There has been some discussion of the F-16 working badly. I took another
look at it over lunch. I think I have found one bug (which is not to
say, the "only" bug). There are several integrators used in the control
laws. These should have wind-up protection set up (which they don't).
But, apart from
On Behalf Of dave perry
> Sent: Tuesday, December 04, 2007 1:13 PM
>
> While looking into the AP oscillation about the ILS near the
> runway for the SenecaII, I noticed that the sense is still
> accounted for twice (see
> Re: [Flightgear-devel] Bug in JSBSim FGPropeller.cpp,
> 08/07/2007) i
Actually, it might be closer to v5.0 by now.
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> Hi,
>
> I just observed something I don't know if it's a bug or a feature:
>
> Parking any JSBSim aircraft at KSFO and simulating global
> warming by setting the air-temperature to 45degC and dewpoint
> to 40degC and observing the properties
> /environment/density-slugft3
> and
> /fdm/jsbsim/
> Yes there is some differences needed to keep the right
> heading , when we modify the throttle value, but it is not
> exactly what you are describing.
I haven't been able to look too closely at this, yet, but I have a
suspicion. If you look in the function FGPropeller::GetPowerRequired()
ther
> There is a bug in JSBSim causing multiengine aircraft with
> counterrotating props suffer from excessive yaw when engines
> are running. Significant aileron deflection is required to
> fly straight and level.
>
> I tracked down that issue and finally came to FGPropeller.cpp
> line 198:
>
>
Title: Re: [Flightgear-devel] flight control polarity
On 07/03/2007 02:45 PM, Berndt, Jon S wrote:
> A positive elevator angular deflection (about the +Y
> axis) makes the trailing edge of the elevator move down, resulting in a
> negative pitching moment.
>
> Likewise, a posit
> -- Positive elevator deflection creates a positive pitching moment,
>positive around the +Y axis, i.e. nose up.
By the way, Cm_de (that is, pitching moment given an elevator
deflection) is nominally negative. So, you can see, a positive elevator
deflection results in a negative pitching mo
> In every aeronautical engineering publication I've seen, the
> convention for "positive" has been:
> -- Positive aileron deflection creates a positive rolling moment,
>positive around the +X axis, i.e. roll to the right;
> -- Positive rudder deflection creates a positive yawing moment,
>
See attached forwarded message. Someone is selling FlightGear
on ebay. This time there is no mention of our project name, they have
changed the name and are calling it "Pro Aircraft Flight Simulator". In
addition, they are using the same sleazy tactics of selling a digital
download, not
> Hello ,
>
> A transport aircraft model is under construction, by the next
> days a first alpha version will be available.
> That aircraft is the Nord 2502 here is the link on Wikipedia
> which gives a descriptions of the real ones
> french http://fr.wikipedia.org/wiki/Nord_2501
> english
> Short version:
>
> Here is the link to an updated patch which (a) corrects the
> VRP precisely as Anders did with the F80C while removing the
> somewhat incorrect Z offset in /Models and (b) adds several
> contact points. It does not change any other pre-existing
> gear, etc coordinates:
>
That should not be necessary. The aircraft configuration file only needs
to be consistent within itself. The structural frame is used for the
location of engines, landing gear, empty-weight CG, etc. There is also
a point called the visial reference point (typically the nose of the
aircraft) that i
> "gh.robin" wrote:
>
> > With FlightGear-0.9.11-pre1 it is something strange
> > we have Flying Carriers.
>
> The carrier is correct - sea level is wrong :-))
>
> Martin.
> P.S.: Just a joke
Ha! Actually, I'd expect someone from the Navy will be contacting the
FlightGear "man
> Hi,
>
> I'm trying to use FlightGear for some gliding/soaring
> simulation, and I've got a few questions...
>
> First, am I right that the AIthermal already written only
> works with JSBSim Flight Models, and that that conversely the
> turbulence model (used in the AIstorm), and the new winc
Title: FlightGear Presentation at Johnson Space Center
I'll be presenting FlightGear and JSBSim during the AIAA-Houston Annual Technical Symposium (ATS) at NASA Johnson Space Center on May 11. I already have a presentation about JSBSim, and some words on FlightGear, but I want to add more to
Title: FlightGear presentation
I'll be presenting an overview of FlightGear and JSBSim on Wednesday. I have some good screen shots, but if someone can point me towards some more good "eye candy" and movies of FlightGear in action, that would be appreciated. Note that requested screen shots ar
What's a realistic upper limit for polygon count now for an aircraft
model? 5000? 1? 25000?
What's definitely "out"?
Jon
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Title: Proposal: New external force capability for JSBSim
Dave Culp and I have been discussing the catapult and hook scheme for a while. That discussion has actually gone farther than that specific case, to planning for a capability that is a general one, for applying external forces to a JSB
John Denker wrote:
> This is getting somewhat OT, but it's fun, so I thought I
> would mention it:
>
> When you fly the Skylane RG, always take the tow-bar with
> you; don't leave it in the hangar.
>
> I guy I know had a gear failure involving loss of hydraulic
> fluid (not simply failure of
John Denker wrote:
> I observe that if the aircraft is initialized to an airborne
> position, the /gear/gear/wow property is stuck at 1,
> indicating weight on the wheels, even though the
> compression-norm property is zero.
>
>This initialization can come via the command line
>via --a
> The slipping is a numerics effect, not a modeling one.
> The only way to get the gear jitter to produce a stable
> solution over time is to push the coefficients *down*. But
> that will produce more slipping, not less. The solution to
> this problem is a rewrite of the static gear friction t
> On Friday 08 December 2006 12:06, Stuart Buchanan wrote:
> > Hi All,
> >
> > I recently bought a flex-wing microlight (aka "trike",
> "ultralight",
> > "hang-glider with a lawnmower engine"). Specifically, a
> Mainair Flash
> > 2 Alpha.
> >
> > There is currently a picture of it here:
> >
>
R. van Steenbergen wrote:
> On normal hands-off flight, my aircraft seems to consequently
> bank to the left. I've already double-checked my control
> calibrations and these are all dead center, the flight
> control indicators on the HUD give center as well. So far
> I've noticed this problem
Has anyone built this on Windows XP under Cygwin, yet?
Jon
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> On Thursday 09 November 2006 14:01, Jon S. Berndt wrote:
> > Is anyone else noticing any SourceForge mailing list problems?
> I'm not seeing my own posts now - I seem to get everything
> else OK though.
> And yes, I did check that the option was set to receive
> copies of my own messages (besid
Regarding low RPM engines: I'm not sure, but I think this has been
addressed in the version of JSBSim that is in JSBSim CVS. I guess we are
getting close to being due for a more recent version of JSBSim in
FlightGear.
Jon
-
U
> http://www.geocities.com/robitabu/fgfs_SW/SW_01.jpg
> http://www.geocities.com/robitabu/fgfs_SW/SW_02.jpg
>
> Oops! I guess EDDK is not a good spot where to hide my vehicle.
> Damn! They really don't stop chasing me :-(
I've actually considered making a flight model for an X-wing or other
Star
> Here is the first step of a more general update I want to
> implement for the
> X-15 (also including 3D cockpit and systems)
>
> So far I only modelled the X-15A-2. Depending on what flight
> dynamics are implemented I may change to X-15 #1 (basic
> aerodynamics and Stability Augmentation Sy
> Here's a graph that illustrates it:
>
> http://members.aon.at/mfranz/jitter.png [20 kB]
>
> Command line was
>
> $ fgfs --aircraft=OV10_USAFE --airport=krhv
> --disable-real-weather-fetch
>
> and a few settings in local preferences.xml (nothing
> relevant). SimGear & FlightGear from CV
Hi, Robert:
Not that it does you a lot of good if using the Net FDM,
but that feature is available in JSBSim if contact points are defined in
the aircraft configuration file. My guess is that YASim does that, too. It's
sort of a flight model feature. If you are providing your own dynamics,
> Hi all,
>
> Ealier today, I posted a message here indicating my
> intentions of committing the airway database code into CVS.
> For some reason, that email still hasn't appeared on the list.
There was an issue with the SourceForge mailing lists yesterday. I think
they are still catching up. I
> In the course of developing the KC135, I noticed that parts
> of the autopilot function do not work in that model, copied
> from the B737 - the bits described as vor/loc and app.
> Investigation showed that the cause was simple
> - in JSBSim a jet ac does not have vacuum system. No vacuum -
>
> In my view, the FlightGear GPL license covers our source
> code, but not content created with or used by that code
> (except for things like the base package which is explicitely
> licensed as GPL.)
In my mind, that is one reason why the approach taken by FlightGear and
associated projects lk
How did you design your autopilot? Do you have a block
diagram of the signal flow?
Jon
Hello, first let me
introduce myself. I am Jimmy Coley, a student at the University of West
Florida (UWF). I have been using simulators since MSFS98 was first
released, and Now I have migrated
> Hi,
>
> I am experimenting with structural icing and am hacking on a
> little nasal script that checks outside temperature and
> dewpoint to guess if the aircraft is currently in a potential
> icing area and pack some ice on the surfaces.
> To get ice on the wings one thing is needed besides
Title: Performance monitoring
Can anyone tell me what the name of the routines is that allows one to determine the performance details of a Linux application?
Jon
---
Using Tomcat but need to do more? Need to support web services, sec
Title: [OT] Simulators
As some of you may know, I am involved in supporting simulator development in my "day job", as are many of you. I got a tour of some simulator components that I had not seen before. One that I saw yesterday is used for training for proximity operations between the space
> > From: "Curtis L. Olson"
> >
> > And of course, every experienced unix professional knows
> > the original "vi" was already perfect.
>
> Not every. Some switched to emacs and thereafter would
> install emacs first before doing anything with a new machine. :-)
As mentioned here before, there
> Hi all,
>
> it's been a while, since I announced the model for a Seneca.
> It is a *LOT* more work, than I expected it to be so it took
> a lot longer than I thought.
> But I think I can show you what I have so far:
>
> http://www.t3r.de/fg/seneca/
>
> The site gives you a something to look
> Those are valid points from a JSBSim centric perspective,
> but from FlightGear we have other FDMs that don't support the
> same features so that fgfs has its own control methods
> independant of specific FDMs. An argument could be made for
> having a single control script for flying the same
The compass on the BF109 is 180degrees offJulien
Man
... that's gonna be a hard one to fix.
Jon
;-)
> Whats wrong with Concorde have the authors also taken this
> one out of commission ?
>
> It doesnt run , just says flightgear aborted no other errors.
>
> Cheers,
> Justin Smithies
Read the post from earlier today about the Concorde, "Re: FG core dump
when running Concorde". You'll find the
Title: Open Source Article
One of my [too] many outside activities is serving as the volunteer editor of Horizons, the online magazine for the local Houston chapter of AIAA (the American Institute of Aeronautics and Astronautics). The current issue (Jan/Feb) just now uploaded to our site has
Title: 3D models and Blender
If I'm not mistaken, the open source 3D modeing tool has been used to develop 3D models for FlightGear. Correct? Can the 3D models simply be opened in Blender?
Jon
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> Still having problems? Everything seems ok over here.
>
> Curt.
It appears that my simgear cvs update finally went through, and so I was
able to build flightgear, too. Did you notice a problem with simgear cvs
this morning?
Jon
---
This SF
> Second (and more important) a hopefully good guess about the
> VRP. I used the z value of the old 737, which seems to fit
> and spent half an hour trying to figure out the y value. I
> tested giving full left break and 90% thrust which keeps the
> plane spinning around the left main gear and
Title: 3D models
Is anyone aware of a converter that takes Moray 3D models to Blender?
Jon
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> I noticed when running the 737-300 model if i switch off the
> fuel pumps this has no effect on the engines at all.
> How can i make the pumps turning off have an effect on the
> engines etc.
> Also i'd like to implement the crossfeeds so i can have the
> switches in my cockpit too.
> Anyone a
Title: Quick question
Can FlightGear and associated files be written to a CD and run right off the CD?
Jon
> Erik Hofman wrote:
> >
> > This is a comment in the original (Cameron Munro & Cameron Moore)
> > configuration file which might give a clue:
> >
> >
> >
> >
>
> In the source file src/FDM/LaRCsim/cherokee_aero.c there's my
> interpretation of original aero data found in McCormic's
> book. I
> AJ MacLeod wrote:
>
> On Monday 23 January 2006 13:46, Jon S. Berndt wrote:
> > I've created a schema for the JSBSim aircraft configuration file.
The
> > XMLStarlet utility, xml, validates an aircraft flight model in less
> > than a second.
>
> Sounds nice... and since I'm currently working o
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