Flightgear FDM properties

Work in progress This article or section will be worked on in the upcoming hours or days. See history for the latest developments.

introduction

We will document here the fdm properties used in FG, starting with those present in the fdm state. As some are not concordant between yasim/jsbsim, their actual meaning dépending the fdm will be exposed, and we will fill the table each time one conflict is resolved.

properties table

table legend:

• Property name: the name of the property in the fg tree, with a link to the property description, as seen by the different fdm and the choice made.
• quick description: a link to a long description (if available) with exemples
• unit:
• type:
• native: included in the native-fdm protocol
• fdm-state: part of the fdm state
• conflict: if there's currently a conflict between different fdm, for more details see the property name
• fixed in: the FG version wich solved the conflict

Property name	quick description	unit	type	native	fdm-state	conflict	fixed in
/velocities/mach	mach speed					yes	3.0
/velocities/uBody-fps	ECEF velocities	fps		yes		yes	3.0
/velocities/vBody-fps	ECEF velocities	fps		yes		yes	3.0
/velocities/wBody-fps	ECEF velocities	fps		yes		yes	3.0
/orientation/alpha-deg	rel wind vertical angle	degree				no	-
/orientation/side-slip-deg	rel wind hor angle	degree				yes
name	desc.	unit	type	nat	fdm	conf	fix