Jim Wilson wrote: > It isn't tedious at all, we can offset the origin to where we want > without messing with the ac file *and* it won't affect the > animation.
Cool. Uh, how? :) > Having the FDM origin at the center of gravity should improve the > appearance of the 3D modeling since pitching of the model would appear > more realistic. It wouldn't matter. The FDMs do the dynamics for you. You could put the origin of the model on Mars* and the model would rotate correctly on the screen so long as the origins agreed. The aircraft rotates about its "real" c.g., which has nothing to do with either the 3D model coordinate conventions or the YASim coordinate origin. * Well, not on Mars due to precision issues. Maybe Sri Lanka. > It could be that the brakes are too good. If you locked the wheels > up at 40kts the 747 _maybe_ would stop that quickly...not sure. It > is quite a mass, as you know. I think the tires get a 0.6 dynamic friction coefficient. The way the physics works, the mass doesn't matter. Anything (aircraft, trucks, bicycles, roller blades) sitting in 1G of gravity on a flat surface decelerates by the same amount. The reason the real aircraft can't stop via wheel braking alone is because the brakes would melt. The tires could stop it just fine if you could put all the kinetic energy somewhere. The reason the pitch changes so much when braking is because the nose gear travels too far. Try the gear compression fix I mentioned earlier. 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
