autopilot Ap913

I downloaded B52 from b-52g_rrv_jt.zip. It was all ok except autopilot. The HDG and ALT hold are working ok, but the speed hold no. For experiment, I applied this autopilot to the default Lear 45 and was all ok: so I think the behaviour depends on some parameter, perhaps in aircraft.cfg. Can someone clarify this to me? (Please, excuse my poor English, but I hope you understand my problem)

Thank for replies, giorda 35

Getting autopilots to work (well) is usually pretty tough.

I managed to get some to work, but never to work well. I must say I didn't pursue it very far, so you may have more success.

 

I found a lot in these sections is required. Which ones specifically I can't say.

This is from the b737-800 orig aircraft.cfg file.

Compare to your plane, and see what's missing.

Some of it may have to be in the air file as weel (not sure, didn't edit those much).

Or, even worse, must be in the model, in which case you can't change it.

But I think for most of it having it the aircraft.cfg file is enough.

 

 

In the autopilot sections it's stuff like this:

[autopilot]

autopilot_available=1

flight_director_available=1

default_vertical_speed=1800

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=30

max_bank_acceleration=1.8

max_bank_velocity=3.00

max_throttle_rate=0.10

nav_proportional_control=12.00

nav_integrator_control=0.25

nav_derivative_control=0.00

nav_integrator_boundary=2.50

nav_derivative_boundary=0.00

gs_proportional_control=25.0

gs_integrator_control=0.53

gs_derivative_control=0.00

gs_integrator_boundary=0.70

gs_derivative_boundary=0.00

yaw_damper_gain = 1.0

 

And perhaps also in 'airplane geometry' things like this:

[airplane_geometry]

elevator_area = 70.5 //Square feet

aileron_area = 26.9 //Square feet

rudder_area = 56.2 //Square feet

elevator_up_limit = 22.5 //Degrees

elevator_down_limit = 19.5 //Degrees

aileron_up_limit = 20.0 //Degrees

aileron_down_limit = 20.0 //Degrees

rudder_limit = 26.0 //Degrees

elevator_trim_limit = 20.0 //Degrees

spoiler_limit = 60.0 //Degrees

spoiler_extension_time = 2.0 //Seconds

spoilerons_available = 1 //Spoilerons Available?

aileron_to_spoileron_gain = 3 //Aileron to spoileron gain

min_ailerons_for_spoilerons = 10 //Degrees

min_flaps_for_spoilerons = 0 //Minimum flap handle position when spoilerons activate

auto_spoiler_available = 1

positive_g_limit_flaps_up = 4.0 //Design G load tolerance (positive, flaps up)

positive_g_limit_flaps_down= 3.0 //Design G load tolerance (positive, flaps down)

negative_g_limit_flaps_up = -3.0 //Design G load tolerance (negative, flaps up)

negative_g_limit_flaps_down= -2.0 //Design G load tolerance (negative, flaps down)

load_safety_factor = 1.5 //Design G load safety factor

 

 

Maybe also things in the [flight_tuning] section need to be present.

I found the autopilot to work perfectly in this B-52. Altitude, heading and speed hold all worked fine! Altitude 12,000 Heading 230 and Speed 250Knots indicated.

 

Sorry for retard. I foundo two different autopilots in B52. One is working very well, the other no. It work well with altitude and HDG, not for speed.

Thanls for your interest, I shall test what you suggest. giorda35

I think if one autopilot does work, the aircraft.cfg file is probably fine.