investigating Aileron-rudder interconnect

[Fox One]

As is known, at the AOA where the leading edge flaps are lowered, the differential stabilator is switched off. Above 18 deg AOA the aileron deflection angle starts to decrease and at max AOA it is only +/-5 deg.

So at max AOA the only control surfaces generating roll is +/-5 deg ailerons. The result – at high AOA you move the stick laterally and nothing happens.

 

Of course, the real aircraft has aileron-rudder interconnect. See attached pages from flight manual. How could an aircraft of this kind NOT have aileron-rudder interconnect? Even the MiG-23 has an implementation of lateral stick-to-rudder interconnect.

 

The ARM-150 actuator in the rudder channel has an authority of +/-8 deg. I’m curious what the developers think this +/-8 deg is “reserved” for. At any stick input, no matter the AOA, the automatics in the rudder channel do nothing to help you. The rudders don’t deflect at all; they just sit there dead. The only way you can “convince” the automatics in the rudder channel to show you they’re not dead is to press a rudder pedal fully, then release it. The quite substantial yaw rate generated the rudders will try to counter by an anemic 1 deg or so deflection.

 

 

[BIGNEWY]

Hi, 

I have edited your post to remove the attached documents, please send them via PM as I am not sure if they break our 1.16 forum rule. 

thank you 

[AeriaGloria]

37 minutes ago, Fox One said:

As is known, at the AOA where the leading edge flaps are lowered, the differential stabilator is switched off. Above 18 deg AOA the aileron deflection angle starts to decrease and at max AOA it is only +/-5 deg.

So at max AOA the only control surfaces generating roll is +/-5 deg ailerons. The result – at high AOA you move the stick laterally and nothing happens.

 

Of course, the real aircraft has aileron-rudder interconnect. See attached pages from flight manual. How could an aircraft of this kind NOT have aileron-rudder interconnect? Even the MiG-23 has an implementation of lateral stick-to-rudder interconnect.

 

The ARM-150 actuator in the rudder channel has an authority of +/-8 deg. I’m curious what the developers think this +/-8 deg is “reserved” for. At any stick input, no matter the AOA, the automatics in the rudder channel do nothing to help you. The rudders don’t deflect at all; they just sit there dead. The only way you can “convince” the automatics in the rudder channel to show you they’re not dead is to press a rudder pedal fully, then release it. The quite substantial yaw rate generated the rudders will try to counter by an anemic 1 deg or so deflection.

 

 

I am confused. You mention you know differential stabilator is shut off with lowered LEF then mention that they are only roll? They are not, above 24 degrees you still have +/-5 degree aileron deflection. 
 

Yes the aileron rudder crossover should be modeled for high AOA. 
 

Understand that any “ARM-150” actuator is reserved for dampener system as they are the fastest actuators available. For example stabilizer ARM-150 has 3 degrees authority. The aileron-rudder crossover box is simply high jacking this actuator to reduce adverse yaw/roll reversal, which is the reason it was added in order to make MiG-29 safe to fly at such high AOA.