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Recalculate trunk inertia properties #44

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@Frydjak

<!-- moments of inertia -->
<!-- Current Inertia values approximated by cuboid, not real CAD values,
real robot trunk dimensions 72x34x14cm XYZ,
here used inertia values fo cuboid 50x34x14 of uniform density to betterapproximate real weight distribution-->
<xacro:property name="trunk_ixx" value="112667000.0"/> <!-- g*mm^2-->
<xacro:property name="trunk_ixy" value="0"/> <!-- g*mm^2-->
<xacro:property name="trunk_ixz" value="00"/> <!-- g*mm^2-->
<xacro:property name="trunk_iyy" value="224667000.0"/> <!-- g*mm^2-->
<xacro:property name="trunk_iyz" value="0"/> <!-- g*mm^2-->
<xacro:property name="trunk_izz" value="304667000.0"/> <!-- g*mm^2-->

Current Inertia values approximated by cuboid, not real CAD values, real robot trunk dimensions are 72x34x14cm XYZ, but in code I used inertia values of cuboid 50x34x14 of uniform density to better approximate real weight distribution.

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