hi Alan,
That's great but not what I meant, I'm talking about the FCS. Its using generic style JSBsim (at least in the git file i glanced thru). You should model each surface and each actuator!
Kind Regards,
josh
<channel name="Yaw">
<pure_gain name="Rudder trim limit">
<input>fcs/yaw-trim-cmd-norm</input>
<gain> 6.0</gain> <!-- 1=6deg, British convention, left is positive -->
<output>fcs/rudder-trim-limit</output>
</pure_gain>
<pure_gain name="rudder cmd deg">
<input>fcs/rudder-cmd-norm</input>
<gain> 12.5</gain> <!-- 1=12.5deg, British convention, left is positive -->
<output>fcs/rudder-cmd-deg</output>
</pure_gain>
<summer name="rudder sum">
<input>fcs/rudder-cmd-deg</input>
<input>fcs/rudder-trim-limit</input>
<input>fcs/afcs-rudder-cmd-deg</input>
<input>/systems/flight_test/rudder_input</input>
<output>fcs/rudder-sum</output>
</summer>
<pure_gain name="rudder norm">
<input>fcs/rudder-sum</input>
<gain>0.08 </gain><!-- 1=12.5deg -->
<output>fcs/rudder-pos-norm</output>
</pure_gain>
<pure_gain name="rudder rad">
<input>fcs/rudder-sum</input>
<gain>0.01745329251994329576923690768489</gain>
<output>fcs/rudder-pos-rad</output>
</pure_gain>
</channel>
Alant wrote in Tue Jan 12, 2021 10:04 am:
- Code: Select all
<pure_gain name="rudder rad">
<input>fcs/rudder-sum</input>
<gain>0.01745329251994329576923690768489</gain>
<output>fcs/rudder-pos-rad</output>
</pure_gain>
<fcs_function name="fcs/rudder-pos-rad">
<function>
<toradians><p>fcs/rudder-sum</p></toradians>
</function>
</fcs_function>
What about, one wider engine? May not be perfect but could be ok for approximating.As Datcom does not allow me to simulate the effect of the 4 rear mounted engines in their nacelles this may be a contributary factor
<function name="aero/moment/ground_effect">
<description>Pitch Moment_due_ground_effect</description>
<product>
<property>aero/qbar-psf</property>
<property>metrics/Sw-sqft</property>
<property>metrics/cbarw-ft</property>
<table name="aero/coefficient/CM_ground_effect">
<independentVar lookup="row">aero/alpha-deg</independentVar>
<independentVar lookup="column">velocities/mach</independentVar>
<tableData>
5.0 10.0 20.0 30.0 40.0 50.0 100
-10 -0.0186 -0.0129 -0.0052 -0.0022 -0.0011 -0.0006 0.0000
-6 -0.0109 -0.0075 -0.0030 -0.0013 -0.0007 -0.0004 0.0000
-4 -0.0031 -0.0021 -0.0009 -0.0004 -0.0002 -0.0001 0.0000
-2 0.0029 0.0021 0.0009 0.0004 0.0002 0.0001 0.0000
0 0.0070 0.0051 0.0024 0.0010 0.0006 0.0003 0.0000
2 0.0097 0.0072 0.0035 0.0016 0.0008 0.0005 0.0000
4 0.0113 0.0083 0.0042 0.0019 0.0010 0.0005 0.0000
6 0.0120 0.0088 0.0046 0.0020 0.0010 0.0005 0.0000
8 0.0113 0.0084 0.0046 0.0020 0.0009 0.0005 0.0000
10 0.0089 0.0067 0.0037 0.0016 0.0006 0.0002 0.0000
12 0.0061 0.0046 0.0025 0.0010 0.0003 0.0001 0.0000
14 0.0034 0.0027 0.0015 0.0006 0.0002 0.0000 0.0000
16 0.0008 0.0009 0.0006 0.0002 0.0000 -0.0001 0.0000
</tableData>
</table>
</product>
</function>
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