James Turner <[EMAIL PROTECTED]> said: > > On 8 Jan 2004, at 13:30, Jim Wilson wrote: > > > I think what you are trying to describe is called a "yaw damper". The > > purpose > > of this is to dampen out accummulated yaw energy that can result in a > > growing > > oscillation that will make your passengers sick (maybe even > > break/crash the > > aircraft). AFAIK we are only talking about swept wing aircraft > > Uh, I think people are getting their wires crossed here; as I > understand it, yaw dampers are a specific FCS module (or a totally > separate thing) that counters dutch roll in straight-and-level flight. > (It does this by driving part or all of the rudder).
Yes and no. That is the primary purpose of the damper in jets. In either case you are solving the same problem (undesirable yaw movement) with different causes. > What the original poster was talking about, was making the autopilot / > FCS models of specific aircraft coordinate accurately in their turns, > which is nothing to do with yaw damping, though it is to do with > driving the rudder. This is different again (in principle) to the > auto-coordination done by flightgear, since in the case being > discussed, this is something the actual real aircraft system presumably > also does. (whereas the FG thing is faking rudder inputs, I assume) > > Given the description of the 'goal' for the problem (keep the ball > centered), it does seem the idea of using some function of the yaw > acceleration would give sensible results, but I am not a FCS > designer.... Same as solution for dutch roll effect. No? Best, Jim _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
