Sounds good. However, on the topic of the rockets (and if you are referring to the existing JSBSim X-15 FDM), I just reworked the rocket engine code shortly ago. Don't use the external_forces section for rocket control. I've got tons of information on the X-15, some of which was gained using FOIA requests. Nowadays, you can simply use the NTRS, like you mentioned.
Jon > -----Original Message----- > From: flying.toaster [mailto:flying.toas...@voila.fr] > Sent: Sunday, January 04, 2009 4:08 PM > To: flightgear-devel > Subject: [Flightgear-devel] X-15 update > > I have resumed work on the X-15. > > I want to model every single thing (from the last bottle of hydrogen > peroxide to the historical launch sites) for three aircraft > configuration : > X15 #1 : Old style flight deck, old style SAS and RAS (later standing > for Reaction Augmentation System). > X-15 #2 : X-15A2 configuration with drop tanks and new airframe (the > one that set the speed record and almost burnt in the process of doing > so) > X15 #3 : New style flight deck, Adaptive Flight Control System (a.k.a.: > MH96), but basic airframe > > > Here are a few hurdles I still have to overcome : > > I've got myself a lot of documentation (in part thanks to the Nasa > Technical Report Server), yet some of the documentation may not be > available for download (have to collect a list and then see if it can > be ordered) > > Quite interestingly I guess there is some inconsistency in the > references of the current FDM. Particularly, an article on the MH96 is > mentionned as the basis of the SAS gains...That would make the current > FDM representative of the X15 #3 configuration. The thing I am missing > is that the MH96 apparently used a feedback loop to vary the control > gain, which I do not find in this FDM. What's more, the MH96 used a > model of the aircraft in order to impose an artificial behavior (the > aircraft remained at constant g at low speed without trim for > instance). The original SAS was much simpler, the pilot choosing the > gain according to the mission among 12 preset (discrete resistors !) > values per axis > > I think I will have to resort to external forces for all rockets in the > aircraft (including the main one). Rate of consumption for fuel and > oxydizer needs to be adjusted according to which tank is tapped by > which rocket (if you count Ballistic Control System, and the 2 stage > igniter, there were something like 17 rockets on this aircraft). Some > of the rockets use monopropellants (H2O2 for the ballistic controls) > and even more gruesome, the APU is served by the same tanks as the > reaction control rockets (BCS), and can be crossfed by the main engine > turbopump supply. > > If anybody can give me help in the form of information and/or advice > > wish me luck ;) > > ____________________________________________________Consultez les > dernires news dIndochine et coutez leur single Little Dollssur Musiline > Voila! http://musiline.voila.fr/resume/235 > > > > ----------------------------------------------------------------------- > ------- > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel ------------------------------------------------------------------------------ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
