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Talking CoG

https://thejabberwocky.net/viewtopic.php?f=54&t=544

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Re: Talking CoG

Posted: Sun May 22, 2016 12:05 pm
by bomber
No worries. ... with that engine that's what I'd expect.

Re: Talking CoG

Posted: Sun May 22, 2016 3:15 pm
by bomber
Mass Ballance section of the FDM would look something like this..

Code: Select all

    <mass_balance>
        <ixx unit="SLUG*FT2"> 0 </ixx>
        <iyy unit="SLUG*FT2"> 0 </iyy>
        <izz unit="SLUG*FT2"> 0 </izz>
        <emptywt unit="LBS"> 0 </emptywt>
        <location name="CG" unit="IN">
            <x> 0 </x>
            <y> 0 </y>
            <z> 0 </z>
        </location>


   <!-- #### TARE WEIGHT #### -->      
   <!-- #### FUSELAGE #### -->   
   <!-- #### Fore #### -->      
      <pointmass name="foreward_fuselage"> <!-- 0 -->
            <weight unit="LBS"> 4 </weight>
            <location name="POINTMASS" unit="FT">
                <x> -1.64 </x>
                <y> 0.0 </y>
                <z> -0.28 </z>
            </location>
          </pointmass>
      <property value="1"> T4T/structure/foreward_fuselage/damage </property>
      
      <pointmass name="prop"> <!-- 1 -->
            <weight unit="LBS"> 41 </weight>
            <location name="POINTMASS" unit="FT">
                <x> -3.48 </x>
                <y> 0.0 </y>
                <z> 0.0 </z>
            </location>
          </pointmass>
      <property value="1"> T4T/structure/prop/damage </property>
      
      <pointmass name="engine"> <!-- 2 -->
            <weight unit="LBS"> 170 </weight>
            <location name="POINTMASS" unit="FT">
                <x> -1.64 </x>
                <y> 0.0 </y>
                <z> -0.28 </z>
            </location>
          </pointmass>
      <property value="1"> T4T/structure/engine/damage </property>

      <pointmass name="engine_accessories"> <!-- 3 -->
            <weight unit="LBS"> 43 </weight>
            <location name="POINTMASS" unit="FT">
                <x> -1.64 </x>
                <y> 0.0 </y>
                <z> -0.28 </z>
            </location>
          </pointmass>
      <property value="1"> T4T/structure/engine_accessories/damage </property>

      <pointmass name="oil_tank"> <!-- 4 -->
            <weight unit="LBS"> 9 </weight>
            <location name="POINTMASS" unit="FT">
                <x> -1.64 </x>
                <y> 0.0 </y>
                <z> -1.64 </z>
            </location>
          </pointmass>
      <property value="1"> T4T/structure/oil_tank/damage </property>
      
      <pointmass name="nose_wheel"> <!-- 5 -->
            <weight unit="LBS"> 25 </weight>
            <location name="POINTMASS" unit="FT">
                <x> -0.98 </x>
                <y> 0.0 </y>
                <z> -3.48 </z>
            </location>
          </pointmass>
      <property value="1"> T4T/structure/nose_wheel/damage </property>

<!-- #### Mid #### -->
         
      <pointmass name="mid_fuselage"> <!-- 6 -->
            <weight unit="LBS"> 142 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 3.99 </x>
                <y> 0.0 </y>
                <z> 0.0 </z>
            </location>
          </pointmass>
      <property value="1"> T4T/structure/mid_fuselage/damage </property>
      
      <pointmass name="pilot_controls"> <!-- 7 -->
            <weight unit="LBS"> 66 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.1 </x>
                <y> -0.95 </y>
                <z> 0.0 </z>
            </location>
        </pointmass>
      <pointmass name="pilot_seat"> <!-- 8 -->
            <weight unit="LBS"> 20 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 3.74 </x>
                <y> -0.95 </y>
                <z> -1.21 </z>
            </location>
        </pointmass>

      <pointmass name="co-pilot_controls"> <!-- 9 -->
            <weight unit="LBS"> 66 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.1 </x>
                <y> 0.95 </y>
                <z> 0.0 </z>
            </location>
        </pointmass>
      <pointmass name="co-pilot_seat"> <!-- 10 -->
            <weight unit="LBS"> 20 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 3.74 </x>
                <y> 0.95 </y>
                <z> -1.21 </z>
            </location>
        </pointmass>
      
      <pointmass name="passenger_left_seat"> <!-- 11 -->
            <weight unit="LBS"> 20 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 6.56 </x>
                <y> -0.95 </y>
                <z> -1.21 </z>
            </location>
        </pointmass>
      <pointmass name="passenger_right_seat"> <!-- 12 -->
            <weight unit="LBS"> 20 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 6.56 </x>
                <y> 0.95 </y>
                <z> -1.21 </z>
            </location>
        </pointmass>

   <!-- #### Aft #### -->
      <pointmass name="aft_fuselage"> <!-- 13 -->
            <weight unit="LBS"> 35 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 9.84 </x>
                <y> 0.0 </y>
                <z> 0.0 </z>
            </location>
        </pointmass>
      <property value="1"> T4T/structure/aft_fuselage/damage </property>


   <!-- #### WINGS #### -->
   <!-- #### left #### -->
   
      <pointmass name="wing_left_1"> <!-- 14 -->
            <weight unit="LBS"> 17 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.58 </x>
                <y> -1.11 </y>
                <z> -1 </z>
            </location>
        </pointmass>
         <property value="2.58" unit="FT"> T4T/structure/wing_left_1/x </property>
         <property value="-1.11" unit="FT"> T4T/structure/wing_left_1/y </property>
         <property value="-1" unit="FT"> T4T/structure/wing_left_1/z </property>
         <property value="13.8" unit="FT2"> T4T/structure/wing_left_1/area </property>         
         <property value="1.5" unit="DEG"> T4T/structure/wing_left_1/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_left_1/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_left_1/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_left_1/damage </property>
   
      <pointmass name="wing_left_2"> <!-- 15 -->
            <weight unit="LBS"> 11 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.62 </x>
                <y> -2.99 </y>
                <z> -0.76 </z>
            </location>
        </pointmass>
         <property value="2.62" unit="FT"> T4T/structure/wing_left_2/x </property>
         <property value="-2.99" unit="FT"> T4T/structure/wing_left_2/y </property>
         <property value="-0.76" unit="FT"> T4T/structure/wing_left_2/z </property>
         <property value="11" unit="FT2"> T4T/structure/wing_left_2/area </property>         
         <property value="1.1" unit="DEG"> T4T/structure/wing_left_2/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_left_2/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_left_2/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_left_2/damage </property>

      <pointmass name="wing_left_3"> <!-- 16 -->
            <weight unit="LBS"> 12 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.65 </x>
                <y> -4.69 </y>
                <z> -0.55 </z>
            </location>
        </pointmass>
         <property value="2.65" unit="FT"> T4T/structure/wing_left_3/x </property>
         <property value="-4.69" unit="FT"> T4T/structure/wing_left_3/y </property>
         <property value="-0.55" unit="FT"> T4T/structure/wing_left_3/z </property>
         <property value="11" unit="FT2"> T4T/structure/wing_left_3/area </property>         
         <property value="0.7" unit="DEG"> T4T/structure/wing_left_3/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_left_3/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_left_3/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_left_3/damage </property>
         
      <pointmass name="wing_left_4"> <!-- 17 -->
            <weight unit="LBS"> 10 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.69 </x>
                <y> -6.58 </y>
                <z> -0.32 </z>
            </location>
        </pointmass>
         <property value="2.69" unit="FT"> T4T/structure/wing_left_4/x </property>
         <property value="-6.58" unit="FT"> T4T/structure/wing_left_4/y </property>
         <property value="-0.32" unit="FT"> T4T/structure/wing_left_4/z </property>
         <property value="10.6" unit="FT2"> T4T/structure/wing_left_4/area </property>         
         <property value="0.3" unit="DEG"> T4T/structure/wing_left_4/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_left_4/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_left_4/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_left_4/damage </property>
   
      <pointmass name="wing_left_5"> <!-- 18 -->
            <weight unit="LBS"> 8 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.73 </x>
                <y> -8.39 </y>
                <z> -0.1 </z>
            </location>
        </pointmass>
         <property value="2.73" unit="FT"> T4T/structure/wing_left_5/x </property>
         <property value="-8.39" unit="FT"> T4T/structure/wing_left_5/y </property>
         <property value="-0.1" unit="FT"> T4T/structure/wing_left_5/z </property>
         <property value="9.8" unit="FT2"> T4T/structure/wing_left_5/area </property>         
         <property value="-0.1" unit="DEG"> T4T/structure/wing_left_5/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_left_5/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_left_5/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_left_5/damage </property>
         
      <pointmass name="wing_left_6"> <!-- 19 -->
            <weight unit="LBS"> 8 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.77 </x>
                <y> -10.27 </y>
                <z> 0.14 </z>
            </location>
      </pointmass>
         <property value="2.77" unit="FT"> T4T/structure/wing_left_6/x </property>
         <property value="-10.27" unit="FT"> T4T/structure/wing_left_6/y </property>
         <property value="0.14" unit="FT"> T4T/structure/wing_left_6/z </property>
         <property value="9" unit="FT2"> T4T/structure/wing_left_6/area </property>         
         <property value="-0.5" unit="DEG"> T4T/structure/wing_left_6/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_left_6/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_left_6/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_left_6/damage </property>

      <pointmass name="wing_left_7"> <!-- 20 -->
            <weight unit="LBS"> 6 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.81 </x>
                <y> -12.21 </y>
                <z> 0.38 </z>
            </location>
      </pointmass>
         <property value="2.81" unit="FT"> T4T/structure/wing_left_7/x </property>
         <property value="-12.21" unit="FT"> T4T/structure/wing_left_7/y </property>
         <property value="0.38" unit="FT"> T4T/structure/wing_left_7/z </property>
         <property value="8.3" unit="FT2"> T4T/structure/wing_left_7/area </property>         
         <property value="-0.9" unit="DEG"> T4T/structure/wing_left_7/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_left_7/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_left_7/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_left_7/damage </property>
         

      <pointmass name="wing_left_8"> <!-- 21 -->
            <weight unit="LBS"> 5 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.85 </x>
                <y> -14.12 </y>
                <z> 0.62 </z>
            </location>
      </pointmass>
         <property value="-2.85" unit="FT"> T4T/structure/wing_left_8/x </property>
         <property value="-14.12" unit="FT"> T4T/structure/wing_left_8/y </property>
         <property value="0.62" unit="FT"> T4T/structure/wing_left_8/z </property>
         <property value="5.5" unit="FT2"> T4T/structure/wing_left_8/area </property>         
         <property value="-1.5" unit="DEG"> T4T/structure/wing_left_8/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_left_8/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_left_8/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_left_8/damage </property>

      <pointmass name="gear_left"> <!-- 22 -->
         <weight unit="LBS"> 34 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 3.74 </x>
                <y> -3.28 </y>
                <z> -3.48 </z>
            </location>
        </pointmass>
         <property value="3.74" unit="FT"> T4T/structure/gear_left/x </property>
         <property value="-3.28" unit="FT"> T4T/structure/gear_left/y </property>
         <property value="-3.48" unit="FT"> T4T/structure/gear_left/z </property>
         <property value="1"> T4T/structure/gear_left/damage </property>
         
      <pointmass name="fuel-tank-left"> <!-- 23 -->
            <weight unit="LBS"> 10 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.81 </x>
                <y> -5.64 </y>
                <z> -0.55 </z>
            </location>
        </pointmass>
         <property value="1"> T4T/structure/fuel-tank_left/damage </property>
         
   <!-- #### right #### -->
   
      <pointmass name="wing_right_1"> <!-- 22 -->
            <weight unit="LBS"> 17 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.58 </x>
                <y> 1.11 </y>
                <z> -1 </z>
            </location>
        </pointmass>
         <property value="2.58" unit="FT"> T4T/structure/wing_right_1/x </property>
         <property value="-1.11" unit="FT"> T4T/structure/wing_right_1/y </property>
         <property value="-1" unit="FT"> T4T/structure/wing_right_1/z </property>
         <property value="13.8" unit="FT2"> T4T/structure/wing_right_1/area </property>         
         <property value="1.5" unit="DEG"> T4T/structure/wing_right_1/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_right_1/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_right_1/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_right_1/damage </property>
   
      <pointmass name="wing_right_2"> <!-- 23 -->
            <weight unit="LBS"> 11 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.62 </x>
                <y> 2.99 </y>
                <z> -0.76 </z>
            </location>
        </pointmass>
         <property value="2.62" unit="FT"> T4T/structure/wing_right_2/x </property>
         <property value="2.99" unit="FT"> T4T/structure/wing_right_2/y </property>
         <property value="-0.76" unit="FT"> T4T/structure/wing_right_2/z </property>
         <property value="11" unit="FT2"> T4T/structure/wing_right_2/area </property>         
         <property value="1.1" unit="DEG"> T4T/structure/wing_right_2/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_right_2/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_right_2/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_right_2/damage </property>

      <pointmass name="wing_right_3"> <!-- 24 -->
            <weight unit="LBS"> 12 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.65 </x>
                <y> 4.69 </y>
                <z> -0.55 </z>
            </location>
        </pointmass>
         <property value="2.65" unit="FT"> T4T/structure/wing_right_3/x </property>
         <property value="4.69" unit="FT"> T4T/structure/wing_right_3/y </property>
         <property value="-0.55" unit="FT"> T4T/structure/wing_right_3/z </property>
         <property value="11" unit="FT2"> T4T/structure/wing_right_3/area </property>         
         <property value="0.7" unit="DEG"> T4T/structure/wing_right_3/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_right_3/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_right_3/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_right_3/damage </property>
         
      <pointmass name="wing_right_4"> <!-- 25 -->
            <weight unit="LBS"> 10 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.69 </x>
                <y> 6.58 </y>
                <z> -0.32 </z>
            </location>
        </pointmass>
         <property value="2.69" unit="FT"> T4T/structure/wing_right_4/x </property>
         <property value="6.58" unit="FT"> T4T/structure/wing_right_4/y </property>
         <property value="-0.32" unit="FT"> T4T/structure/wing_right_4/z </property>
         <property value="10.6" unit="FT2"> T4T/structure/wing_right_4/area </property>         
         <property value="0.3" unit="DEG"> T4T/structure/wing_right_4/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_right_4/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_right_4/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_right_4/damage </property>
   
      <pointmass name="wing_right_5"> <!-- 26 -->
            <weight unit="LBS"> 8 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.73 </x>
                <y> 8.39 </y>
                <z> -0.1 </z>
            </location>
        </pointmass>
         <property value="2.73" unit="FT"> T4T/structure/wing_right_5/x </property>
         <property value="8.39" unit="FT"> T4T/structure/wing_right_5/y </property>
         <property value="-0.1" unit="FT"> T4T/structure/wing_right_5/z </property>
         <property value="9.8" unit="FT2"> T4T/structure/wing_right_5/area </property>         
         <property value="-0.1" unit="DEG"> T4T/structure/wing_right_5/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_right_5/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_right_5/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_right_5/damage </property>
         
      <pointmass name="wing_right_6"> <!-- 27 -->
            <weight unit="LBS"> 8 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.77 </x>
                <y> 10.27 </y>
                <z> 0.14 </z>
            </location>
      </pointmass>
         <property value="2.77" unit="FT"> T4T/structure/wing_right_6/x </property>
         <property value="10.27" unit="FT"> T4T/structure/wing_right_6/y </property>
         <property value="0.14" unit="FT"> T4T/structure/wing_right_6/z </property>
         <property value="9" unit="FT2"> T4T/structure/wing_right_6/area </property>         
         <property value="-0.5" unit="DEG"> T4T/structure/wing_right_6/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_right_6/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_right_6/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_right_6/damage </property>

      <pointmass name="wing_right_7"> <!-- 28 -->
            <weight unit="LBS"> 6 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.81 </x>
                <y> 12.21 </y>
                <z> 0.38 </z>
            </location>
      </pointmass>
         <property value="2.81" unit="FT"> T4T/structure/wing_right_7/x </property>
         <property value="12.21" unit="FT"> T4T/structure/wing_right_7/y </property>
         <property value="0.38" unit="FT"> T4T/structure/wing_right_7/z </property>
         <property value="8.3" unit="FT2"> T4T/structure/wing_right_7/area </property>         
         <property value="-0.9" unit="DEG"> T4T/structure/wing_right_7/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_right_7/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_right_7/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_right_7/damage </property>
         

      <pointmass name="wing_right_8"> <!-- 29 -->
          <weight unit="LBS"> 5 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.85 </x>
                <y> 14.12 </y>
                <z> 0.62 </z>
            </location>
      </pointmass>
         <property value="2.85" unit="FT"> T4T/structure/wing_right_8/x </property>
         <property value="14.12" unit="FT"> T4T/structure/wing_right_8/y </property>
         <property value="0.62" unit="FT"> T4T/structure/wing_right_8/z </property>
         <property value="5.5" unit="FT2"> T4T/structure/wing_right_8/area </property>         
         <property value="-1.5" unit="DEG"> T4T/structure/wing_right_8/incidence-deg </property>
         <property value="8.0" unit="DEG"> T4T/structure/wing_right_8/dihedral-deg </property>
         <property value="3.0" unit="DEG"> T4T/structure/wing_right_8/sweep-deg </property>         
         <property value="1"> T4T/structure/wing_right_8/damage </property>

      <pointmass name="gear_right"> <!-- 30 -->
         <weight unit="LBS"> 34 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 3.74 </x>
                <y> 3.28 </y>
                <z> -3.48 </z>
            </location>
        </pointmass>
         <property value="3.74" unit="FT"> T4T/structure/gear_right/x </property>
         <property value="3.28" unit="FT"> T4T/structure/gear_right/y </property>
         <property value="-3.48" unit="FT"> T4T/structure/gear_right/z </property>
         <property value="1"> T4T/structure/gear_right/damage </property>
         
      <pointmass name="fuel-tank-right"> <!-- 31 -->
            <weight unit="LBS"> 10 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 2.81 </x>
                <y> 5.64 </y>
                <z> -0.55 </z>
            </location>
        </pointmass>
         <property value="1"> T4T/structure/fuel-tank_right/damage </property>

   <!-- #### V-STAB #### -->
      <pointmass name="v-stab"> <!-- 32 -->
            <weight unit="LBS"> 23 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 16.01 </x>
                <y> 0.0 </y>
                <z> 1.56 </z>
            </location>
        </pointmass>
         <property value="16.01" unit="FT"> T4T/structure/v-stab/x </property>
         <property value="0" unit="FT"> T4T/structure/v-stab/y </property>
         <property value="1.56" unit="FT"> T4T/structure/v-stab/z </property>
         <property value="43" unit="DEG"> T4T/structure/v-stab/sweep-deg </property>            
         <property value="1"> T4T/structure/v-stab/damage </property>


      <pointmass name="lead-ballast"> <!-- 33 -->
            <weight unit="LBS"> 0 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 4.4 </x>
                <y> 0.0 </y>
                <z> 0.92 </z>
            </location>
        </pointmass>

   <!-- #### H-STAB #### -->
   <!-- #### left #### -->
      <pointmass name="h-stab_left"> <!-- 34 -->
            <weight unit="LBS"> 8 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 15.16 </x>
                <y> -2.94 </y>
                <z> 1.07 </z>
            </location>
        </pointmass>
         <property value="15.16" unit="FT"> T4T/structure/h-stab_left/x </property>
         <property value="-2.94" unit="FT"> T4T/structure/h-stab_left/y </property>
         <property value="1.07" unit="FT"> T4T/structure/h-stab_left/z </property>
         <property value="12.2" unit="FT2"> T4T/structure/h-stab_left/area </property>         
         <property value="0.0" unit="DEG"> T4T/structure/h-stab/incidence-deg </property> <!-- 1) Adjust to give max lift/drag attitiude angle  -->
         <property value="0.0" unit="DEG"> T4T/structure/h-stab/dihedral-deg </property>   
         <property value="0.0" unit="DEG"> T4T/structure/h-stab/sweep-deg </property>            
         <property value="1"> T4T/structure/h-stab_left/damage </property>
      

   <!-- #### H-STAB #### -->
   <!-- #### right #### -->
      <pointmass name="h-stab_right"> <!-- 35 -->
            <weight unit="LBS"> 8 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 15.16 </x>
                <y> 2.94 </y>
                <z> 1.07 </z>
            </location>
        </pointmass>
         <property value="15.16" unit="FT"> T4T/structure/h-stab_right/x </property>
         <property value="2.94" unit="FT"> T4T/structure/h-stab_right/y </property>
         <property value="1.07" unit="FT"> T4T/structure/h-stab_right/z </property>
         <property value="12.2" unit="FT2"> T4T/structure/h-stab_right/area </property>            
         <property value="1"> T4T/structure/h-stab_right/damage </property>

   <!-- #### /TARE WEIGHT #### -->

   <!-- #### REMOVEABLE WEIGHT #### -->

      <pointmass name="pilot">  <!-- 36 -->
            <weight unit="LBS"> 170 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 3.74 </x>
                <y> -0.95 </y>
                <z> -1.21 </z>
            </location>
        </pointmass>
      
      <pointmass name="co-pilot">  <!-- 37 -->
            <weight unit="LBS"> 170 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 3.74 </x>
                <y> 0.95 </y>
                <z> -1.21 </z>
            </location>
        </pointmass>      

      <pointmass name="passenger_left">  <!-- 38 -->
            <weight unit="LBS"> 30 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 6.56 </x>
                <y> -0.95 </y>
                <z> -1.21 </z>
            </location>
        </pointmass>
      
      <pointmass name="passenger_right">  <!-- 39 -->
            <weight unit="LBS"> 30 </weight>
            <location name="POINTMASS" unit="FT">
                <x> 6.56 </x>
                <y> 0.95 </y>
                <z> -1.21 </z>
            </location>
        </pointmass>
<!--
      <pointmass name="CoG">
            <weight unit="LBS"> 10000 </weight>
            <location name="POINTMASS" unit="IN">
         <x> 6.517779904 </x>
         <y> 0.0 </y>
         <z> 16.6132823 </z>
            </location>
        </pointmass>


      <pointmass name="co-eff1">
            <weight unit="LBS"> 2000 </weight>
            <location name="POINTMASS" unit="FT">
                <x> -3.5 </x>
                <y> -20 </y>
                <z> -20 </z>
            </location>
        </pointmass>
      
      <pointmass name="co-eff2">
            <weight unit="LBS"> 2000 </weight>
            <location name="POINTMASS" unit="FT">
                <x> -3.5 </x>
                <y> 20 </y>
                <z> -20 </z>
            </location>
        </pointmass>


      <pointmass name="co-eff3">
            <weight unit="LBS"> 2000 </weight>
            <location name="POINTMASS" unit="FT">
                <x> -4.75 </x>
                <y> 0.0 </y>
                <z> -4.737 </z>
            </location>
        </pointmass>      
   -->

    </mass_balance>

Re: Talking CoG

Posted: Sun May 22, 2016 4:10 pm
by bomber
Just to clarify I've as yet not done any aerodynamic stuff... it's all been a bit of a 'spreadsheet jockey'...and we've nailed the engine, it's prop and the planes CoG and inertia.

This is something that anyone here could do, they don't even need to be a 3d modeler as it's just a bit of 2d tracing and some dimensioning.

and I've the spreadsheets and drawings to get you started.

regards

Simon

Re: Talking CoG

Posted: Sun May 22, 2016 4:15 pm
by IAHM-COL
I can blender it and get values if you are clear for what's needed :P

IH-COL

Re: Talking CoG

Posted: Sun May 22, 2016 7:27 pm
by jwocky
You need to insert the empty weight. And yes, well, she pulls a bit if there is only a single person in it, but it's not wild and the torque make her pull worse anyway.

Sanhozay: You are right, JSB calculates it on the fly. So, well, technically, you can even make a plane with people moving around or eating their snacks and those tiny little weight shifts. But the moment, you see the plane, JSB has already done it. You fill for example more fuel in the tanks, JSB does it again. So, the behavior of the plane changes and you feel it why flying. Which also means, effective CoG is changing all the time. You burn fuel, tanks go lighter, CoG changes. Theoretically, well, not in a pup, but theoretically, if the pilot hands over to the copilot and goes for the lavatory, CoG changes.
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