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Forum: Tech Log

4th Jan 2013, 20:45

Replies: 61

Airbus hand-flying characteristics

Views: 25,536

Posted By HazelNuts39

Hi Stuck iaA, That is my understanding too....

Hi Stuck iaA,

That is my understanding too. But it is perhaps not the whole story. Some PPRuNers will recall my failed attempt to derive the C* coefficients from the FDR data of AF447.

What...

Forum: Tech Log

4th Jan 2013, 19:06

Replies: 61

Airbus hand-flying characteristics

Views: 25,536

Posted By HazelNuts39

As I understand it (until I get a better...

As I understand it (until I get a better explanation):
Output is a signal to the actuator to move the elevator up or down
Function of - is the gain"
Input is delta (C*) , i.e. the difference...

Forum: Tech Log

4th Jan 2013, 18:01

Replies: 61

Airbus hand-flying characteristics

Views: 25,536

Posted By HazelNuts39

Hi Stuck, What can I add to C* = n + A*q ?...

Hi Stuck,

What can I add to C* = n + A*q ? It represents a 'blend' of G-load and pitch rate that is fed into the control loop to command the position of the elevator.

Forum: Tech Log

4th Jan 2013, 17:16

Replies: 61

Airbus hand-flying characteristics

Views: 25,536

Posted By HazelNuts39

Hi Microburst2002, Like you, I don't know...

Hi Microburst2002,

Like you, I don't know exactly how the "blending" works. I'm just piecing together various bits of information that have been posted or linked in various threads on this forum....

Forum: Tech Log

4th Jan 2013, 09:30

Replies: 61

Airbus hand-flying characteristics

Views: 25,536

Posted By HazelNuts39

@Microburst2002: The blend of pitch rate and...

@Microburst2002:

The blend of pitch rate and G load is determined by the constant factor of the pitch rate term in the C* feed back parameter. It does not require a speed input.

The airplane...

Forum: Tech Log

3rd Jan 2013, 08:42

Replies: 61

Airbus hand-flying characteristics

Views: 25,536

Posted By HazelNuts39

C* blend of pitch rate and g-load

That is correct for the steady-state constant "g" that is eventually achieved. AIUI the 'blending' of G-Load and Pitch rate refers to the way the flight control computer controls the transition from...

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