OpenMDAO / OpenMDAO/Aviary

Investigate and potentially remove Aircraft.Design.CRUISE_ALTITUDE variable

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#1,039 1 comment 0 reactions 5 assignees View on GitHub

@nathanperreau is already working on this.

Since Apr 2, 2026.

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Description

Desired capability or behavior.

This variable is only really used for initial guessing (which should probably be replaced by guesses from phase_info) and in gasp_based/design_load.py in load_parameters() where it is used to compute max_mach, density_ratio and an intermediate value V9. Other inputs are some velocities, vel_c and max_airspeed and some other options.

Perhaps we should remove this variable entirely, and instead ask the user to directly specify max_mach and max flight speed. Any density ratios could be computed by the atmospheric models? Currently this module has atmospheric assumptions baked into the aircraft design.

Is your feature request related to a problem? Please describe.

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Associated Bug Report

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