Re: [Flightgear-devel] Re: Problem with steering plane o WinXP
Tymoteusz Puciek Paul wrote: You don't see what i'm trying to tell. I'm trying to tell that whole plain is shaking. What you are probably seeing is a long standing and well known weakness in the ground force modeling in JSBSim that shows up as your speed gets closer to zero. YAsim's ground handling isn't perfect either, but it has a reasonable solution to this particular problem. The JSBsim developers are focusing on some other really important areas right now, but I'm sure at some point they will tackle this nagging ground force handling issue. Regards, Curt. -- Curtis Olsonhttp://www.flightgear.org/~curt HumanFIRST Program http://www.humanfirst.umn.edu/ FlightGear Project http://www.flightgear.org Unique text:2f585eeea02e2c79d7b1d8c4963bae2d ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Re: Problem with steering plane o WinXP
Tymoteusz Puciek Paul wrote: Well i know that, but let's look at cessna, when engines turned on, brakes on so it stay in place but turn controler (as whole plain) shake as he wan't to go but he can't (throttle set to 0) JSBSim planes* shake a little when they are on the ground due to the way the gear modelling works. This is only really noticeable when the aircraft is stopped; once you are rolling for takeoff it's basically irrelevant. * YASim has the same issue, but to a lesser extent. This is because of the way ground reactions are stiff numerically, and it's hard to fix. As with all bug reports about aircraft handling, it's really important to be specific about what you are reporting. What, exactly, are you doing in FlightGear? What, exactly, is the behavior you see? What, exactly, is the behavior you *want* to see? Andy ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Re: Problem with steering plane o WinXP
Le samedi 07 mai 2005 17:11 +0200, Tymoteusz Puciek Paul a crit : You don't see what i'm trying to tell. I'm trying to tell that whole plain is shaking. I understand now !?!?!? It happened to me with one Aircraft the F104 which was jumping and dancing on the runway !!! :-) It happened with an other personal Aircraft F15 using the jsbsim file -- f15.xml And that happened with Yasim when i made e personal model of helicopter I solved the problem by modification of the gear spring and damping, these values are very sensitives. I do not notice difficulties with the others Aircraft which are good. A crazy question: which Airport are you using ? do you use fgfs 9.8 ? I remember now i had difficulties with an old version of fgfs and old version of scenery on some airports (don't remember which) Gerard ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Re: Problem with steering plane o WinXP
Le samedi 07 mai 2005 01:23 +0200, Tymoteusz Puciek Paul a crit : It was the same as in all plains On 5/6/05, Tymoteusz Puciek Paul [EMAIL PROTECTED] wrote: Well i got problem with flight gear on win xp, (amd athlon xp 2600, 1,9ghz, 512 mb ram, ati radeon 9550, no joystick installed or plugged). When i start fly (after choosing plain, airport, setting that i use keyboard) the plain is going forward it self, and, usualy it rotate left or right (on helicoprtes he can even make more han 360 degre rotate without aking off ground.) it happends on all plains. When i start a plain, i need to manu all time to steer formward, other way adter some meters i'm out of starting road +_+ I don't know why this happend, and this make me less happy :( -- Contra spen vado I am not sr the answer is correct regarding your problem. When you start on fgfs with an Aircraft whose the engine(s) is (are) running and the parking-break OFF. That Aircraft will begin to run and because of the wind and dynamics effects will be pushed immediately on one side and never stay quietly in place straight ahead. Because you are the pilote As des As, you have to manage with the rudder, in order to keep a straight way.It is not so easy This depend partly on the mass off the aircraft: -- C170 light hardly pushed -- A380 heavy less pushed. The helicoptere needs a specific pilote it is not aircraft generic Let's conclude FGFS is not a game it does not look like any commercials games. Gerard ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Re: Problem with steering plane o WinXP
Le samedi 07 mai 2005 02:37 +0200, Tymoteusz Puciek Paul a crit : Well i know that, but let's look at cessna, when engines turned on, brakes on so it stay in place but turn controler (as whole plain) shake as he wan't to go but he can't (throttle set to 0) OK: Every aircrafts move sightly more or less according to the mass and the side area. Throttle set to 0 does not mean no thrust. The RPM engine is about 700 and the pitch of the propeller is 22 The addition of forces (vibration thrust wind ) makes the aircraft moving. If you can look at the content of the FGFS programme source, you will discover complexe calculations some of them are close to real simulators. In spite of simplifications It try to be close to the reality. Gerard ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
