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Posted

Hello,

 

Rudder deflection during horizontal flight does not cause any kind of roll coupling, giving rudder inputs a very unrealistic feel.

 

https://books.google.es/books?id=GB1Cdqf433wC&pg=PA50&lpg=PA50&dq=yaw+roll+coupling&source=bl&ots=yg9cPNJgoH&sig=u9VTxRqZ4RWsYZsImXrJtGxJcMU&hl=en&sa=X&ved=0ahUKEwiD8N-Zy5PYAhXEtRQKHQ_nCcUQ6AEIYDAK#v=onepage&q=yaw%20roll%20coupling&f=false

 

Any conventional aircraft is supposed to exhibit such behavior, the Harrier being no exception.

Posted
No stability augmentation system will remove a basic (and desired) aircraft handling characteristic... :doh:

 

Not true, it most certainly can, if you have a gyro or pilot feeding in a yaw signal to a FBW system for example, any coupling that resultant movement causes on the roll axis can be automatically compensated for by the roll gyro, and you'd never even know it was happening.

 

But it does depend on how the system is set up, or what mode it's in.

 

If designed to you could have a plane that exhibits absolutely no roll cross coupling, or if you really wanted to the opposite.

Posted
Not true, it most certainly can, if you have a gyro or pilot feeding in a yaw signal to a FBW system for example, any coupling that resultant movement causes on the roll axis can be automatically compensated for by the roll gyro, and you'd never even know it was happening.

 

But it does depend on how the system is set up, or what mode it's in.

 

If designed to you could have a plane that exhibits absolutely no roll cross coupling, or if you really wanted to the opposite.

 

SAS and FBW don't work in the same way. But anyway, try any system you want at a high enough AoA and you will see what happens... basic aerodynamic design features will manifest no matter what, unlike in the DCS Harrier with or without SAAHS.

 

In any case, this thread is addressed to RAZBAM to report what I'm sure is a flight modeling bug based on many thousand hours of flying experience. Now it is up to RAZBAM to investigate and, if/when confirmed, get it fixed, like other devs teams have always done in the past.

 

Basic handling info can be found in A1-AV8BB--NFM--000 "11.8 SEMI--JETBORNE/JETBORNE FLIGHT CHARACTERISTICS"

 

Seeing that it takes nowhere, I wont be engaging in further cluttering this thread.

 

Thanks all

Posted

Where did the high AoA suddenly come into it from?

 

This is about whether a system allows a roll input to be exhibited from a yaw input, and not all systems do and SAS and FBW may not function in the same way, but they do have similar characteristics, in that they will both artificially increase the stability of an aircraft, and depending on the control gains they can make a borderline unflyable aircraft safe to operate.

Posted

AV8B-NFM-500 p.53 PROHIBITED MANEUVERS (ALL AIRCRAFT)

 

19. Rudder deflection above 0.80 Mach.

 

Above 0.80M is about 90% of my flight envelope. The remaining 10% being departure and approach. SAAHS takes care of rudder usage.

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