Doc issue: help(stead_state_trim)

[rebcabin]

Does a trimmed state include a coordinated turn? If so, should the help say something like the following:

"Steady-state aircraft flight is defined as a condition in which all motion variables [ in a body-fixed reference frame ] are constant or zero. That is, the linear and angular velocity components [ in a body-fixed reference frame ] are constant or zero, thus all acceleration components [ in a body-fixed reference frame ] are zero. [ In a coordinated turn, a non-zero centripetal acceleration will be observed in an Earth-fixed reference frame. ]

[gurkanctn]

How about the normal acceleration (a_z)? That also is not zero but constant for steady state trims.

[AlexS12]

Hi @rebcabin. The definition has been obtained from https://books.google.es/books/about/Aircraft_Control_and_Simulation.html?id=T0Ux6av4btIC&redir_esc=y and can also be found in other Flight Mechanics books. I think the misunderstanding comes from "motion variables" which in other references, such as Etkin, is replaced by (u, v, w, p, q, r).

I see no problem in saying that they must be expressed in body axis, like Etkin does. If you could make a pull request I would kindly merge it. Let me know if you need any help with the process