After having some problem controling my rudder i decided to play around with the yaw damper configs and found this weird message. when I put the Right rudder yaw damper button (in the overhead panel) in the INOP mode, it gives me a "auto coord off" message in my system status display. In the PIC manual they say this is a FS2000 feature.Does it affect the playability in FS2002? What "auto coord" for?Cheers!

It's not a bug. AUTO COORD OFF is handy if you have rudder pedals.If you don't have rudder pedals - leave both YAW DAMPERS ONDSCVA3339

When you fly on small aircraft, like cessna 152 or172, you will notice that when you enter a turn, the ball is not going to stay in the middle of the 2 vertical line, indicating that the aircraft is centered.If you enter a left turn, you will see the ball falling to the left. right turn, right fall.Aerodynamicaly, what does it mean:Simply, the forces in action make your aircraft not being centered, thus the Rz/Rp is not equal. That implies the raise in the stalling speed.On a 172, if you want to stay centered, on a left turn you will have to apply left rudder to keep the ball centered. Right turn, right rudder.Now, what is the impact of this on big airplain.The bigger and the heavier the bird is the more ruddezr you have to apply.But the biggest concern is the raise in stalling speed.If you loose an engine at take of, you will have asymetric thrust, thus, the bird will tend to put the nose where the dead engine is.Imagine you loose the left engine, the right will give full thrust, the left zero thrust, so the aircraft will tend to enter a left turn. Of course, you do not want to let this happen, you want to fly straight ahead, climg to you HSD at V2, then to the safety altidude at V3, and then do your job, treat the failure, and take the decision to land or for any reason to divert because the weather is not forcely suitable to come back (fog or heavy cross wind).Note, regarding this and V2, the slower the aircraft is going, the more rudder you will have to apply to keep the ball centered.For all multi engine, and more specialy for JAR25 aircraft, there are critical speed:V1, Vr, V2, V3, and always in this order. note you calculate them and plugg them in your FMC.V2 is the speed you will have to maintain to climb ibitialy, and it is only 1.2 stall speed, and protect you for only 15

Stall speed goes up with the square root of the load factor. Thus, for a 60* 2G turn, stall speed is increased 41%. For a 30* turn, it is increased only 7%.1.45 So gives you stall protection to 62*, not 37*.(I'm studying for my PPL and have been going through all this aerodynamic material recently.)Lee Hetherington (KBED)

Hi Lee,You are right, my mistake, of course, the stall speed majoration is 41%.the exact formula is:Nz=1/cos#, where #is bank angle. thus a 60

Hi guys thanks for the help, very elucidative.Unfortunatelly, the rudder in pic/posky merger simply does not work if I leave the yaw dampers on, both right and left have to be in the INOP position in order for the rudder to be effective.Oh well... as long as I know, it has not affected my flight but it's nice to know what this is for.Cheers!

>Unfortunatelly, the rudder in pic/posky merger simply does >not work if I leave the yaw dampers on, both right and left >have to be in the INOP position in order for the rudder to >be effective. Not exactly - you can control this by setting your rudder effectiveness.Search the forum for endless discussions on this - in a nutshell:Boost it to (24?) if you want rudder control with dampers on.Lower it to (4?) if you want rudder control with dampers off only.Search for this one - there is a LOT of material about it.Ian Elchitz CYWG

My version of fs2k2 is in french, so, it will not sound the same, but if you go in the realism parameter, deselect the tur coordinatoe.Then go to fly with PIC, and only if you disconect the 2 yaw damper, only then you will be abble to use your joystick rudder.Cpt Cyrille de Lattre

Hi folks...Ian i tried that, I tweaked literally all parameters regarding rudders and aircraft maneuverability in my aircraft.cfg file, and nothing worked. It's a very weird thing but the fact is that my yaw dampers have to be off for the rudder to work.But back to the Auto Coord... I made three mid-range flights with the auto coord off and I really didn't notice and kind of deviation, navigation problems or any kind of weird behaviour from the aircraft... and I followed all my vnavs and other FMC configs...Well i guess you don't have to turn your dampers off for your rudder to work in a real 767 LOlCheers guys!

Thanks for the wealth of information you provided. I wasn't aware of the 37* max bank restriction.Lee Hetherington (KBED)