Question Please

[anarki]

Hi everyone , what does Yaw Damper really do? , It seem it looks the Rudder in the tail but why and for what .

Lou.

[ashaman]

Very shortly, because I don't really know the mechanics of it but only its effects, Yaw Damper nulls the passive aerodynamic effect called "dutch roll" in planes with swept wings (like all the jets and some turboprops), so the passengers on board have to use the barf bags more rarely. It works at the same time as a real life auto-coordinator, because the YD circuit dampers the dutch roll using the rudder, so when it's on the pedals are disabled.

PS
I speak about real planes, because as far as I know no FS plane, default nor add-on, free nor pay, has ever had the dutch roll effect included in its dynamics.

[Hagar]

This might explain it. http://en.wikipedia.org/wiki/Dutch_roll

Basically the yaw damper automatically compensates for inherent instability characteristics known as "Dutch Roll". This is more common on low swept-wing aircraft like most modern airliners.

[anarki]

Very shortly, because I don't really know the mechanics of it but only its effects, Yaw Damper nulls the passive aerodynamic effect called "dutch roll" in planes with swept wings (like all the jets and some turboprops), so the passengers on board have to use the barf bags more rarely. It works at the same time as a real life auto-coordinator, because the YD circuit dampers the dutch roll using the rudder, so when it's on the pedals are disabled.

PS
I speak about real planes, because as far as I know no FS plane, default nor add-on, free nor pay, has ever had the dutch roll effect included in its dynamics.

That's why

[alrot]

I don't even get to know ever what's that for, but I found interesting there isn't in FS9 dynamics ,I hope there is Yaw damper (Real) in FSX..

[vololiberista]

Tis one of the reasons why you should never hand fly a swept wing a/c at altitude.
To see it in FS9 take an a/c to altitude and then to VNE. disconnect the yaw damper and you should see occilations.
Some a/c like the  707 had a tendency to increase occilations leading to termination of flight!!!!!
Vololiberista

[alrot]

PS
I speak about real planes, because as far as I know no FS plane, default nor add-on, free nor pay, has ever had the dutch roll effect included in its dynamics.

Who's is right? I ain't got a real plane (just for the record) Does it work as real life in FS9 or are not included in its fly dynamics?

Tis one of the reasons why you should never hand fly a swept wing a/c at altitude.
To see it in FS9 take an a/c to altitude and then to VNE. disconnect the yaw damper and you should see occilations.
Some a/c like the  707 had a tendency to increase occilations leading to termination of flight!!!!!
Vololiberista

[ashaman]

I can't honestly tell one instance of me handling a plane in FS9 where the dutch roll was modeled, and I've tried.

For real.

Of course I've never tried to hand-fly a plane at altitude at Vne. Then again the dutch roll is not supposed to happen in that condition only and exclusively.

Add to that that a YD circuit (circuits actually, in every liners there are 2, both operative at the same time) is not autopilot dependent, but can be kept operative even when hand flying, and you have quite the picture.

Though I still stand my ground. Never happened to me even when for a reason or another I've flown with the YD off. If someone can direct me toward a simulated liner (free) that models dutch roll, I'd be happy. It'd be quite the refreshing experience.

[vololiberista]

I can't honestly tell one instance of me handling a plane in FS9 where the dutch roll was modeled, and I've tried.

For real.

Of course I've never tried to hand-fly a plane at altitude at Vne. Then again the dutch roll is not supposed to happen in that condition only and exclusively.

Add to that that a YD circuit (circuits actually, in every liners there are 2, both operative at the same time) is not autopilot dependent, but can be kept operative even when hand flying, and you have quite the picture.

Though I still stand my ground. Never happened to me even when for a reason or another I've flown with the YD off. If someone can direct me toward a simulated liner (free) that models dutch roll, I'd be happy. It'd be quite the refreshing experience.

The VC10 in fact displays significant Dutch roll in FS9 and in real life. But one has to take it to substantially above VNE.
The VC10 is very clean aerodynamically and at high altitude there is much less aerodynamic damping thus increasing the risk of divergent Dutch roll. The VC10 has an enormous tail and fin which more than compensate for any tendency for Dutch roll. The a/c can fly perfectly comfortably up to and a little above VNE (mach 0.94) but at mach 0.96 the yaw dampers begin to overload and cannot contain the yaw tendency. This is modelled very well in fact in FS9
Vololiberista