Gear spring and damping coefficients

[HHS81]

To remove the bouncing of jet version after replay I replaced the jet fdm with the prop one (other engines of course).

I wasn't happy with the gear spring and damping coefficients. Now they are a bit stiffer and should show a more realistic behavior.

Please insert this and test:

<contact type="BOGEY" name="NOSE">
<!--structure by Michael Soitanen, coefficients by Heiko Schulz-->
   <location unit="IN">
     <x> -343.49 </x>
     <y>   0.00 </y>
     <z> -11.74 </z>
   </location>
   <static_friction>  0.80 </static_friction>
            <dynamic_friction> 0.50 </dynamic_friction>
            <rolling_friction> 0.02 </rolling_friction>
            <strut_force>
                <function>
                    <sum>
                        <product>
                            <value>-1</value>
                            <table>
                                <independentVar>gear/unit[0]/compression-ft</independentVar>
                                <tableData>
            0       0
            0.65   600
            1.3     45500
            1.31    49000
                                </tableData>
                            </table>
                        </product>
                        <ifthen>
                            <ge>
                                <property> gear/unit[0]/compression-velocity-fps </property>
                                <value> 0.0 </value>
                            </ge>
                            <product>
                                <value> -1100 </value>
                                <property> gear/unit[0]/compression-velocity-fps </property>
                            </product>
                            <product>
                                <value> -2600 </value>
                                <property> gear/unit[0]/compression-velocity-fps </property>
                            </product>
                        </ifthen>
                    </sum>
                </function>
            </strut_force>
            <max_steer unit="DEG"> 10 </max_steer>
            <brake_group> NONE </brake_group>
            <retractable>1</retractable>
        </contact>

  <contact type="BOGEY" name="LEFT_MAIN">
<!--structure by Michael Soitanen, coefficients by Heiko  Schulz-->
<location unit="IN">
     <x> -54.044 </x>
     <y>   -63.39 </y>
     <z> -9.11 </z>
   </location>
   <static_friction>0.8</static_friction>
   <dynamic_friction> 0.5 </dynamic_friction>
   <rolling_friction> 0.02 </rolling_friction>
           <strut_force>
                <function>
                    <sum>
                        <product>
                            <value>-1</value>
                            <table>
                                <independentVar>gear/unit[1]/compression-ft</independentVar>
                                <tableData>
                                    0       0
                                    0.042   555
                                    1.30  50500
                                    1.31    65000
                                </tableData>
                            </table>
                        </product>
                        <ifthen>
                            <ge>
                                <property> gear/unit[1]/compression-velocity-fps </property>
                                <value> 0.0 </value>
                            </ge>
                            <product>
                                <value> -2500 </value>
                                <property> gear/unit[1]/compression-velocity-fps </property>
                            </product>
                            <product>
                                <value> -3900</value>
                                <property> gear/unit[1]/compression-velocity-fps </property>
                            </product>
                        </ifthen>
                    </sum>
                </function>
            </strut_force>
   <max_steer unit="DEG">0</max_steer>
   <brake_group>LEFT</brake_group>
   <retractable>1</retractable>
  </contact>

  <contact type="BOGEY" name="RIGHT_MAIN">
<!--structure by Michael Soitanen, coefficients by Heiko Schulz-->
   <location unit="IN">
     <x> -54.044 </x>
     <y>   63.39 </y>
     <z> -9.11 </z>
   </location>
   <static_friction>  0.8 </static_friction>
   <dynamic_friction>0.5 </dynamic_friction>
   <rolling_friction> 0.02</rolling_friction>
           <strut_force>
                <function>
                    <sum>
                        <product>
                            <value>-1</value>
                            <table>
                                <independentVar>gear/unit[2]/compression-ft</independentVar>
                                <tableData>
                                    0       0
                                    0.042   555
                                    1.30   50500
                                    1.31    65000
                                </tableData>
                            </table>
                        </product>
                        <ifthen>
                            <ge>
                                <property> gear/unit[2]/compression-velocity-fps </property>
                                <value> 0.0 </value>
                            </ge>
                            <product>
                                <value> -2500</value>
                                <property> gear/unit[2]/compression-velocity-fps </property>
                            </product>
                            <product>
                                <value> -3900 </value>
                                <property> gear/unit[2]/compression-velocity-fps </property>
                            </product>
                        </ifthen>
                    </sum>
                </function>
            </strut_force>
   <max_steer unit="DEG">0</max_steer>
   <brake_group>RIGHT</brake_group>
   <retractable>1</retractable>
  </contact>

[xcvb85]

Nice :+1: I added them to Issue67 branch.