors or
I'm not surprised it breaks with malformed XML files.
A suggested fix is below.
if (!input.good()) {
sg_io_exception ex(Problem reading file,
sg_location(path,
XML_GetCurrentLineNumber(parser),
This is off topic for FlightGear specifically, but I also am the Editor and a
writer for
another newsletter in addition to the JSBSim newsletter. The July/August issue
was just
posted. I thought you might be interested to read the newsletter for the
Houston chapter
of the American Institute of
I'd give a lot to know what these two papers are presenting! See below:
Jon
---
[EMAIL PROTECTED] Conference
26 - 29 Sep 2005
Hyatt Regency Crystal City
Arlington, Virginia
Session 71 COTS Software in Mission Critical Systems
0930
AIAA-2005-7108
Open Source Software: Cheap Isn't Exactly
We used red and green in Europe :-(
Erik
Did you look at it, anyhow? The blue and green channels both are set for the
right eye.
Red/Green glasses should work, too.
Jon
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I have, and would love to see it added to the FG collection - it appears to be
a thoroughly thought-out model. However, it's just too much trouble for me
to keep a third copy of FG for the sake of one model.
What is the general opinion of the modifications done to the FG source in
I had a look with a red / green pair and it's quite an impressive effect. I'd
love to have a go at making a true stereo HMD (dual display) because the
immersion effect 'feels' great.
The cockpit itself is stunning; top marks to its creators.
Just one point on the anaglyph; the difference in
. JSBSim can also be run by itself in a
standalone
mode.
The major new features in v0.9.9 can be seen in the latest issue of the JSBSim
newsletter,
Back of the Envelope (also just released). The newsletter can be viewed at
the project
web site at www.jsbsim.org.
Jon Berndt
JSBSim v0.9.9 has been released and is available at www.jsbsim.org. JSBSim is
an open
source flight dynamics model written in C++. JSBSim is one of the flight
models used in
the open source flight simulator, FlightGear, but JSBSim is also used in
other flight
simulator projects around
Those of you who have read the newsletter have probably seen (and drooled over)
the
wonderful 3D model of the L410 Turbolet created by Jiri and Jiri Javurek. Jiri
created a
left and right view of the cockpit, and I created a stereo anaglyph using the
images. If
you have red/blue glasses, you
But, an FDM interface needs to do more than shove a datastructure back
and forth. There needs to be some higher level communication to tell
the remote FDM when it should reset it self or when it should trim for
in air or on the ground, and what trim conditions are requested (i.e.
start in
Jon Berndt wrote:
I've tried these both. This seems to be fatal no matter what I do:
[EMAIL PROTECTED]:~/JSBSim$ ./configure
configure: error: cannot run /bin/sh ./config.sub
There are two things: Is is a symbolic link (and does the target exist)
and is it marked executable?
Erik
I
When the JSB a/c model has several engine+propeller we get
that JSB message error:
Failed to tie property propulsion/c-thrust[0] to a pointer
What must be defined in Aircraft.xml to solve it.
--
Gerard
Which version of JSBSim are you using? Is it the one currently in FlightGear
CVS?
I'm trying to build JSBSim on one of Sourceforge's compile farm boxes, this one
running
Linux. After running aclocal;automake;autoconf I try to run configure and get
this:
configure: error: cannot run /bin/sh ./config.sub
I don't see a config.sub. Where does that come from?
Jon
Since the MB-339 PAN is an on-going project, we plan to release
an improved version of the aircraft (with smokes?). If anyone
at flightgear.org would like to link our MB-339 PAN project in
the Related Projects section, we would be very happy.
Bye, Augusto.
I will mention it in the
FGLGear.cpp line 507
Here's the code:
// Crash detection logic (really out-of-bounds detection)
if (compressLength 500.0 ||
vForce.Magnitude() 1.0 ||
vMoment.Magnitude() 50.0 ||
SinkRate 1.4666*30)
{
PutMessage(Crash
Well, without the benefit of SimGear as a whole, I've crafted a [probably
non-optimal]
property tree cataloging function for use in JSBSim. Thought you might like to
see it:
//%%
struct PropertyCatalogStructure {
No, you can't format (the f in printf) the string using the default C++
string class).
You have to use the I/O manipulators (Stroustrup: 21.4.6.2, page 633ff.)
like std::setprecision().
The string class cannot create a string representation of a floating point
number as far
as I can tell.
In props.cxx I find this code:
/**
* Get a child node by position (*NOT* index).
*/
SGPropertyNode * getChild (int position);
Can anyone differentiate for me the concept of position as contrasted to
index in this
situation?
Jon
___
I don't know if there are others that use fgfs from front range
locations in Colorado, but I use it to practice instrument approaches in
this my home area and my two favorite aircraft for this are the c172p
and c310, both jsbsim models. _The yasim aircraft still work fine with
this
IIRC, sprintf was a problem for some. Is that still the case? I've compiled
under Cygwin,
Borland C++, and I think I've also compiled code that uses sprintf under IRIX.
Jon
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All the 3350s had this turbo/super setup. You can see it in some of
these images:
http://www.enginehistory.org/GjJBrossett/RAFCosford/Wright%20Cyclone%20R-3350%20cutaway.J
PG
http://www.enginehistory.org/GjJBrossett/RAFCosford/Wright%20Cyclone%20R-3350%20cutaway%2
0view.JPG
But that's not the only way to do it. I've been preparing a series of
articles on supercharging reciprocating engines. Is there any
interest for me to pull some of it out and present it here?
--
Pete Stickney
Hmm. This might be interesting for the next issue of the JSBSim newsletter,
Hi, folks,
I'm trying to build a Katana model (the flight model, at least) so I don't
have to perpetually terrorize the airfield's neighbors and my CFI while I
practice touch go's. I went through the Aero-Matic and came out with a
starting set of files, which I've been combing through and
With the potential of exposing my C++ knowledge deficiency, I'll explain how
far I got ;-)
As mentioned in the last post, I have two variables I can access through the
existing code I have.
One variable is cur_fdm_state which is of type FGInterface. FGInterface is a
parent class of JSBSim so
Can anyone suggest a way of accessing the methods:
GetCoefficientValues(...) and
GetCoefficientStrings(...)
from a --native socket?
I have a piece of code within flightgear which uses 'globals' and
'cur_fdm_state' via a socket similar to the --native socket
provided with flightgear.
I'd
I've noticed two things about easyXML.cxx.
1)
There is a function or macro called sg_io_exception(). This exception gets
thrown in my
development version due to an as-yet unidentified problem with readXML().
However, the
message that emanates from FlightGear is simply:
FlightGear aborting
I've noticed two things about easyXML.cxx.
1)
There is a function or macro called sg_io_exception(). This exception gets
thrown in my
development version due to an as-yet unidentified problem with readXML().
However, the
message that emanates from FlightGear is simply:
FlightGear aborting
I've noticed two things about easyXML.cxx.
1)
There is a function or macro called sg_io_exception(). This exception gets
thrown in my
development version due to an as-yet unidentified problem with readXML().
However, the
message that emanates from FlightGear is simply:
FlightGear aborting
test
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Here's an update to what I've discovered - hopefully someone can give me a hint
on some
questions I have.
First, I've added some output statements in easyxml.cxx, in this version of the
readXML()
function:
---
-- start --
---
void
readXML (istream
void
readXML (istream input, XMLVisitor visitor, const string path)
{
XML_Parser parser = XML_ParserCreate(0);
...
XML_ParserFree(parser);
cout A-3 endl;
throw sg_io_exception(Problem reading file,
sg_location(path,
void
readXML (istream input, XMLVisitor visitor, const string path)
{
engine_filename = FindEngineFullPathname(engine_filename);
readXML(engine_filename, *engine_file_parser);
The parameters don't match up for one thing. engine_filename is a string?
Dave
Sorry - there's
I'm continuing to install the new JSBSim code. I've run into a strange problem.
After I
start up FlightGear and begin to parse an aircraft, I'll be humming along just
fine until
I get to the point where the engine file is specified. When the engine file is
specified,
it causes the file to be
As far as I know, none. This is the first time I heard of this behavior
?!??
Erik
It's frustrating as hell. I don't see that I am doing much different from the
Makefile.am
from the previous build.
Jon
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I'm continuing to install the new JSBSim code. I've run into a strange
problem. After I
start up FlightGear and begin to parse an aircraft, I'll be humming along
just fine
until
I get to the point where the engine file is specified. When the engine file is
specified,
it causes the file to
Erik: Are you calling readXML while another call to readXML is in progress?
Norman: Can't be done unless this other call is in a different thread :-)
Jon:
I'm doing it in standalone JSBSim (calling readXML from within another
readXML()). I
thought you simply had to provide new arguments.
Obviously, this doesn't seem optimal. I'm not sure how I could possibly
arrange the files so there is only a single link reference to each library.
Yet, I don't know how I should modify the Makefile.am to produce a multiplely-
referenced library - or even if that is possible.
Jon
I wonder
I've placed an early copy of the new JSBSim config file format documentation
online. It's
incomplete, but I thought it was better to get something out there than wait
until it's
all done.
You can find it here:
http://www.jsbsim.org/Overview.pdf
Comments welcome.
Jon
You can find it here:
http://www.jsbsim.org/Overview.pdf
Comments welcome.
Note, however, that rate_groups are not yet implemented for the flight
control system.
Jon
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I'm working on getting the new JSBSim code into FlightGear. It's going pretty
well,
actually, but I still have one problem. I can't seem to get JSBSim.cxx to
compile in the
JSBSim directory. It wants to use JSBSim.cpp - which isn't there. My new
Makefile.am looks
like this:
--- start ---
I've got the basic build procedure figured out (I think) with the new JSBSim
code in
FlightGear. However, once it gets to the Big Link, it ultimately fails. Here's
the link
line:
--- start ---
g++ -DPKGLIBDIR=\/usr/local/share/FlightGear\ -g -O2 -D_REENTRANT
-L/usr/local/lib -o fgfs.exe
That all looks very good. Does your implementation of the Boost Control just
control the pressure, or does it act on the throttle as I understand was the
way it worked in the Merlin? In simulation terms the outcome is probably the
same.
V.
Hi, Vivian:
That would be a question for Dave
Beware instrument failure !
C172r and others aircraft have a turn coordinator out of order :=(
seems to be property:
/instrumentation/turn-indicator/indicated-turn-rate
I noticed that. I wonder when that happened?
Jon
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Thanks,
My question could be a question to Jon, Dave, and any JSB specialist.
I just wonder, about, the opportunity to get profit of your work for
developments on the JSB branch. The properties should be the same on
the global FG level.
Both FDM -YASim -JSBSim with a different
[EMAIL PROTECTED] wrote:
I typed make and I got the following error:
FGNozzle.cpp: In method 'JSBSim::FGNozzle(JSBSim::FGFDMExec *,
JSBSim::FGConfigFile *, int =0)':
FGNozzle.cpp:74: implicit declaration of function 'int
JSBSim::snprintf(..)'
Does someone knows what is
I used this command line:
fgfs [EMAIL PROTECTED] --aircraft=c172r --turbulence=0.0
This set up the winds as I wanted. However, even though turbulence was set
to zero,
there was still lots of noise present in the wind velocity coming from
FlightGear. The
wind seemed to vary +/- 5 to 10
Is anyone aware of a [simple?] way to print out the property tree once it has
been
populated? It seems to me that there ought to be a class attribute in the
property manager
somewhere that is a pointer to a linked list, or a vector, or whatever, that
contains the
properties, each of which may
This short reference:
http://www.flightgear.org/Docs/FGShortRef.pdf
shows the rudder control on the numeric keypad as being the 0 and , (comma)
keys. There
is no comma on the numeric keypad. This is confusing.
Jon
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I am testing out a small preliminary fix for the landing gear jitter seen in
various
JSBSim aircraft. Curt has relayed that the default C-172 does have this problem
- and I
have now seen that. The preliminary fix does seem to have fixed that, although
when brakes
are applied while at rest there
What does FlightGear do in the way of wind and turbulence? I assume that winds
are set in
FlightGear in NED coordinates and that those change slowly? Turbulence is
modeled in the
FDMs, but parameters are passed in? FlightGear does not model turbulence
itself, does it?
What is WEATHER_CM?
I am debugging the gear jittering in JSBSim and I am seeing
windNED spike every so often and I have commented out turbulence
code in JSBSim, so I am wondering if these wind spikes are
coming from FlightGear.
OK, in working to fix the gear jitter I've discovered some things about the
winds
WeatherCM is the old weather system that has been removed from
cvs for fgfs 0.9.4. It's in the old repository's hidden Attic/. I
think it's safe to remove all traces to it.
m.
Thanks. Will do. That simplifies looking at the code.
Jon
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So there's nothing wrong with it, it's just that every user has another kind
of keyboard layout. ;)
Best Regards,
Oliver C.
Aha! Well, yes, I understand, now, but for newbies from the U.S. it will be
wrong. I'll
modify the PDF and send it to Curt (or whoever maintains that doc). It needs
Modify the PDF? Of course, you mean the TeX source file from which it was
generated, not the PDF itself, right? It's in the docs module.
m.
I already modified the PDF (I have Acrobat). I didn't know where the doc came
from
originally, and I don't know TeX.
If I have time later I'll take a
Aha ? In fact the notation in the cheat sheet _is_ correct and clear,
why the hell do you want to break it ? It's just a matter of point of
view an I assume there are _many_ FlightGear users out there that have
a comma as a decimal separator - it's just that they probably don't
live in the
I have been trying to make the JSB flight model for my PA-25 pawnee for over
a week now, however, I can not get it to steer on the ground. Every time I
start my take off roll the plane goes in circles.
Has anybody encountered any similar problems?
I am working on trying to resolve the
So, you think the UK is part of Europe, eh? We use the same convention as
the US for ./,
Vivian.
Heh. :-) What's above the number 4 (not on the numeric keypad)? Is it a $
or a ?
(not sure that will print correctly)?
Jon
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This complies entirely with my intention. Please excuse me for missing
the point - from reading your comment I had the impression you simply
changed the comma to a dot in the PDF. Please send me a copy of your
PDF and I'll change the TeX source accordingly.
Thanks - will do.
I'm currently
bass pumped
3. I send 0s for all the other properties that I do not want to
control. I realize now that it was a bad idea... the aircraft sits
frozen (none of the usual JSBsim vibration either) on the runway.
Can you give me a good example case of where an aircraft is sitting on the
Can you give me a good example case of where an aircraft is sitting on the
runway and
jittering a lot? I know that problem existed at one point with the C-172,
but
it does not
seem to happen for me now. I have a possible fix I wanted to try out, so I
need a good
example.
The
It's taking about 3 minutes to initialize FGFS under CygWin. I seem to recall a
conversation about that a few weeks ago. Is that something that is being
worked, or can it
be resolved? Is there something I can do to my setup?
Jon
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..speaking of which; Are those Big-Overhaul-So-Lay-Off-cvs jobs
done in the FG and JSBSim cvs trees?
Sorry. Yes. I thought I made a small announcement that I had gotten that taken
care of.
Maybe not.
Jon
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I have placed a compiled tarball of yesterdays OpenAL CVS files @
http://www.vso.cape.com/~nhv/files/cygwin/cyg_openAL.tgz
you might want to test these against the current FGFS before
blindly overwriting your currrent installation
Is this distribution modified for use with CygWin as
I was looking at the gear jitter in the latest version of FlightGear with the
current C172
(JSBSim). I didn't notice much jitter at all - really very little. Is that
because winds
are off by default, now? Is there a particular setup where I can see it most
noticeably? I
have a possible fix that
It appears as though JSBSim CVS is in a good state, with the new code, and new
directory
structure.
Notes:
1) No attempt has yet been made to test this with FlightGear - that will take a
little bit
of work. Things are different: the directory structure, the code, the aircraft
config
files,
Hmmm ... we had to fiddle with it to make it work some months ago ... I
forget exactly what we did
This seems really unfortunate for FlightGear - that we have to rely on another
package
where some of us have to fix the code to work for CygWin users. Is this even
documented
anywhere?
jon
In the developers' list archives is the best we have. Cygwin wouldn't work
at all if it were not for the excellent work by Norman Vine. There's no sign
of OpenAL being ported to Cygwin at the moment, so this is the best we have.
We are in constant danger of being left behind.
Have you got it
Is anyone aware of which C library calls for determining time (down to the
millisecond) -
either elapsed or calendar - are best used under all the platforms that
FlightGear runs
on?
Jon
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Jon Berndt wrote:
I'm finally getting around to reinstalling FlightGear after a hard drive
crash a couple months ago. I have this as a place to get OpenAL for Cygwin:
Try this version:
ftp://ftp.ihg.uni-duisburg.de/FlightGear/Win32/openal_cyg.tgz
Vivian
I got that file. I untarred
There is a plib api for accurate timing. You may not want a plib
dependency in jsbsim, but you could take a look at which functions they
use on which platforms.
Curt.
Thanks. I'll take a look. I've got something that seems to work well enough at
the moment,
but at some point I'd like to
Well, I had been working on a B717... the flightmodel seemed ok, but
hasn't been updated to the newer JSBSim config file formats, so it will
need some work in that area.
I'll be posting a converter that takes old format files into the new format -
not the
engines or thrusters, but those are
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