Melchior FRANZ wrote > > * Oliver Schroeder -- Tuesday 19 June 2007: > > attached is a patch for the osg-branch, > > which will introduce a new pseudo FDM for ground vehicles > and (large) > > ships. The FDM isn't perfect, but good enough to allow driving > > vehicles. > > I'd very much like to have a car FDM. A realistic one like > Curt mentioned. But this suggested FDM is even less > sophisticated than the ufo, and I guess that a special yasim > config would make a far better car. So, if it isn't a serious > FDM from the beginning, then I think we are better off with a > car-o-matic script, which -- in analogy to jsbsim's aeromatic > -- would knock out yasim configs from simple car properties. > > m. >
To follow these remarks - there is a quite sophisicated pseudo-fdm already in AIShip, which takes into account turning circles, rudder angles, speed, and acceleration and rolls and steers the ship accordingly. This code is able to accept inputs of the form of target course and speed, or direct input of rudder angles. Is there something wrong with it? I also have doubts that a single fdm can accurately reproduce ship and car characteristics - a ship isn't a big truck which travels over sea rather than land. Ships do not respond immediately to rudder inputs, and to stop a turn they require counter-rudder. They also roll in turns. In this sim the 100,000 ton Nimitz seems to have no mass, and a turning circle significantly tighter that a destroyer. Max rpm is more likely to be 250 rpm than 2500 rpm. Take it from an old salt - this is the least ship like ship simulator I have come across. I love the views - particularly the bridge. Somewhere along the line, I seem to have lost the wake here, which spoils some of the views a bit. Don't know if these comments are particularly helpful, but I fully support your intention to have a MP carrier. However, it's fun for a few minutes to steer a carrier, or it might be if it were a lot more realistic, but actually, I'd like this automated, so that I can fly off the darned thing, and not be a taxi-driver for the Airedales. Vivian ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
