On Wednesday 08 February 2006 06:29, Martin Spott wrote: > Lee Elliott wrote: > > However, if people are flying it and liking it I don't want > > to break it for them, so it would be handy if people could > > let me know if they're using cvs FG or the last official > > release, > > I've almost always been using CVS. > I honour your intention not to break anything, on the other > I'd be happy if you manage to get more detailed information on > the 'real' thing to make the FlightGear model behave more > realistic. > > Cheers, > Martin.
Ah - sorry Martin, I knew you were using cvs, That's encouraging though because when I first tried A-10, after finding that it still solved without needing any changes, I thought it still flew ok. Mind you, I've not been able to get my joystick working after moving to a 2.6.15 kernel and Alsa so I've only been able to use the keyboard or mouse - not ideal. I try to get as much real info into the model as I can find but I think that sometimes you've got be careful about the datum under which the info applies. For example, I've seen a good performance plot for the A-10 and normally I'd pick the altitude and speed that I thought most appropriate and use those, together with max-throttle, for the cruise params (currently 0ft & 380kt, which seem to be the max-speed conditions) but I also know from a good book on the A-10 that I have, that the A-10 has a 'loiter' mode where one of the engines is shut down to save fuel. The plane then just flies a race-track pattern somewhere convenient until it's either needed, relieved or can otherwise go home. In addition, I believe that the service ceiling is 45k ft and I don't think that the current cvs version can manage either the single engine loiter mode at a reasonable altitude or get anywhere near 45000ft. That was the basis of my thinking for using the loiter mode for the cruise params but then the problem is what altitude and speed do I use? I haven't found any actual numbers. One problem is that there's always a lot of stuff that nearly always has to be deduced e.g. the lift and drag from flaps and spoilers, but where I can get real numbers I use them. In fact, I'd like to make it clear that the A-10 isn't 'my' aircraft - it's GPL'd and part of the FG project, so anyone can fiddle with it. The only thing I wouldn't be very happy about would be if someone, while working on the fdm, wanted to use inaccurate numbers where accurate numbers were known, or at least not without having a well thought out reason for doing so. Having said that, wing geometry definitions are nearly always something of a compromise between the real shape of the wing and what you can specify in YASim, but then that's something that has to be well thought out. Anyway, back to the A-10 - would you like to try the current version that I have? I'd welcome your feedback and would enjoy collaborating with people on improving the fdm. LeeE ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
