[Flightgear-devel] elusive segfault
Curt mentioned getting segfaults once in a while back about a month ago. Three times in a row I recieved a segfault landing the c310 at KSQL on long approach, from the east (take off from default KSFO and do a U turn). It happened shortly after hitting the threshold. The fourth time I ran under gdb with the exact same aircraft (c310u3a-3d) and it did not crash. Anyway, if someone wants to take a short ride and can use gdb, we might be able to get a backtrace (if enough people try). Best, Jim ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] ..OT: cvs as company data backup server engine?
Curtis L. Olson writes: Danie Heath writes: Hi, A few days ago I couldn't even spell CVS, and then I implemented it for our company. It definitely is not worth it if the user's aren't clued up. I added Perl scripts, web interfaces, you name it. But unfortunately, the user factor always come into play... We went through the process (here at my work) of CVS's a couple development projects. I had only been awake for 4 minutes when I wrote the previous sentence. Sorry ... :-( We had the benefit of the boss saying you will use CVS and one of the developers already being familiar with it, so we had some momentum to start out with. But once we helped the others over the hurdles, every one has really like it. (should be liked) But I'd only use cvs as a backup system if the files in question were ascii. If many of the files are binary, you could quickly run into space problems. Regards, Curt. -- Curtis Olson IVLab / HumanFIRST Program FlightGear Project Twin Cities[EMAIL PROTECTED] [EMAIL PROTECTED] Minnesota http://www.menet.umn.edu/~curt http://www.flightgear.org ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel -- Curtis Olson IVLab / HumanFIRST Program FlightGear Project Twin Cities[EMAIL PROTECTED] [EMAIL PROTECTED] Minnesota http://www.menet.umn.edu/~curt http://www.flightgear.org ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] command line parameters
my operating system is windows milenium and I tried to change my aircraft via entering flight\FlightGear\runfgfs.bat ''--aircraft=4a-yasim'' into the start\run directory but the simulation didn't start. You can also pass command line options from Sec. 4 to the batch file (if running it form a Command shell). However, you have to enclose them in double quotes. writes in the install guide. What is the batch file is it the runfgfs.bat and the command shell is the run directory. If it is my setting had to work. I want to change the default fdm to external for a program that I downloaded to control the simulation and I also want to fly with different aircrafts. Can you please give me an example. The example might also be in dos too if it can work like this. _ MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. http://join.msn.com/?page=features/virus ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] changing aircraft
On Wed 12. March 2003 18:18, you wrote: my operating system is windows milenium and I tried to change my aircraft via entering flight\FlightGear\runfgfs.bat ''--aircraft=4a-yasim'' into the start\run directory but the simulation didn't start. You can also pass command line options from Sec. 4 to the batch file (if running it form a Command shell). However, you have to enclose them in double quotes. writes in the install guide. What is the batch file is it the runfgfs.bat and the command shell is the run directory. If it is my setting had to work. I want to change the default fdm to external for a program that I downloaded to control the simulation and I also want to fly with different aircrafts. Can you please give me an example. The example might also be in dos too if it can work like this. Did you tried runfgfs.bat ''--aircraft=a4-yasim'' ? regards, Madr ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] changing aircraft
Mehmet, [mailto:[EMAIL PROTECTED] Behalf Of Martin Dressler Sent: Wednesday, March 12, 2003 6:40 PM Did you tried runfgfs.bat ''--aircraft=a4-yasim'' ? just tried it and it works for me (as stated in the guide) from a command shell. You have to open a command shell (cmd.exe in Win XP), first, and change to the base directory (where runfgfs.bat is residing). Regards, Michael -- Michael Basler, Jena, Germany [EMAIL PROTECTED] http://www.geocities.com/pmb.geo/ ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] P-51D
Jim Wilson wrote: Take a look at this: http://www.spiderbark.com/fgfs/p51d-01.png This might be a good set of textures for your mustang: http://ftp.avsim.com/library/esearch.php?DLID=27843CatID=CFSAC It suggest GPL compatibillity (License: Freeware) but it might be a good idea to check this. Erik ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] JSBSim Coefficients Intro
Jon S Berndt writes: Ha! That's probably a better title than Modifications of Stability Derivatives and Aerodynamic Coefficients in JSBSim. The latter might scare people away, whereas yours draws them in. ;-) It is also an accurate description of the noise my O320 engine makes at me when I try to start it in cold weather. Let me know when you find the mistakes that (I'm sure) are present. All the best, David -- David Megginson, [EMAIL PROTECTED], http://www.megginson.com/ ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] P-51D
Erik Hofman [EMAIL PROTECTED] said: This might be a good set of textures for your mustang: http://ftp.avsim.com/library/esearch.php?DLID=27843CatID=CFSAC Wow. I've seen quite a few repaint contributions, but those really are very nice. My intent is to do a paint of the half half to match Jon's logo, but if I could start with these for the wings and whatnot... It suggest GPL compatibillity (License: Freeware) but it might be a good idea to check this. Already sent the email. Thanks, Jim ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: Segmentation fault in FGTower -- ASI and nav still broken!
- ALL planes show a discrepancy between the HUD speed readout and ASI on the panel. If the HUD shows IAS, why does the ASI show less at altitude? (They agree at sea level.) The HUD shows CAS, actually. We're not modelling errors deliberately right now, but eventually the ASI will always be a little off from the CAS. OK, but the IAS and CAS should be reasonably close to each other. I think the difference is simply too big, and it also increases with altitude like that between TAS and IAS should. I don't think 260 KIAS can lead to 320 KCAS at 12000ft, which I just got when flying the 747-yasim. - The combined Nav1 instrument clips the VOR/LOC needle. Again, this shows up in all aircraft I've tested, but the effect depends on the FDM: Do you mean the HSI? I haven't used that much, so it's hard to comment. Who originally designed it? Not sure what it's called, it's the instrument present on many FGFS aircraft that shows a compass rose, a VOR/LOC and glideslope as well as an RDF. Andras === Major Andras e-mail: [EMAIL PROTECTED] www:http://andras.webhop.org/ === ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] More weirdnesses
This one is mainly for fun, not to urge anyone to fix anything... - Using wheelbrakes on the F16 model is not a good idea! Why I just managed to crash it into the ground (gear contact!) at 12000ft straight above KSFO is also beyond me. - Does EGHC really have grass strips only? (I know BAe146 etc. fly in and out of there in the real world.) - Do the guys at SLLP really need 4 (!) water towers right next to the runway? - Does that office block really protrude onto the runway at EDDS? It's actually quite fun to fly FGFS with all these little flaws! Once FGFS reaches fully mature level, how about adding a switch to make things buggy intentionally? Would be a bit of a challenge! Imagine making an IFR approach in dense fog and finding a water tower, building, or cow on the runway just before touchdown... Andras === Major Andras e-mail: [EMAIL PROTECTED] www:http://andras.webhop.org/ === ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] More weirdnesses
Major A wrote: This one is mainly for fun, not to urge anyone to fix anything... - Using wheelbrakes on the F16 model is not a good idea! Why I just I know. I still have to look into that, and see what causes it. Off course it not a good idea to use wheel brakes before the plane is almost in a stand still, but there definately is a problem there. Also, the F-16 _is_ still work in progress, although the panel is coming along nicely with a functional DED (Data Entry Display), a visible ICP (Integrated Control Panel) and a partly complete realistic HUD (which are in the new updates I sent John today). It needs some more refining (adding a Backup Attitude Direction Indicator for one) and a nice 3D model. But the FDM configuration still needs some more attention too. Erik ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: Segmentation fault in FGTower -- ASI and nav still broken!
Major A writes: OK, but the IAS and CAS should be reasonably close to each other. I think the difference is simply too big, and it also increases with altitude like that between TAS and IAS should. I don't think 260 KIAS can lead to 320 KCAS at 12000ft, which I just got when flying the 747-yasim. Let me know if it's better now. All the best, David -- David Megginson, [EMAIL PROTECTED], http://www.megginson.com/ ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: Segmentation fault in FGTower -- ASI and nav still broken!
OK, but the IAS and CAS should be reasonably close to each other. I think the difference is simply too big, and it also increases with altitude like that between TAS and IAS should. I don't think 260 KIAS can lead to 320 KCAS at 12000ft, which I just got when flying the 747-yasim. Let me know if it's better now. Looks a lot better, thanks. Andras === Major Andras e-mail: [EMAIL PROTECTED] www:http://andras.webhop.org/ === ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] engine efficiency
David, This is probably obvious, but according to my study materials for the instrument rating, the efficiency of a jet engine depends on the temperature differential between its combustion and the outside air temperature -- that's why jets are very efficient flying near the tropopause at around -60 degC, but burn more fuel for less power in warmer temperatures (i.e. lower). Is YASim taking that into account? Just out of interest, what material is this (who wrote/published it)? Does it give a formula, or at least a reason for this? (I'm asking because I suspect that the author got something very wrong here.) Andras === Major Andras e-mail: [EMAIL PROTECTED] www:http://andras.webhop.org/ === ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] engine efficiency
Major A writes: This is probably obvious, but according to my study materials for the instrument rating, the efficiency of a jet engine depends on the temperature differential between its combustion and the outside air temperature -- that's why jets are very efficient flying near the tropopause at around -60 degC, but burn more fuel for less power in warmer temperatures (i.e. lower). Is YASim taking that into account? Just out of interest, what material is this (who wrote/published it)? Does it give a formula, or at least a reason for this? (I'm asking because I suspect that the author got something very wrong here.) It's from the Canadian Forces Air Command Weather Manual (which is quite good, at least for weather). Here's the relevant passage: The performance of an aircraft depends on several factors, among which temperature is important. The efficiency of a jet engine depends in part on the difference between the outside air temperature and the maximum temperature attainable in the combustion chamber. When the air temperature increases above a certain value, depending on the altitude, the true airspeed and the aircraft efficiency both fall off, the aircraft's operating height is reduced and there is an increase in fuel consumption per mile. All the best, David -- David Megginson, [EMAIL PROTECTED], http://www.megginson.com/ ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] engine efficiency
Just out of interest, what material is this (who wrote/published it)? Does it give a formula, or at least a reason for this? (I'm asking because I suspect that the author got something very wrong here.) It's from the Canadian Forces Air Command Weather Manual (which is quite good, at least for weather). Here's the relevant passage: The performance of an aircraft depends on several factors, among which temperature is important. The efficiency of a jet engine depends in part on the difference between the outside air temperature and the maximum temperature attainable in the combustion chamber. When the air temperature increases above a certain value, depending on the altitude, the true airspeed and the aircraft efficiency both fall off, the aircraft's operating height is reduced and there is an increase in fuel consumption per mile. Thanks. That doesn't give away much of what the author thought... It all seems a bit funny -- if the efficiency drops at a given air temperature, then where does the combustion temperature come in? And why is the change not continuous and smooth? Anyway, I suspect the author read about the optimal efficiency of thermodynamic engines somewhere, and abused the efficiency of the Carnot cycle here... that efficiency is indeed 1-T1/T2, where T1 and T2 are the lowest and highest temperatures in the cycle, respectively. BUT it only applies to closed-cycle processes, which the jet engine's combustion process definitely isn't. Also, it is only a theoretical maximum that is technically difficult to get close to. Andras === Major Andras e-mail: [EMAIL PROTECTED] www:http://andras.webhop.org/ === ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] Call it a day.
It's good to come home after a long day at the office: http://www.a1.nl/~ehofman/fgfs/download/F16-KSFO.jpg Erik (Good night) ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Call it a day.
Erik Hofman writes: It's good to come home after a long day at the office: http://www.a1.nl/~ehofman/fgfs/download/F16-KSFO.jpg Erik (Good night) Very nice. :-) The F-16 flies really well (not that I know what an F-16 is supposed to fly like.) Ground handling (especially braking) needs some work, but it's coming along very nicely. Good work! Curt. -- Curtis Olson IVLab / HumanFIRST Program FlightGear Project Twin Cities[EMAIL PROTECTED] [EMAIL PROTECTED] Minnesota http://www.menet.umn.edu/~curt http://www.flightgear.org ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Call it a day.
Curtis L. Olson writes: The F-16 flies really well (not that I know what an F-16 is supposed to fly like.) Ground handling (especially braking) needs some work, but it's coming along very nicely. I don't know -- it seems pretty touchy. You come in just a few hundred knots too high and the flare lasts forever. All the best, David -- David Megginson, [EMAIL PROTECTED], http://www.megginson.com/ ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
