AIRCRAFT FLIGHT MODEL VARIABLES
The tables below indicate the properties for the Simulation Variables that can be used to get and set properties related to the physical properties and flight model of an aircraft. For information on the units listed for each variable, please see here: Simulation Variable Units
NOTE: When Microsoft Flight Simulator is running in multiplayer mode, only a small number of variables are communicated between aircraft. Those variables that are available will say so in the description as being either for "All Aircraft" or for "Shared Cockpit".
You can find a complete index of all available SimVars here: SimVar Index
General
Simulation Variable  Description  Units  Settable 

BETA DOT 
Beta dot  Radians per second  
DECISION ALTITUDE MSL 
Design decision altitude above mean sea level  Feet (ft)  
DECISION HEIGHT 
Design decision height  Feet (ft)  
DESIGN CRUISE ALT 
This design constant represents the optimal altitude the aircraft should maintain when in cruise. It is derived from the cruise_alt setting in the [REFERENCE SPEEDS] section of the flightmodel.cfg. Default is 1500ft. 
Feet (ft)  
DESIGN SPAWN ALTITUDE CRUISE 
This design constant represents the spawn altitude for the aircraft when spawning in cruise. It is derived from the spawn_cruise_altitude setting in the [REFERENCE SPEEDS] section of the flightmodel.cfg. Default is 1500ft. 
Feet (ft)  
DESIGN SPAWN ALTITUDE DESCENT 
This design constant represents the spawn altitude for the aircraft when spawning in descent. It is derived from the spawn_descent_altitude setting in the [REFERENCE SPEEDS] section of the flightmodel.cfg. Default is 500ft. 
Feet (ft)  
DESIGN SPEED CLIMB 
This design constant represents the optimal climb speed for the aircraft. It is derived from the climb_speed setting in the [REFERENCE SPEEDS] section of the flightmodel.cfg. Default value is 1. 
Feet (ft) per second  
DESIGN SPEED MIN ROTATION 
This design constant represents the minimum speed required for aircraft rotation. It is derived from the rotation_speed_min setting in the [REFERENCE SPEEDS] section of the flightmodel.cfg. Default value is 1. 
Feet (ft) per second  
DESIGN SPEED VC 
This design constant represents the aircraft ideal cruising speed. It is derived from the cruise_speed setting in the [REFERENCE SPEEDS] section of the flightmodel.cfg. The default value is computed an internal function that uses the estimated cruise altitude and estimated cruise percent power, according of the engine type, the number of engines, the density, the wing area and some drag parameters. Normally this value is set in the CFG file and the default value is never used. 
Feet (ft) per second  
DESIGN SPEED VS0 
This design constant represents the the stall speed when flaps are fully extended. It is derived from the full_flaps_stall_speed setting in the [REFERENCE SPEEDS] section of the flightmodel.cfg. Default value is 0.8 x VS. 
kias  
DESIGN SPEED VS1 
This design constant represents the stall speed when flaps are fully retracted. It is derived from the flaps_up_stall_speed setting in the [REFERENCE SPEEDS] section of the flightmodel.cfg. Default value is 0. 
kias  
DESIGN TAKEOFF SPEED 
This design constant represents the aircraft ideal takoff speed. It is derived from the takeoff_speed setting in the [REFERENCE SPEEDS] section of the flightmodel.cfg. 
Knots  
DYNAMIC PRESSURE 
Dynamic pressure  Pounds per square foot (psf)  
ESTIMATED CRUISE SPEED 
Estimated cruise speed  Feet (ft) per second  
G FORCE 
Current g force  GForce  
G LIMITER SETTING 
This returns the setting of the Glimiter, as set using the GLimiterSetting parameter. 
Enum:


INCIDENCE ALPHA 
Angle of attack  Radians  
INCIDENCE BETA 
Sideslip angle  Radians  
IS TAIL DRAGGER 
True if the aircraft is a taildragger  Bool  
LINEAR CL ALPHA 
Linear CL alpha  Per radian  
MACH MAX OPERATE 
Maximum design mach  Mach  
MAX G FORCE 
Maximum G force attained  Gforce  
MIN DRAG VELOCITY 
Minimum drag velocity, in clean, with no input and no gears, when at 10000ft.  Feet (ft) per second  
MIN G FORCE 
Minimum G force attained  Gforce  
SEMIBODY LOADFACTOR X 
Deprecated, do not use!  Number  
SEMIBODY LOADFACTOR Y 
Acceleration along the axis Y divided by the gravity constant g (usually around 9.81m.s²)  Number  
SEMIBODY LOADFACTOR YDOT 
Derivative of SEMIBODY LOADFACTOR Y in relation to time. 
Per second  
SEMIBODY LOADFACTOR Z 
Deprecated, do not use!  Number  
SIGMA SQRT 
Sigma sqrt  Number  
SIMULATED RADIUS 
Simulated radius  Feet (ft)  
STALL ALPHA 
The angle of attack which produces the maximum lift coefficient before entering into stall conditions.  Radians  
STATIC PITCH 
The angle at which static pitch stability is achieved.  Radians  
TYPICAL DESCENT RATE 
the typical (normal) descent rate for the aircraft.  Feet (ft) per minute  
WING AREA 
Total wing area  Square feet (ft)  
WING FLEX PCT:index 
The current wing flex. Different values can be set for each wing (for example, during banking). Set an index of 1 for the left wing, and 2 for the right wing.  Percent Over 100  
WING SPAN 
Total wing span  Feet (ft)  
YAW STRING ANGLE 
The yaw string angle. Yaw strings are attached to gliders as visible indicators of the yaw angle. An animation of this is not implemented in ESP.  Radians  
YAW STRING PCT EXTENDED 
Yaw string angle as a percentage  Percent Over 100  
ZERO LIFT ALPHA 
The angle of attack at which the wing has zero lift.  Radians 
Center Of Gravity
Simulation Variable  Description  Units  Settable 

CG AFT LIMIT 
Most backward authorized position of the CG according to the POH. NOTE: This is only valid for airplanes. 
Percent Over 100  
CG FEET 
The longitudinal CG position relative to the Reference Datum Position. NOTE: This is only valid for helicopters. 
Feet (ft)  
CG FEET AFT LIMIT 
The aft CG limit position relative to the Reference Datum Position. NOTE: This is only valid for helicopters. 
Feet (ft)  
CG FEET LATERAL 
The lateral CG position relative to the Reference Datum Position. NOTE: This is only valid for helicopters. 
Feet (ft)  
CG FEET LATERAL LEFT LIMIT 
The left hand lateral CG position relative to the Reference Datum Position. NOTE: This is only valid for helicopters. 
Feet (ft)  
CG FEET LATERAL RIGHT LIMIT 
The right hand lateral CG position relative to the Reference Datum Position. NOTE: This is only valid for helicopters. 
Feet (ft)  
CG FEET FWD LIMIT 
The forward CG limit position relative to the Reference Datum Position. NOTE: This is only valid for helicopters. 
Feet (ft)  
CG FWD LIMIT 
Most forward authorized position of the CG according to the POH. NOTE: This is only valid for airplanes. 
Percent Over 100  
CG MAX MACH 
Deprecated, do not use!  Mach  
CG MIN MACH 
Deprecated, do not use!  Mach  
CG PERCENT 
Longitudinal CG position as a percent of reference Chord. NOTE: This is only valid for airplanes. 
Percent Over 100  
CG PERCENT LATERAL 
Lateral CG position as a percent of reference Chord. NOTE: This is only valid for airplanes. 
Percent Over 100  
STATIC CG TO GROUND 
Static CG position with reference to the ground. NOTE: This is only valid for airplanes. 
Feet (ft) 
Interactive Points
Simulation Variable  Description  Units  Settable 

INTERACTIVE POINT BANK 
Interactive Point orientation: Bank  Degrees  
INTERACTIVE POINT HEADING 
Interactive Point orientation: Heading  Degrees  
INTERACTIVE POINT JETWAY LEFT BEND 
Interactive Point Jetway constant, determining the desired left bend ratio of jetway hood  Percent  
INTERACTIVE POINT JETWAY LEFT DEPLOYMENT 
Interactive Point Jetway constant, determining the desired left deployment angle of jetway hood  Degrees  
INTERACTIVE POINT JETWAY RIGHT BEND 
Interactive Point Jetway constant, determining the desired right bend ratio of jetway hood  Percent  
INTERACTIVE POINT JETWAY RIGHT DEPLOYMENT 
Interactive Point Jetway constant, determining the desired right deployment angle of jetway hood  Degrees  
INTERACTIVE POINT JETWAY TOP HORIZONTAL 
Interactive Point Jetway constant, determining the desired top horizontal ratio of displacement of jetway hood  Percent  
INTERACTIVE POINT JETWAY TOP VERTICAL 
Interactive Point Jetway constant, determining the desired top vertical ratio of displacement of jetway hood  Percent  
INTERACTIVE POINT GOAL 
The Interactive Point goal percentage of opening (if it's for a door) or percentage of deployment (if it's for a hose or cable).  Percent Over 100  
INTERACTIVE POINT OPEN 
Interactive Point current percentage of opening (if door) or deployment (if hose/cable)  Percent Over 100  
INTERACTIVE POINT PITCH 
Interactive Point orientation: Pitch  Degrees  
INTERACTIVE POINT POSX 
Interactive Point X position relative to datum reference point  Feet (ft)  
INTERACTIVE POINT POSY 
Interactive Point Y position relative to datum reference point  Feet (ft)  
INTERACTIVE POINT POSZ 
Interactive Point Z position relative to datum reference point  Feet (ft)  
INTERACTIVE POINT TYPE 
The type of interactive point 
Enum:

Weight
Simulation Variable  Description  Units  Settable 

EMPTY WEIGHT 
Empty weight of the aircraft  Pounds  
EMPTY WEIGHT CROSS COUPLED MOI 
Empty weight cross coupled moment of inertia  Slugs per feet squared (Slug sqft)  
EMPTY WEIGHT PITCH MOI 
Empty weight pitch moment of inertia  Slugs per feet squared (Slug sqft)  
EMPTY WEIGHT ROLL MOI 
Empty weight roll moment of inertia  Slugs per feet squared (Slug sqft)  
EMPTY WEIGHT YAW MOI 
Empty weight yaw moment of inertia  Slugs per feet squared (Slug sqft)  
MAX GROSS WEIGHT 
Maximum gross weight of the aircaft  Pounds  
TOTAL WEIGHT 
Total weight of the aircraft  Pounds  
TOTAL WEIGHT CROSS COUPLED MOI 
Total weight cross coupled moment of inertia  Slugs per feet squared  
TOTAL WEIGHT PITCH MOI 
Total weight pitch moment of inertia  Slugs per feet squared  
TOTAL WEIGHT ROLL MOI 
Total weight roll moment of inertia  Slugs per feet squared  
TOTAL WEIGHT YAW MOI 
Total weight yaw moment of inertia  Slugs per feet squared 