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Useful load update#1122

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cmbenne3 wants to merge 17 commits intoOpenMDAO:mainfrom
cmbenne3:useful_load_update
Open

Useful load update#1122
cmbenne3 wants to merge 17 commits intoOpenMDAO:mainfrom
cmbenne3:useful_load_update

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@cmbenne3 cmbenne3 commented Apr 29, 2026

Summary

This PR corrects the naming of Mission.USEFUL_LOAD to Mission.OPERATING_ITEMS_MASS, and adds a new component to calculate the correct value of Aircraft.Design.USEFUL_LOAD as Aircraft.Design.GROSS_MASS - Aircraft.Design.EMPTY_MASS.

A flops based test and gasp based test have been modified to ensure that this calculation is checked. It is a very simple calculation so is not added to every possible test.

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Backwards incompatibilities

None

New Dependencies

None

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Update Calculation and name for Mission.USEFUL_LOAD

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