I had some time today to play with YASim stuff. New things in CVS: Fuel consumption has finally been implemented. It's pretty simplistic and doesn't support stuff like tank selection, engine-specific fuel feeds, inter-tank feeds (or fuel dumping), etc... But it seems to work. It probably also exposed a bunch of bugs in the engine fuel flow calculations, too. A spot check looks reasonable to me.
The out-of-fuel behavior is pretty cheezy too. The engines just act as if the throttle was at zero. For the piston engines this is fine, but for jets throttle==0 means "ground idle". Oh well. And Curt: this should also fix the tile loader bug where the data gets corrupted if you fly the A-4 for 3600km. I don't thinkg it can't get that far anymore. :) There is now a per-wing tunable "induced drag" number. One of the things that the YASim solver doesn't constrain is the drag-due-to-AoA coefficient. As a result, all aircraft were getting essentially the same behavior, and this turns out to be really draggy. The jets, and the A-4 in particular, were flying their approaches way behind the power curve. I found a throttle setting mentioned in an A-4E NATOPS manual that didn't jive with what the YASim model was requiring. So I put a hacked parameter in, and set the default to something more reasonable. The straight-winged aircraft won't notice any difference. It's only the high-AoA regime that changed. 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
