Curtis L. Olson wrote: > Andy, I think YASim has a bug. :-) > > YASim: 0.000000 AGL > 4.946215 ASL > YASim is saying that the CG is exactly on the ground level > which is physically impossible. It compensates by saying the > ground level is 4.9' above the real ground level. I think > this is a bug, but it probably looks ok visually.
Believe it or not, this was actually intended as a feature. :) The MSL value that YASim supplies is the position of the nose of the aircraft, and agrees with the other FDMs and with reality. But the AGL is computed as the distance from the nearest gear tip to the ground. This was done for things like radar altimeters and jetliner annunciators -- the altitude of the 747 on the runway is something like 100ft, which isn't right if what you're trying to drive is a touchdown annunciation. I wasn't aware that anything was interpreting this as a "hard" position anywhere. An AGL value seemed like a "soft", computed number that I could fudge at will. Fixing this is trivial (it involves removing a few lines of code, and adding none). But what is the desired behavior? To me, it would seem nice to have a number like the AGL value YASim reports -- something that instruments can interpreted as a height of the wheels above the runway. Andy -- Andrew J. Ross NextBus Information Systems Senior Software Engineer Emeryville, CA [EMAIL PROTECTED] http://www.nextbus.com "Men go crazy in conflagrations. They only get better one by one." - Sting (misquoted) _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
