1) It increases the fuel load to nearly full internal fuel -- the current default load-up only has 100 lbs of fuel onboard and thus runs out of gas after less than a minute of flight time. Max internal fuel capacity was updated based on data obtained from the globalsecurity.org web site.
2) The outputs from the pitch damper, roll damper, and yaw damper FCS components defined in the XML config file are summed with the pilot commands on each axis, so the dampers actually contribute to the final control surface positioning (they didn't do anything previously). This greatly improves the f15 model's "flyability", if that's a word.
I have dreams of someday trying to implement a reasonably accurate model of the F-15's FCS, using information available on Gene Buckle's web site, http://www.f15sim.com (look in the "Operation" section), and from some NASA reports. If somebody is already working on this, I'd be interested in helping.
Thanks, -Eric
*** f15.xml_ORIG Mon Jun 21 21:19:51 2004
--- f15.xml Mon Sep 20 22:17:37 2004
***************
*** 112,119 ****
YLOC 0.0
ZLOC 4.5
RADIUS 29.0
! CAPACITY 185.0
! CONTENTS 100.0
</AC_TANK>
<AC_TANK TYPE="FUEL" NUMBER="1">
--- 112,119 ----
YLOC 0.0
ZLOC 4.5
RADIUS 29.0
! CAPACITY 6561.5
! CONTENTS 6500.0
</AC_TANK>
<AC_TANK TYPE="FUEL" NUMBER="1">
***************
*** 121,128 ****
YLOC 0.0
ZLOC 4.5
RADIUS 29.0
! CAPACITY 185.0
! CONTENTS 100.0
</AC_TANK>
</PROPULSION>
--- 121,128 ----
YLOC 0.0
ZLOC 4.5
RADIUS 29.0
! CAPACITY 6561.5
! CONTENTS 6500.0
</AC_TANK>
</PROPULSION>
***************
*** 130,144 ****
<FLIGHT_CONTROL NAME="f15">
<COMPONENT NAME="Pitch Trim Sum" TYPE="SUMMER">
INPUT fcs/elevator-cmd-norm
INPUT fcs/pitch-trim-cmd-norm
CLIPTO -1 1
</COMPONENT>
- <COMPONENT NAME="Pitch Damper Gain" TYPE="PURE_GAIN">
- INPUT velocities/q-rad_sec
- GAIN 0.000698
- </COMPONENT>
<COMPONENT NAME="Elevator Control" TYPE="AEROSURFACE_SCALE">
INPUT fcs/pitch-trim-sum
MIN -26
--- 130,145 ----
<FLIGHT_CONTROL NAME="f15">
+ <COMPONENT NAME="Pitch Damper Gain" TYPE="PURE_GAIN">
+ INPUT velocities/q-rad_sec
+ GAIN 0.000698
+ </COMPONENT>
<COMPONENT NAME="Pitch Trim Sum" TYPE="SUMMER">
INPUT fcs/elevator-cmd-norm
INPUT fcs/pitch-trim-cmd-norm
+ INPUT fcs/pitch-damper-gain
CLIPTO -1 1
</COMPONENT>
<COMPONENT NAME="Elevator Control" TYPE="AEROSURFACE_SCALE">
INPUT fcs/pitch-trim-sum
MIN -26
***************
*** 146,154 ****
--- 147,160 ----
OUTPUT fcs/elevator-pos-rad
GAIN 0.01745
</COMPONENT>
+ <COMPONENT NAME="Roll Damper Gain" TYPE="PURE_GAIN">
+ INPUT velocities/p-rad_sec
+ GAIN -0.013963
+ </COMPONENT>
<COMPONENT NAME="Roll Trim Sum" TYPE="SUMMER">
INPUT fcs/aileron-cmd-norm
INPUT fcs/roll-trim-cmd-norm
+ INPUT fcs/roll-damper-gain
CLIPTO -1 1
</COMPONENT>
<COMPONENT NAME="Left Aileron Control" TYPE="AEROSURFACE_SCALE">
***************
*** 165,183 ****
GAIN 0.01745
OUTPUT fcs/right-aileron-pos-rad
</COMPONENT>
! <COMPONENT NAME="Roll Damper Gain" TYPE="PURE_GAIN">
! INPUT velocities/p-rad_sec
! GAIN 0.013963
! </COMPONENT>
<COMPONENT NAME="Yaw Trim Sum" TYPE="SUMMER">
INPUT fcs/rudder-cmd-norm
INPUT fcs/yaw-trim-cmd-norm
CLIPTO -1 1
</COMPONENT>
- <COMPONENT NAME="Yaw Damper Gain" TYPE="PURE_GAIN">
- INPUT velocities/r-rad_sec
- GAIN 0.001745
- </COMPONENT>
<COMPONENT NAME="Rudder Control" TYPE="AEROSURFACE_SCALE">
INPUT fcs/yaw-trim-sum
MIN -30
--- 171,186 ----
GAIN 0.01745
OUTPUT fcs/right-aileron-pos-rad
</COMPONENT>
! <COMPONENT NAME="Yaw Damper Gain" TYPE="PURE_GAIN">
! INPUT velocities/r-rad_sec
! GAIN -0.001745
! </COMPONENT>
<COMPONENT NAME="Yaw Trim Sum" TYPE="SUMMER">
INPUT fcs/rudder-cmd-norm
INPUT fcs/yaw-trim-cmd-norm
+ INPUT fcs/yaw-damper-gain
CLIPTO -1 1
</COMPONENT>
<COMPONENT NAME="Rudder Control" TYPE="AEROSURFACE_SCALE">
INPUT fcs/yaw-trim-sum
MIN -30
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