On Thu, 2002-05-30 at 22:16, Cameron Moore wrote: > * [EMAIL PROTECTED] (Jon Berndt) [2002.05.30 20:45]: > > > I have not been keeping track of changes on the JSBSim XML formats for > > > several months, so I'll try to update the -180 definitions tonight and > > > see what happens. I will let you know if I get anyway. I'm pretty busy > > > these days, so I'd be happy to hand this off to a willing 3rd party to > > > pick up the pieces. > > > > > > Anyway, I'll see what I can do tonight. Thanks > > > > You can probably just go ahead and write the model as you understand the > > JSBSim config file format. It hasn't changed much at all recently. Any > > recent changes should be easily and quickly fixable. > > I went through and updated the config that is currently in JSBSim CVS. > There were only minor changes needed to get it looking like the c172 > config. I did not make any changes to the aero coefs. I've uploaded > all of my changes to here: > > http://unbeatenpath.net/software/fgfs/PA-28-180/latest/ > > There's a -set.xml file there too that I basically just copied from the > c172. > > My tests show a strong tendency to roll left. I have to maintain about > 60% right aileron to maintain level flight. Replacing the Clb coef with > the c172 one seems to fix the problem, but I left the original coef in > place for someone with more know-how than me to look at it.
You need to add FG_BETA to the multipliers for Clb. i.e. replace: FG_QBAR|FG_WINGAREA|FG_WINGSPAN with FG_QBAR|FG_WINGAREA|FG_WINGSPAN|FG_BETA That way it will be zero when sideslip angle is zero. > > Also, the other most notible aero problem I can see is the data tied to > flap deflection. Pitch and drag seem to be a little high relative to > the flap positions, but I'm not sure. > > There are several places in the XML file that have "NEEDS WORK" or > "FIXME" by them. The only major piece that we hadn't gotten to was the > propulsion section. I believe the c172 defaults are still in place. > > Please feel free to do what you want with this aircraft. I've taken it > about as far as I can (with Cameron Munro's help, of course). If you > need any data, let me know, and I'll see if I can help. Thanks > -- > Cameron Moore > / Every so often, I like to stick my head out the \ > \ window, look up, and smile for a satellite photo. / > > _______________________________________________ > 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
