Mass Properties removes interior components?

[Austin Stark]

Hi all,

I am running OpenVSP through the Matlab API and am reading the output MassProps.txt file for the assembly. When analyzing the full assembly file the output seems to neglect computing bodies which are within the fuselage (Motor, Payload, Battery) and just reports zeros across the board. This is shown in 'Full_MassProps.txt'.

What is the reason for this? And is there a way to yield this information besides just running a separate analysis for the internal components? When analyzing just the motor the MassProps are what would be expected.

Thanks,

Austin

[Rob McDonald]

Bodies are treated as solid for MassProp.

If you have a (solid) fuselage that contains a (solid) engine, they overlap the same x,y,z point in space.  For these situations, you need to tell OpenVSP which Geom's density to use for that volume.

This is done with the mass priority value that is just under the density value on the Gen tab.

If multiple objects overlap, the density for the one with the highest priority is used.

Hope this helps,

Rob

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