Can anyone on the Dev Team please help with AI.CFG Parameters ? How do we
adjust Rotate speed, climb params, approach speed etc etc PLEASE
BUMP PLEASE ? Need to know How to change Rotation speed/Initial climb rate etc
etc
Hello @ModelMuncher You might want to have a
look at the REFERENCE_SPEEDS section of the flight_model.cfg for this.
https://docs.flightsimulator.com/html/Content_Configuration/SimObjects/Aircraft_SimO/Flight_Model_Definition.htm#h2
Regards, Sylvain
Hi Silvain … Yes I have looked and adjusted these params but for example…
although the Ai rotation starts at 60 Kts its PAINFULLY Slow and results in an
initial climb speed of 1 or 200 FPM 
Conversely the Ai pilot seems to be
taking no notice of the described “Approach speed” dropping the speed into
dangerous near stall conditions Additionally … the use of testing various
ai.cfgs from default aircraft results in a confusing mix of No rotation …
crazy nosedives etc etc leading me to believe there is Much more involved than
the “reference speeds” section you mention
Can you show us your ai.cfg and REFERENCE_SPEEDS settings please so dev can
try to find an explanation. Regards, Sylvain
Please see attached Zip containing both flight model and ai cfgs if you look
at approach speed for example it is defined as 100 Kts approach_speed=100 so
why would the Ai Pilot insist on reducing to 60 and dropping like a stone?
Also, The climb speed is defined as 80 Kts climb_speed =80 And again the Ai
insists on accelerating to above 100 - 120 on some occasions Finally I have
noticed that your Ai Pilot has no concept of Prop Levers … reducing Throttles
alone is No way to operate a Variable Pitch Engine Hope you can help Graham
FLIGHT_MODEL.zip
Out of curiosity, are the flaps correctly set up when your aircraft is in
approach mode?
Ai Sets flap 1 well before entering downwind leg and I have Never seen Full
flap deployed … even on final One further Issue that has become apparent is
that on an ILS Approach using Autopilot … the Aircraft will be WELL Below the
GS every time …
Bumping again … I supplied details requested … anyone still in here ?
Hello @ModelMuncher Some follow up on this: - The approach_speed
parameter seems to not be considered. AI is aiming for 1.3 x Vs0, Vs0 being
the speed provided by full_flaps_stall_speed. I am investigating why this
parameter has no influence. - The flaps position depends on the context. If
you select just an arrival in the world map, the flight will load using the
Final.flt file and flaps will be fully extended (on Asobo aircraft at least).
If you start in the middle of the flight and have the AI do the full landing
pattern, it will only use 1 level of flaps. I’m also investigating this as we
could expect the AI to set full flaps at some point. (Can you run an approach
flight just by selecting an arrival and tell us if the AI stalls in that
situation too?) - Can you run an AI approach with the Aircraft Editor’s
Debug Aircraft Tracking tool opened and tell us what the Simulated Stall
Speed value is showing when your aircraft stalls? This is the effective
stall speed of your aircraft. If its effective stall speed is higher than the
one you provide in the REFERENCE SPEEDS section, this can lead to stall
(if we ignore the issue of AI not using the full flaps range) - Can you
provide us with your full package? I’ve been running tests with the G36 for
comparison but we can help more by running tests with your package. Note: As a
proposition to fix the problem quickly on your side, raising your
full_flaps_stall_speed **** will have the AI use a higher approach speed
and prevent the stall. You’ll be able to come back to more appropriate
settings when we have identified and solved the issues I mentioned above. I
hope this helps. Regards, Sylvain
Here are some details that may help the investigation … It would be difficult
to send the full package at this time as it is still very much in production
… But perhaps if I send the cfg files you can apply these to another visual
model ? However please see the attached screenshots and I hope they can shed
some light on this Regards… and Thanks ! Graham This first shot is Prior to
entering the circuit … Ai Approach HAS BEEN Selected but He/she seems to want
to fly past a little further before complying 
The Engine output is quite
worrying also
the downwind leg the Ai wants to immediately drop the power and flaps …
Neither of these things should happen until on final … My approach speed is
set at 100 Kts in the flight model config…
[REFERENCE SPEEDS]
full_flaps_stall_speed =49.966 flaps_up_stall_speed =60.828 cruise_speed
=150.3 max_indicated_speed =180.00 max_flaps_extended =100
normal_operating_speed =131 airspeed_indicator_max =203 rotation_speed_min =50
climb_speed =80 cruise_alt =8000 takeoff_speed =55 spawn_cruise_altitude =8500
spawn_descent_altitude=1500 best_angle_climb_speed=79.9558 approach_speed=100
best_glide=95 best_single_engine_rate_of_climb_speed=92
minimum_control_speed=50.40 max_mach=0 max_gear_extended=0 cruise_mach=0
crossover_speed=0 fly_assistant_use_dynamic_speeds=0
@ModelMuncher As I mentioned before, I was able to confirm certain
discrepancies in the way the AI behave and is configured. But from the info
you provided here there is also an issue on your side. Your reference speed
section shows a flaps_up_stall_speed of 61 knots, yet your aircraft is
stalling at 70.2 (“Simulated” is the one you want to look for) with 1 level of
flaps. Either your reference speeds are too low or your flight model is wrong
and your aircraft is stalling too early. Regarding the engine output, you must
have a problem in the way your propellers are configured, there shouldn’t be
so much difference between engine and propeller power.
Sorry … Im confused here You say “Your reference speed section shows a
flaps_up_stall_speed of 61 knots, yet your aircraft is stalling at 70.2
(“Simulated” is the one you want to look for) with 1 level of flaps.” so is it
FLAPS UP STALL SPEED or FLAP 1 STALL SPEED “With 1 level of flaps” ? And My
Props are configures the same way the rest of the aircraft in the store are
AFAIK can you offer anything in the way of a clue ? Finally my reference
speed for “APPROACH” Is clearly set at 100 Kts Well above any stall speed…
estimated , simulated or expected
- " so is it FLAPS UP STALL SPEED or FLAP 1 STALL SPEED “With 1 level of
flaps” ?" There is no such thing as flap_1_stall_speed… I’m just saying
that your aircraft with 1 level of flaps should not stall at a higher speed
than what you provide as flaps_up_stall_speed. If it does, either the value
you provide is wrong or the FM is not correctly configured. - " Finally my
reference speed for “APPROACH” Is clearly set at 100 Kts Well above any
stall speed… estimated , simulated or expected " As I stated before, this
parameter is not taken into account at the moment so just ignore it. (Devs
will have a look at this bug) Your actual approach speed will be 1.3xVs0. -
" And My Props are configures the same way the rest of the aircraft in the
store are AFAIK can you offer anything in the way of a clue ? " There can
be many reasons for this; angle, diameter, efficiency… can’t really tell.
Regards, Sylvain
I would like to take advantage of this question to ask how the LOWEST
SELECTABLE SPEED is calculated, and how it can be modified. Thank you.
@boufogre @ModelMuncher Simulated stall speed: computed from the sum of
all lift forces the aircraft can produce in its current configuration (weight,
gear landing), taking all control surfaces into account. That’s the real stall
speed of the FM. Estimated stall speed: computed from the values
provided in the REFERENCE SPEEDS section, taking only flaps position and
weight into account. So basically an interpolation based on POH values you
provided Lowest selectable speed: Set to 1.23 x Estimated Stall
Speed