[Flightgear-devel] Where could I get this paper?
Bray, Robert M. A Wind Tunnel Investigation of the Pioneer Remotely Piloted Vehicle. Montery, CA: Naval Postgraduate School, June 1991. thanks ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Cloud rendering
It looks nice! Any volenteers? http://www.cs.unc.edu/~harrism/clouds/RTCRDownload.html Erik ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: Re: [Flightgear-devel] Translate linear model of Pioneer UAVto JSBSim?
Jon wrote: The data is all there. In fact, the model files the UIUC guys use present pretty much the same information that JSBSim does. Perhaps someone could write a translator? On Thu, 11 Apr 2002 13:33:30 -0500 Michael Selig wrote: Some thoughts - I think it would be *mostly* pretty easy to convert the UIUC models to JSBSim models. What stops me is that there are A LOT of parameters in JSBSim, and I don't think they're all documented nor needed for flight. I am not sure of this, but I have followed some threads related to created JSBSim models from scratch. Granted, we need to write up a solid document describing the meaning and layout of our config file. God! I'v paied so much time to understand the config file and still not understand completely. //blush Right now I think folks might want to seriously consider using the UIUC models as a precursor to developing a JSBSim model. Most of the UIUC model info is related to aerodynamics and flying, and not so much related to the realism of sitting in the cockpit scanning instruments and listening to the sounds and seeing all the sights. Just to clear things up, the ONLY thing in the JSBSim aircraft config files that is unrelated to flight modeling is the pilot eyepoint, and even this has some utility. The rest is all flight-related. We do not include any visual/ sensory parameters in our config files. :) Such discussion should have be done a long time ago. Lately, I've been more interested in modeling nonlinear aerodynamics and aircraft that are interesting aerodynamically and visually like: - Wright Flyer, which I've been talking about - What was it really like to control this airplane aerodynamically? Is there or will there be a set of aero coefficients from the UIUC guys? So I've got models of these. -Ornithopter - A crazy as it may sound, Prof DeLaurier at the Will you be doing ice testing on this one? ;-) Those inclined could then convert them to JSBSim format for more realism where needed. I'm holding my breath :-) It seems that in currently UIUC models only the UAV Pioneer has the most complete nonlinear arguments. How about try to make a UAV Pioneer nonlinear model from LarSim to JSBSim? Jon ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] Question about C172 approach and landing
I am driving the C172 to approach and land on the airport. (1) What are the speed and altitude the plane should be before Gliding slope? 1000 feet and 65 KCAS? I heard that the stall speed is about 50 KCAS. (2) When Gliding slope , should we must follow the flight path angle with -2.5 degree? and how should I control the throttle to prevent the speed increasing too much? (3) What is the altitude at which we must begin to pull-up the plane to decrease the Vd? 50 feet? (4) How to shut down the engine in JSBSim? just FCS-SetThrottle(i,0)? thanks ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] Translate linear model of Pioneer UAV to JSBSim?
Why not translate nonlinear model of Pioneer to JSBSim? http://amber.aae.uiuc.edu/~jscott/sis/models/ Are current plane models with LaRCSim in FlightGear all linear? Flying with LaRCSim and UIUC models are easier than with JSBSim and C172. I notice that in http://amber.aae.uiuc.edu/~jscott/sis/models/, only Pioneer model is mostly nonlinear data with some linear stability derivatives, and Bray, Robert M. published a paper -- A Wind Tunnel Investigation of the Pioneer Remotely Piloted Vehicle. why not translate the nonlinear model of Pioneer here to JSBSim? So we can fly more actually. I think it is not too hard if you are familar with aerodynamic. If nobody would like to do that, I'll try. who can help me? Dirty Bear [EMAIL PROTECTED] ¡¡2002-04-09 ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: Re: [Flightgear-devel] Plotting tool
JSBSim can output data to the console or to a file in .csv format (comma separated values). JSBSim can also write the data out to a socket. See FGOutput.cpp and FGfdmSocket.cpp for more information. The socket approach is nice for real time stuff. Flightgear may have some or all (and more) capabilities than this for logging, but perhaps not all of the desired flight dynamics data is available that way. Yes, It is. I would better if the socket approach use UDP broadcast socket to output data. UDP Broadcast socket would be faster than stream socket(TCP), and so we can add more than one other modules which want JSBSim data in real time. I am now using a module to receive JSBSim's output from socket and relay to other modules. and I am going to modify FGOutput/FGFDMSocket for UDP broadcast socket. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: RE: Re: [Flightgear-devel] JSBSim Body Axes question
The definition of a positive aileron deflection is when the right-hand aileron deflects according to the right hand rule - that is, trailing edge down (TED). Unfortunately, this results in a negative roll rate - it would be nice if our choice of coordinate system caused a positive aileron deflection to result in a positive roll rate, but this is not the case. :-( Anyhow, yes, Tony wanted to control each aileron individually, so this was changed. It *should* *be* the same to you and I. It's just that the left aileron will get the negative of the right aileron deflection. A control system *could* use the ailerons as flaps AND as ailerons. These are called flaperons. The space shuttle uses the wing outer control surfaces as ailerons and elevator. These are called elevons. You might also combine flaps, spoilers, ailerons, and elevator and call it a slapevon. Well ... maybe not. ;-) In any case, Tony was right to split out the left and right aileron controls because we might want to model an aircraft that addresses various control surfaces in unique and interesting ways. Jon Yes, It is necessary to control the ailerons separately for widely use. I just found that a positive aileron pos result in a positive roll rate -- the JSBSim version is downloaded 2 weeks ago. It run with C172 model. and I did a little change. If you can be sure that positive aileron pos would result in nagative roll rate, that must be my matter. Let me check it . thank you for your patience. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: Re: [Flightgear-devel] JSBSim Body Axes question
On Tue, Apr 02, 2002 at 11:05:18AM +0800, wrote: Could someone help me out please? In the JSBSimCoordinates.pdf from http://jsbsim.sourceforge.net, we know that the Xbody Axis positive forward out through out the nose of the plane, Ybody positive out the right side, Zbody Axis positive downwards. Then we know that: (look from the tail of the plane) (1) roll rate (p) clockwise are positive; (2) roll angle (phi) clockwise are positive; (3) left-aileron up and right-aileron down are positive; Right? The flight controls follow the right hand rule relative to the body axis system. This means that *both* ailerons are positive trailing edge down and negative trailing edge up. In the older version of JSBSim, we control the two ailerons at the same time. The turnning orientation of them are opposite(One up , another down)? if so , left-up and right-down are positive? In the newer version of JSBSim , we can control the two ailerons separately. then Can they somtimes act as flags do? and what is the positive position of them? I am using the older version of JSBSim with ailerons controled simultaneously. thanks. Assume the plane flying steadily now, if aileron left-up and right-down , that is aileron position increase , the plane would roll anti-clockwise, that is roll rate (or roll angle) would decrease? Right? But why does JSBSim not match it? When I increase aileron position, the roll rate and roll angle increase too. Who can tell me why? ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel -- Tony Peden [EMAIL PROTECTED] We all know Linux is great ... it does infinite loops in 5 seconds. -- attributed to Linus Torvalds ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: Re: [Flightgear-devel] engine sounds with UIUC models
On Fri, 15 Mar 2002 14:20:49 -0500 Michael Selig writes: If we do add the myriad properties for many aircraft configuration types to LaRCsim.cxx it means adding lots of code I think. [3] The properties structure is pretty general. It seems like it would be pretty easy to trample over someone else's property definitions and/or make poor/improper usage of them? Is there a standard list of reserved properties? David M. replied: Nothing's been finalized, but I haven't heard any screaming objections. When you want to put information into one of the existing subtrees like /surface-positions or /engines, it would probably be a good idea to post a short message to see if the other FDM maintainers are willing to go along. Jon replies: The best solution would be for the UIUC guys to bite the bullet and port their work to use JSBSim. :-) :-) :-) Jon Support :-) ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: Re: [Flightgear-devel] How can JSBSim start in the air with astable manner?
On Tue, 12 Mar 2002 12:23:23 -0800 (PST) Tony Peden [EMAIL PROTECTED] wrote: As for trimming in standalone mode, this is not quite implemented, yet. I want to do this, but this particular capability is not quite ready, yet. Well, what I'm sure Jon means is that you currently can't use it via the XML scripting. You can always, however, write the C++ needed to do it. I will try to send you an example when I get home. Oops! Yes, that's what I meant. Jon Thank you very much! I am waiting for u. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] How can JSBSim start in the air with a stable manner?
I have learned JSBSim for quite a long time. The aerodynamics/Flight control(and so on) are not so easy to me. One of the so many problems is that How can I initialize the airplane in the air in a stable manner when JSBSim running in standalone mode? It seems that FGTrim can accomplish that. But I do NOT know how to use it! I found that you have discussed this problem in last year. http://www.menet.umn.edu/~curt/lists/fgfs/archive-200101/msg00404.html But I seems that no result about the discussion. I have read some of the JSBSim source, but still do not know how to solve the problem. Could you give me some idea about that? Thanks for your patience! Dirty Bear ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] UIUC models update
Where can I get the 3D models with .3ds format? or how can I translate them to .3ds? Is there anyone convert the model of the Pioneer UAV into the JSBSim format? If anyone has them, I'd like to get publicly released 3D models for: - Wright Flyer (I have one, but we have not yet got permission to give it out) - SGS 1-36 - Pioneer UAV - Marchetti S-211 - Learjet 24 - Piper Cherokee I included a link to Wolfram's site for all of the other 3D models. Back to more modeling! Regards, Michael ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] How does FlightGear synchronize the simulation time and the real time?
In other world, How can FlightGear make the simulation time the same as the real clock time? I am a newer. Thank you for your patience. Dirty Bear ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] About LaSRS++
Thanks for your reply to my previous mail. I known about LaSRS++ from http://www-sdb.larc.nasa.gov It is derived from LaRCsim and written in C++ and OOP and the document in http://www-sdb.larc.nasa.gov/aiaa/aiaa.html I know that FlightGear use LaRCsim as its default FDM and now JSBSim I want to ask that there is anyone know more about LaSRS++, such as can it run under linuxor Cygwin and where can I download the source code? Would LaSRS++ be a better FDM for FlightGear? Thanks Dirty Bear
[Flightgear-devel] What's syms.h which included by LaRCsim?
I could not find syms.h in Linux or the package of LaRCsim. What is syms.h? Perhaps I should not have asked such question here. But I am a newer. I want to use LaRCsim in my simulator. where can I join the LaRCsim mail list? Thanks. Dirty Bear
