Effector Mass Properties

[seb-argo]

A distinguishing factor between state effectors and dynamic effectors is the presence of an EffectorMassProps effProps member in the state effector interface. I'm wondering why this variable was left out of the dynamic effector interface; it seems like the result is that effectors such as torque rods and thrusters (when used as dynamic effectors) are effectively being treated as massless. For example, in the thruster dynamic effector attached body unit test where there is just a spacecraft with a thruster attached, the mass, center of mass, and inertia matrix changes that would occur on the hub when modeling an attached thruster are not included in the dynamics. Is my understanding of this correct? And if so, why was this omitted from dynamic effectors? Is the user expected to provide hub mass properties that already account for these dynamic effectors?

Reading this discussion it seems like something similar is happening with the reaction wheel model, so this phenomenon is not limited to dynamic effectors.

[joaogvcarneiro]

dynamicEffectors are supposed only to contribute forces and torques to the spacecraft, not change their mass properties. If an effector changes the spacecraft's mass and inertia, it should be modeled as a stateEffector instead.