I see that too. The condition is nothing special actually. Just fly level and try a left turn. In my case, the nose will first go the right and then the aircraft will start turning left. Almost like the left bank caused a right rudder reaction for a while.
I can't reproduce that. Can you send me the 737.xml file you're using so I can compare it with mine?
It's the one from the 0.9.6 base package. Attached.
I just flew it and I could reproduce it, but not always. My conditions were: - straight flight - 34000 feet of altitude - 290 knots airspeed - mach 0.85
A little left bank was preceeded by a right one.
Also, the vertical speed indicator is not working (and the AP is not working also, but I guess you know that already).
My ~/.fgfsrc is also attached.
--fg-root=/usr/share/FlightGear --control=joystick --enable-game-mode --fog-nicest --enable-random-objects --enable-ai-models
--prop:/environment/params/real-world-weather-fetch=true --prop:/input/joysticks/js[0]/axis[1]/binding/command=property-scale --prop:/input/joysticks/js[0]/axis[1]/binding/property=/controls/flight/elevator --prop:/input/joysticks/js[0]/axis[1]/binding/dead-band=0.02 --prop:/input/joysticks/js[0]/axis[1]/binding/offset=0.0 --prop:/input/joysticks/js[0]/axis[1]/binding/factor=1.0 --prop:/input/joysticks/js[0]/axis[0]/binding/command=property-scale --prop:/input/joysticks/js[0]/axis[0]/binding/property=/controls/flight/aileron --prop:/input/joysticks/js[0]/axis[0]/binding/dead-band=0.02 --prop:/input/joysticks/js[0]/axis[0]/binding/offset=0.0 --prop:/input/joysticks/js[0]/axis[0]/binding/factor=1.0 --prop:/input/joysticks/js[0]/axis[2]/binding/command=property-scale --prop:/input/joysticks/js[0]/axis[2]/binding/property=/controls/flight/rudder --prop:/input/joysticks/js[0]/axis[2]/binding/dead-band=0.9 --prop:/input/joysticks/js[0]/axis[2]/binding/offset=0.0 --prop:/input/joysticks/js[0]/axis[2]/binding/factor=1.0 --prop:/input/joysticks/js[0]/axis[3]/binding/command=property-scale --prop:/input/joysticks/js[0]/axis[3]/binding/property=/controls/engines/engine/throttle --prop:/input/joysticks/js[0]/axis[3]/binding/dead-band=0.02 --prop:/input/joysticks/js[0]/axis[3]/binding/offset=-1.0 --prop:/input/joysticks/js[0]/axis[3]/binding/factor=-0.5 --prop:/input/joysticks/js[0]/button[4]/binding/repeatable=false --prop:/input/joysticks/js[0]/button[4]/binding/command=property-adjust --prop:/input/joysticks/js[0]/button[4]/binding/property=/controls/gear/brake-left --prop:/input/joysticks/js[0]/button[4]/binding/step=1 --prop:/input/joysticks/js[0]/button[7]/binding/repeatable=false --prop:/input/joysticks/js[0]/button[7]/binding/command=property-adjust --prop:/input/joysticks/js[0]/button[7]/binding/property=/controls/gear/brake-right --prop:/input/joysticks/js[0]/button[7]/binding/step=1 --prop:/input/joysticks/js[0]/button[5]/binding/repeatable=false --prop:/input/joysticks/js[0]/button[5]/binding/command=property-adjust --prop:/input/joysticks/js[0]/button[5]/binding/property=/controls/flight/flaps --prop:/input/joysticks/js[0]/button[5]/binding/step=0.34 --prop:/input/joysticks/js[0]/button[6]/binding/repeatable=false --prop:/input/joysticks/js[0]/button[6]/binding/command=property-adjust --prop:/input/joysticks/js[0]/button[6]/binding/property=/controls/flight/flaps --prop:/input/joysticks/js[0]/button[6]/binding/step=-0.34 --prop:/input/joysticks/js[0]/button[2]/binding/repeatable=true --prop:/input/joysticks/js[0]/button[2]/binding/command=property-adjust --prop:/input/joysticks/js[0]/button[2]/binding/property=/controls/flight/elevator-trim --prop:/input/joysticks/js[0]/button[2]/binding/step=0.001 --prop:/input/joysticks/js[0]/button[1]/binding/repeatable=true --prop:/input/joysticks/js[0]/button[1]/binding/command=property-adjust --prop:/input/joysticks/js[0]/button[1]/binding/property=/controls/flight/elevator-trim --prop:/input/joysticks/js[0]/button[1]/binding/step=-0.001
<FDM_CONFIG NAME="737" VERSION="1.65" RELEASE="BETA">
<!--
File: 737.xml
Author: Aero-Matic v 0.7, David Culp
Inputs:
name: 737
type: two-engine transonic transport
max weight: 130000.0 lb
wing span: 94.75 ft
length: 109.6 ft
wing area: 1135 sq-ft
gear type: tricycle
retractable?: yes
# engines: 2
engine type: turbine
engine layout: wings
yaw damper? yes
Outputs:
wing loading: 114.54 lb/sq-ft
CL-alpha: 4.4 per radian
CL-0: 0.2
CL-max: 1.2
CD-0: 0.02
K: 0.043
-->
<METRICS>
AC_WINGAREA 1171.0
AC_WINGSPAN 94.7
AC_CHORD 12.31
AC_HTAILAREA 348.0
AC_HTAILARM 48.04
AC_VTAILAREA 297.00
AC_LV 44.50
AC_IXX 562000.0
AC_IYY 1473000.0
AC_IZZ 1894000.0
AC_IXZ 8000
AC_EMPTYWT 83000
AC_CGLOC 639.0 0.0 -40.0
AC_AERORP 625.0 0.0 24.0
AC_EYEPTLOC 80.0 -30.0 70.0
AC_VRP 600.33 0.0 -35.67
</METRICS>
<UNDERCARRIAGE>
AC_GEAR NOSE_LG 158.0 0.0 -84.0 90000.0 4000.0 0.5 0.8 0.02 STEERABLE NONE 7 RETRACT
AC_GEAR LEFT_MLG 648.0 -100.0 -84.0 120000.0 10000.0 0.5 0.8 0.02 FIXED LEFT 0 RETRACT
AC_GEAR RIGHT_MLG 648.0 100.0 -84.0 120000.0 10000.0 0.5 0.8 0.02 FIXED RIGHT 0 RETRACT
</UNDERCARRIAGE>
<PROPULSION>
<AC_ENGINE FILE="CFM56">
XLOC 540.0
YLOC -193.0
ZLOC -40.0
PITCH 0.0
YAW 0.0
FEED 0
FEED 2
<AC_THRUSTER FILE="direct">
XLOC 540.0
YLOC -193.0
ZLOC -40
PITCH 0.0
YAW 0.0
</AC_THRUSTER>
</AC_ENGINE>
<AC_ENGINE FILE="CFM56">
XLOC 540.0
YLOC 193.0
ZLOC -40
PITCH 0.0
YAW 0.0
FEED 1
FEED 2
<AC_THRUSTER FILE="direct">
XLOC 540.0
YLOC 193.0
ZLOC -40
PITCH 0.0
YAW 0.0
</AC_THRUSTER>
</AC_ENGINE>
<AC_TANK TYPE="FUEL" NUMBER="0"> <!-- left wing -->
XLOC 520.0
YLOC -80.0
ZLOC -18.0
RADIUS 1.0
CAPACITY 10200.0
CONTENTS 10000.0
TEMPERATURE 59.0
</AC_TANK>
<AC_TANK TYPE="FUEL" NUMBER="1"> <!-- right wing -->
XLOC 520.0
YLOC 80.0
ZLOC -18.0
RADIUS 1.0
CAPACITY 10200.0
CONTENTS 10000.0
</AC_TANK>
<AC_TANK TYPE="FUEL" NUMBER="2"> <!-- center -->
XLOC 480.0
YLOC 0.0
ZLOC -18.0
RADIUS 1.0
CAPACITY 15000.0
CONTENTS 4000.0
</AC_TANK>
</PROPULSION>
<FLIGHT_CONTROL NAME="737">
<!-- Pitch ********************************************* -->
<COMPONENT NAME="Pitch Trim Sum" TYPE="SUMMER">
INPUT fcs/elevator-cmd-norm
INPUT fcs/pitch-trim-cmd-norm
CLIPTO -1 1
</COMPONENT>
<COMPONENT NAME="Elevator Control" TYPE="AEROSURFACE_SCALE">
INPUT fcs/pitch-trim-sum
MIN -0.300
MAX 0.300
OUTPUT fcs/elevator-pos-rad
</COMPONENT>
<!-- Roll ********************************************** -->
<COMPONENT NAME="Roll Trim Sum" TYPE="SUMMER">
INPUT fcs/aileron-cmd-norm
INPUT fcs/roll-trim-cmd-norm
CLIPTO -1 1
</COMPONENT>
<COMPONENT NAME="Left Aileron Control" TYPE="AEROSURFACE_SCALE">
INPUT fcs/roll-trim-sum
MIN -0.35
MAX 0.35
OUTPUT fcs/left-aileron-pos-rad
</COMPONENT>
<COMPONENT NAME="Right Aileron Control" TYPE="AEROSURFACE_SCALE">
INPUT -fcs/roll-trim-sum
MIN -0.35
MAX 0.35
OUTPUT fcs/right-aileron-pos-rad
</COMPONENT>
<!-- Yaw *********************************************** -->
<!-- The yaw damper is currently turned off until the -->
<!-- autopilot is tuned. -->
<COMPONENT NAME="Rudder Command Sum" TYPE="SUMMER">
INPUT fcs/rudder-cmd-norm
INPUT fcs/yaw-trim-cmd-norm
CLIPTO -1 1
</COMPONENT>
<COMPONENT NAME="Yaw Damper" TYPE="SCHEDULED_GAIN">
INPUT velocities/r-aero-rad_sec
SCHEDULED_BY velocities/vc-kts
ROWS 2
30.00 0.00
60.00 2.00
</COMPONENT>
<COMPONENT NAME="Yaw Damper Final" TYPE="SCHEDULED_GAIN">
INPUT fcs/yaw-damper
SCHEDULED_BY velocities/vc-kts
ROWS 2
30.0 0.0
60.0 0.0
</COMPONENT>
<COMPONENT NAME="Rudder Sum" TYPE="SUMMER">
INPUT fcs/rudder-command-sum
INPUT fcs/yaw-damper-final
CLIPTO -1 1
</COMPONENT>
<COMPONENT NAME="Rudder Control" TYPE="AEROSURFACE_SCALE">
INPUT fcs/rudder-sum
MIN -0.35
MAX 0.35
OUTPUT fcs/rudder-pos-rad
</COMPONENT>
<COMPONENT NAME="Flaps Control" TYPE="KINEMAT">
INPUT fcs/flap-cmd-norm
DETENTS 9
0 0
0.125 5
0.250 4
0.375 3
0.500 2
0.625 2
0.750 2
0.875 2
1.000 2
OUTPUT fcs/flap-pos-deg
</COMPONENT>
<COMPONENT NAME="Gear Control" TYPE="KINEMAT">
INPUT gear/gear-cmd-norm
DETENTS 2
0 0
1 5
OUTPUT gear/gear-pos-norm
</COMPONENT>
<COMPONENT NAME="Speedbrake Control" TYPE="KINEMAT">
INPUT fcs/speedbrake-cmd-norm
DETENTS 2
0 0
1 0.6
OUTPUT fcs/speedbrake-pos-norm
</COMPONENT>
</FLIGHT_CONTROL>
<AERODYNAMICS>
<AXIS NAME="LIFT">
<COEFFICIENT NAME="CLalpha" TYPE="VECTOR">
Lift_due_to_alpha
4
aero/alpha-rad
aero/qbar-psf|metrics/Sw-sqft
-0.20 -0.680
0.00 0.200
0.23 1.200
0.60 0.600
</COEFFICIENT>
<COEFFICIENT NAME="dCLflap" TYPE="VALUE">
Delta_Lift_due_to_flaps
aero/qbar-psf|metrics/Sw-sqft|fcs/components/flaps-control/output-norm
0.9
</COEFFICIENT>
<COEFFICIENT NAME="dCLsb" TYPE="VALUE">
Delta_Lift_due_to_speedbrake
aero/qbar-psf|metrics/Sw-sqft|fcs/speedbrake-pos-norm
-0.1
</COEFFICIENT>
<COEFFICIENT NAME="CLde" TYPE="VALUE">
Lift_due_to_Elevator_Deflection
aero/qbar-psf|metrics/Sw-sqft|fcs/elevator-pos-rad
0.2
</COEFFICIENT>
</AXIS>
<AXIS NAME="DRAG">
<COEFFICIENT NAME="CD0" TYPE="VECTOR">
Drag_at_zero_lift
5
aero/alpha-rad
aero/qbar-psf|metrics/Sw-sqft
-1.57 1.500
-0.26 0.042
0.00 0.021
0.26 0.042
1.57 1.500
</COEFFICIENT>
<COEFFICIENT NAME="CDi" TYPE="VALUE">
Induced_drag
aero/qbar-psf|metrics/Sw-sqft|aero/cl-squared-norm
0.043
</COEFFICIENT>
<COEFFICIENT NAME="CDmach" TYPE="VECTOR">
Drag_due_to_mach
4
velocities/mach-norm
aero/qbar-psf|metrics/Sw-sqft
0.0 0.000
0.79 0.000
1.1 0.023
1.8 0.015
</COEFFICIENT>
<COEFFICIENT NAME="CDflap" TYPE="VALUE">
Drag_due_to_flaps
aero/qbar-psf|metrics/Sw-sqft|fcs/components/flaps-control/output-norm
0.059
</COEFFICIENT>
<COEFFICIENT NAME="CDgear" TYPE="VALUE">
Drag_due_to_gear
aero/qbar-psf|metrics/Sw-sqft|gear/gear-pos-norm
0.015
</COEFFICIENT>
<COEFFICIENT NAME="CDsb" TYPE="VALUE">
Drag_due_to_speedbrakes
aero/qbar-psf|metrics/Sw-sqft|fcs/speedbrake-pos-norm
0.02
</COEFFICIENT>
<COEFFICIENT NAME="CDbeta" TYPE="VECTOR">
Drag_due_to_sideslip
5
aero/beta-rad
aero/qbar-psf|metrics/Sw-sqft
-1.57 1.230
-0.26 0.050
0.00 0.00
0.26 0.050
1.57 1.230
</COEFFICIENT>
<COEFFICIENT NAME="CDde" TYPE="VALUE">
Drag_due_to_Elevator_Deflection
aero/qbar-psf|metrics/Sw-sqft|fcs/elevator-pos-norm
0.059
</COEFFICIENT>
</AXIS>
<AXIS NAME="SIDE">
<COEFFICIENT NAME="CYb" TYPE="VALUE">
Side_force_due_to_beta
aero/qbar-psf|metrics/Sw-sqft|aero/beta-rad
-1
</COEFFICIENT>
</AXIS>
<AXIS NAME="ROLL">
<COEFFICIENT NAME="Clb" TYPE="VALUE">
Roll_moment_due_to_beta
aero/qbar-psf|metrics/Sw-sqft|metrics/bw-ft|aero/beta-rad
-0.09
</COEFFICIENT>
<COEFFICIENT NAME="Clp" TYPE="VALUE">
Roll_moment_due_to_roll_rate
aero/qbar-psf|metrics/Sw-sqft|metrics/bw-ft|aero/bi2vel|velocities/p-aero-rad_sec
-0.4
</COEFFICIENT>
<COEFFICIENT NAME="Clr" TYPE="VALUE">
Roll_moment_due_to_yaw_rate
aero/qbar-psf|metrics/Sw-sqft|metrics/bw-ft|aero/bi2vel|velocities/r-aero-rad_sec
0.09
</COEFFICIENT>
<COEFFICIENT NAME="Clda" TYPE="VECTOR">
Roll_moment_due_to_aileron
2
velocities/mach-norm
aero/qbar-psf|metrics/Sw-sqft|metrics/bw-ft|fcs/left-aileron-pos-rad
0.0 0.1
2.0 0.033
</COEFFICIENT>
<COEFFICIENT NAME="Cldr" TYPE="VALUE">
Roll_moment_due_to_rudder
aero/qbar-psf|metrics/Sw-sqft|metrics/bw-ft|fcs/rudder-pos-rad
0.01
</COEFFICIENT>
</AXIS>
<AXIS NAME="PITCH">
<COEFFICIENT NAME="Cmalpha" TYPE="VALUE">
Pitch_moment_due_to_alpha
aero/qbar-psf|metrics/Sw-sqft|metrics/cbarw-ft|aero/alpha-rad
-0.6
</COEFFICIENT>
<COEFFICIENT NAME="Cmde" TYPE="VECTOR">
Pitch_moment_due_to_elevator
2
velocities/mach-norm
aero/qbar-psf|metrics/Sw-sqft|metrics/cbarw-ft|fcs/elevator-pos-rad
0.0 -1.2
2.0 -0.300
</COEFFICIENT>
<COEFFICIENT NAME="Cmq" TYPE="VALUE">
Pitch_moment_due_to_pitch_rate
aero/qbar-psf|metrics/Sw-sqft|metrics/cbarw-ft|aero/ci2vel|velocities/q-aero-rad_sec
-27
</COEFFICIENT>
<COEFFICIENT NAME="Cmadot" TYPE="VALUE">
Pitch_moment_due_to_alpha_rate
aero/qbar-psf|metrics/Sw-sqft|metrics/cbarw-ft|aero/ci2vel|aero/alphadot-rad_sec
-16
</COEFFICIENT>
</AXIS>
<AXIS NAME="YAW">
<COEFFICIENT NAME="Cnb" TYPE="VALUE">
Yaw_moment_due_to_beta
aero/qbar-psf|metrics/Sw-sqft|metrics/bw-ft|aero/beta-rad
0.26
</COEFFICIENT>
<COEFFICIENT NAME="Cnr" TYPE="VALUE">
Yaw_moment_due_to_yaw_rate
aero/qbar-psf|metrics/Sw-sqft|metrics/bw-ft|aero/bi2vel|velocities/r-aero-rad_sec
-0.35
</COEFFICIENT>
<COEFFICIENT NAME="Cndr" TYPE="VALUE">
Yaw_moment_due_to_rudder
aero/qbar-psf|metrics/Sw-sqft|metrics/bw-ft|fcs/rudder-pos-rad
-0.2
</COEFFICIENT>
<COEFFICIENT NAME="Cnda" TYPE="VALUE">
Adverse_yaw
aero/qbar-psf|metrics/Sw-sqft|metrics/bw-ft|fcs/left-aileron-pos-rad
0
</COEFFICIENT>
</AXIS>
</AERODYNAMICS>
</FDM_CONFIG>
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