On Tue, 28 May 2002 10:04:12 -0700 Andy Ross <[EMAIL PROTECTED]> wrote:
>Hopefully I got the conventions right. The point being not that >YASim's coordinate system is inherently better**, but that making the >joystick inputs match the coordinate sense is possible with a right >handed coordinate system. I don't know how the rudder pedals return a value. IIRC, the joystick returns a value based on a timer and ranges from 0 to some power of 2, depending on how far the joystick is yanked over. I assume the rudder pedals are similar. So, yes, it would not surprise me if the FlightGear (or plib) control "conventions" are linked to that. I suppose it's no big deal, really, just that we all agree. As far as aerosurface conventions go, however, yours is backwards from every one I have ever seen (but if it works for you it doesn't really matter). Both structural and body frames have the Y axis out the right wing. Aero conventions always (to my knowledge) place the coordinate system for each aero surface on that surface's hinge line and the frame is parallel (more or less) to the body frame (X out the nose positive, Y out the right side, z positive downward). Then, the elevator, flaps, rudder, etc. all obey the right hand rule when the surface is rotated about its hinge line. The exception is aileron command, for obvious reasons. A positive rudder deflection should result in a left yaw. I think if you stomp on the left rudder, this should be a positive rudder command, and you should get a left yaw, with the rudder rotating in a positive sense about its own Z axis. To the best of my knowledge, that's the way it works. Tony may comment on this if I'm off base. I've got so much going on now that I may be overlooking something. Jon _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
