Project Airbus – Talk

I just downloaded the Qantas A380 and was encountering weird altitude hold problems.

I had a look at the aicraft.cfg file for the A380 and compared it to the B747.

A380:
[autopilot]
autopilot_available = 1
flight_director_available = 1
default_vertical_speed = 0
autothrottle_available = 1
autothrottle_arming_required = 1
autothrottle_max_rpm = 90
autothrottle_takeoff_ga = 1
pitch_takeoff_ga = 8
max_pitch = 10.0
max_pitch_acceleration = 1.0
max_pitch_velocity_lo_alt = 2.0
max_pitch_velocity_hi_alt = 1.5
max_pitch_velocity_lo_alt_breakpoint = 20000.0
max_pitch_velocity_hi_alt_breakpoint = 28000.0
max_bank = 25.0
max_bank_acceleration = 1.8
max_bank_velocity = 3.00
max_throttle_rate = 0.20
nav_proportional_control = 16.00
nav_integrator_control = 0.17
nav_derivative_control = 0.00
nav_integrator_boundary = 2.50
nav_derivative_boundary = 0.00
gs_proportional_control = 18.0
gs_integrator_control = 0.33
gs_derivative_control = 0.00
gs_integrator_boundary = 0.70
gs_derivative_boundary = 0.00
yaw_damper_gain = 1.0

747
[autopilot]
autopilot_available = 1
flight_director_available = 1
default_vertical_speed = 1800.0
autothrottle_available = 1
autothrottle_arming_required = 1
autothrottle_max_rpm = 99
autothrottle_takeoff_ga = 1
pitch_takeoff_ga = 8;
max_pitch=10.0
max_pitch_acceleration=1.0
max_pitch_velocity_lo_alt=2.0
max_pitch_velocity_hi_alt=1.5
max_pitch_velocity_lo_alt_breakpoint=20000.0
max_pitch_velocity_hi_alt_breakpoint=28000.0
max_bank=25.0
max_bank_acceleration=1.8
max_bank_velocity=3.00
max_throttle_rate=0.05
nav_proportional_control=16.00
nav_integrator_control=0.17
nav_derivative_control=0.00
nav_integrator_boundary=2.50
nav_derivative_boundary=0.00
gs_proportional_control = 18.0
gs_integrator_control = 0.33
gs_derivative_control = 0.00
gs_integrator_boundary = 0.70
gs_derivative_boundary = 0.00
yaw_damper_gain = 1.0

I therefore changed the value from 0 to 1800 on the A380 and it worked perfectly. No more altitude hold problems.

Could this be confirmed/fixed for next version?

Never had alt hold problems here, can't fix/confirm something I can't replicate, but if this works for you (and possibly other people), then cool.

Rather doubt there'll be a next version

I had the same problem too a while back and I did what Mage25 and now the altitude holds.

Good to hear.

Now, can someone delete my account as this issue has been resolved/reported.