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sim/
sim/flightmodel/
sim/flightmodel/engine/
sim/flightmodel/engine/ENGN_CHT[16]
float as a ratio
v7.50.0+
Cylinder Head Temperature (ratio from min to max) - use sim/flightmodel2/engines/actuators/CHT_deg_cel
sim/flightmodel/engine/ENGN_CHT_c[16]
float in degc_or_f
v7.50.0+
CHT (per engine in degrees - units depend on plane, label wrong - use sim/flightmodel2/engines/actuators/CHT_deg_cel
sim/flightmodel/engine/ENGN_CHT_CYL_c[192]
float in degc_or_f
v12.0.0+
CHT (per engine in degrees - units depend on plane, label wrong. Up to 12 cylinders - use use sim/flightmodel2/engines/actuators/CHT_CYL_cel Dimension is 192.
sim/flightmodel/engine/ENGN_EGT[16]
float as a ratio
v6.60.0+
Exhaust Gas Temperature (ratio from min to max) - use sim/flightmodel2/engines/actuators/EGT_deg_cel
sim/flightmodel/engine/ENGN_EGT_c[16]
float in degc_or_f
v7.40.0+
EGT (per engine) in degrees - units depend on plane, label wrong - use sim/flightmodel2/engines/actuators/EGT_deg_cel
sim/flightmodel/engine/ENGN_EGT_CYL_c[192]
float in degc_or_f
v12.0.0+
EGT (per engine) in degrees - units depend on plane, label wrong. Up to 12 cylinders - use use sim/flightmodel2/engines/actuators/EGT_CYL_cel Dimension is 192.
sim/flightmodel/engine/ENGN_ITT[16]
float as a ratio
v6.60.0+
Interturbine Temperature per engine (ratio from min to max, min = 0, max = 700) - use sim/flightmodel2/engines/actuators/ITT_deg_cel
sim/flightmodel/engine/ENGN_ITT_c[16]
float in degc_or_f
v7.40.0+
ITT (per engine) in degrees - units depend on plane, label wrong - use sim/flightmodel2/engines/actuators/ITT_deg_cel
sim/flightmodel2/
sim/flightmodel2/engines/
Datarefs for the physical engines, props and rotors.
sim/flightmodel2/engines/afterburner_on
int as a boolean
v9.0.0+
Afterburner on, yes or no. Dimension is by engine.
sim/flightmodel2/engines/afterburner_ratio
float as a ratio
v9.0.0+
Afterburner engaged ratio, 0.0 to 1.0. Dimension is by engine.
sim/flightmodel2/engines/CHT_CYL_cel[192]
float in degc
v12.0.8+
CHT (per engine per cylinder) in degrees celius Dimension is 192.
sim/flightmodel2/engines/CHT_deg_C
float in degrees
v11.30.0+
CHT (per engine) in degrees C - use sim/flightmodel2/engines/actuators/CHT_deg_cel Dimension is by engine.
sim/flightmodel2/engines/CHT_deg_cel[16]
float in degc
v12.0.8+
CHT (per engine) in degrees celcius
sim/flightmodel2/engines/EGT_CYL_cel[192]
float in degc
v12.0.8+
EGT (per engineper cylinder) in degrees celius. Up to 12 cylinders Dimension is 192.
sim/flightmodel2/engines/EGT_deg_C
float in degrees
v11.30.0+
EGT (per engine) in degrees C - use sim/flightmodel2/engines/actuators/EGT_deg_cel Dimension is by engine.
sim/flightmodel2/engines/EGT_deg_cel[16]
float in degc
v12.0.8+
EGT (per engine) in degrees celcius
sim/flightmodel2/engines/engine_burning_fuel_ratio
int as a ratio
v9.0.0 - v9.2.0
Engine running ratio, 0.0 for not running to 1.0 for fully running, combustion process fully started. Dimension is by engine.
sim/flightmodel2/engines/engine_fuel_in_intake
float as a ratio
v10.31.0+
How much fuel has been primed into the intake port (fuel-injected engine) 0..1 Dimension is by engine.
sim/flightmodel2/engines/engine_is_burning_fuel
int as a boolean
v9.0.0+
Engine is currently burning fuel, yes or no. Dimension is by engine.
sim/flightmodel2/engines/engine_rotation_angle_deg
float in degrees
v9.0.0+
Angle of the engine crank shaft as it turns over, running 0 to 360 over and over again in normal operation. Engine speed can be different than prop rotation speed in clutched designs. Dimension is by engine.
sim/flightmodel2/engines/engine_rotation_speed_rad_sec
float in radians/second
v9.0.0+
Rotational speed of the engine crank shaft, in radians per second. Dimension is by engine.
sim/flightmodel2/engines/engn_exhaust_speed_msc
float in meters/second
v12.0.0+
speed of exhaust velocity out of engine nozel relative to aircraft frame of reference Dimension is by engine.
sim/flightmodel2/engines/EPR_FADEC
float as a ratio
v12.0.5+
Target EPR the fadec is limiting to Dimension is by engine.
sim/flightmodel2/engines/fuel_pump_spinning
float in 0..1
v10.50.0+
Is the electric fuel pump for this engine spinning? 1 = yes, 0 = no. Dimension is by engine.
sim/flightmodel2/engines/has_fuel_flow_after_mixture
int as a boolean
v9.0.0+
Engine has fuel making to the combustion process, yes or no. Dimension is by engine.
sim/flightmodel2/engines/has_fuel_flow_before_mixture[16]
int as a boolean
v9.0.0+
Engine has fuel making to the mixture control, yes or no. Writable if override_fuel_system is true.
sim/flightmodel2/engines/is_on_fire[16]
float in 0..1
v11.30.0+
Engine fire, 0 means none, 1 means max.
sim/flightmodel2/engines/ITT_deg_C
float in degrees
v11.30.0+
ITT (per engine) in degrees C - use sim/flightmodel2/engines/actuators/ITT_deg_cel Dimension is by engine.
sim/flightmodel2/engines/ITT_deg_cel[16]
float in degc
v12.0.8+
ITT (per engine) in degrees celcius
sim/flightmodel2/engines/jetwash_mtr_sec
float in meters/second
v11.30.0+
Speed of jetwash behind the engine exhaust in meters/second Dimension is by engine.
sim/flightmodel2/engines/location_x_mtr
float in meters
v9.0.0+
Engine location, meters x, y, z, with respect to the default center of gravity. Dimension is by prop.
sim/flightmodel2/engines/location_y_mtr
float in meters
v9.0.0+
Engine location, meters x, y, z, with respect to the default center of gravity. Dimension is by prop.
sim/flightmodel2/engines/location_z_mtr
float in meters
v9.0.0+
Engine location, meters x, y, z, with respect to the default center of gravity. Dimension is by prop.
sim/flightmodel2/engines/N1_FADEC
float in percent
v12.0.0+
Target N1 the fadec is limiting to Dimension is by engine.
sim/flightmodel2/engines/N1_percent
float in percent
v11.30.0+
N1 speed as percent of max (per engine) Dimension is by engine.
sim/flightmodel2/engines/N2_percent
float in percent
v11.30.0+
N2 speed as percent of max (per engine) Dimension is by engine.
sim/flightmodel2/engines/nacelle_vertical_angle_deg
float in degrees
v9.0.0 - v11.99.0
This engine nacelle vertical vector, in degrees, where 0 is straight forwards, 90 is straight up. Dimension is by prop.
sim/flightmodel2/engines/nozzle_speed_msc
float in meters/second
v12.0.0+
speed of exhaust velocity out of engine nozel relative to aircraft frame of reference Dimension is by engine.
sim/flightmodel2/engines/prop_angle_deg
float in degrees
v12.0.0+
Angle of the prop or engine-fan as it rotates. This is the physical value for simulating the aircraft and is part of the engine flight modeling, and is not used to customize rendering. Writable in v12 Dimension is by prop.
sim/flightmodel2/engines/prop_brownout_ratio[16]
float in Pointers
v12.1.0+
Brownout effect ratio for this rotor
sim/flightmodel2/engines/prop_cone_angle_rad
float in radians
v9.0.0+
Coning angle of the disc, in radians. Typically close to 0.0. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/
Datarefs for customizing prop disc visualization.
sim/flightmodel2/engines/prop_disc/disc_alpha_front
float as a ratio
v9.40.0+
Alpha of prop disc when viewed from front. X-Plane interpolates as the view angle moves. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/disc_alpha_inside
float as a ratio
v9.40.0+
Ratio to multiply disc alpha when view is inside the airplane. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/disc_alpha_side
float as a ratio
v9.40.0+
Alpha of prop disc when viewed of side. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/disc_length_ratio
float as a ratio
v11.50.0+
Ratio to scale the length of the side image. 1.0 = the real length of the prop. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/disc_s
float in offset
v9.40.0+
Offset from left (in 'slots') for the prop disc texture. Fractions blend horizontal images. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/disc_s_dim
int in count
v9.40.0+
Number of horizontal slots for the prop disc in the prop disc texture Dimension is by prop.
sim/flightmodel2/engines/prop_disc/disc_t
int in offset
v9.40.0+
Offset from bottom (in 'slots') for the prop disc texture Dimension is by prop.
sim/flightmodel2/engines/prop_disc/disc_t_dim
int in count
v9.40.0+
Number of vertical slots for the prop disc in the prop disc texture Dimension is by prop.
sim/flightmodel2/engines/prop_disc/disc_width
float in meters
v9.40.0+
If larger than zero, the prop disc is actually two discs, with this separation at the root and no separation at the tip. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/override[16]
int as a boolean
v9.30.0+
Set to 1 to control the prop disc from a plugin. Overrides all other variables in this section.
sim/flightmodel2/engines/prop_disc/side_alpha_front
float as a ratio
v9.40.0+
Alpha of prop side when viewed from front. X-Plane interpolates as the view angle moves. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_alpha_inside
float as a ratio
v9.40.0+
Ratio to multiply side alpha when view is inside the airplane. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_alpha_side
float as a ratio
v9.40.0+
Alpha of prop side when viewed of side. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_alpha_to_camera
float as a ratio
v9.40.0+
A ratio to multiply side alpha when the rotor is extending toward the camera. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_angle
float in degrees
v9.40.0+
Rotation angle of the side images now - allows side to rotate independently of disc, perhaps faster. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_is_billboard
int as a boolean
v9.40.0+
If true, prop side angle comes from billboarding logic - if false, it comes from side_angle dataref. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_length_ratio
float as a ratio
v9.40.0+
Ratio to scale the length of the side image. 1.0 = the real length of the prop. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_number_of_blades
int in count
v9.40.0+
Number of side blades to draw. Should be at least 2! Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_s
float in offset
v9.40.0+
Offset from left (in 'slots') for the prop disc texture. Fractions blend horizontal images. Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_s_dim
int in count
v9.40.0+
Number of horizontal slots for the prop side in the prop disc texture Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_t
int in offset
v9.40.0+
Offset from bottom (in 'slots') for the prop disc texture Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_t_dim
int in count
v9.40.0+
Number of vertical slots for the prop side in the prop disc texture Dimension is by prop.
sim/flightmodel2/engines/prop_disc/side_width
float in meters
v9.40.0+
Width of prop side image in meters. Height comes from prop radius. Dimension is by prop.
sim/flightmodel2/engines/prop_is_disc
int as a boolean
v9.30.0+
Is the prop a disc now? Override with /prop_disc/override per engine! Dimension is by prop.
sim/flightmodel2/engines/prop_no_disc_rotation_angle_deg
float in degrees
v10.50.0+
Angle of the prop or engine-fan as it rotates. You will see this value circulate 0 to 360 degrees over and over as the engine runs and the prop or fan turns. This dataref NEVER shows the speed of the prop disc if it happens to be showing. You can override this to modify rendering. Override witih /prop_disc/override per engine! Dimension is by prop.
sim/flightmodel2/engines/prop_pitch_deg
float in degrees
v9.0.0+
ACTUAL pitch of the prop in degrees from its flat-pitch setting. Dimension is by prop.
sim/flightmodel2/engines/prop_rotation_angle_deg
float in degrees
v9.0.0+
Angle of the prop or engine-fan as it rotates. You will see this value circulate 0 to 360 degrees over and over as the engine runs and the prop or fan turns. If the prop looks like a blurry disc, this is how fast the blurry disc is 'spinning'. Override with /prop_disc/override per engine! Dimension is by prop.
sim/flightmodel2/engines/prop_rotation_speed_rad_sec
float in radians/second
v9.0.0+
Radians per second rotation speed of the prop. Dimension is by prop.
sim/flightmodel2/engines/prop_tip_deflection_degrees[16]
float in degrees
v10.0.0+
Degrees of deflection of a line from the crank shaft to the prop tip.
sim/flightmodel2/engines/propwash_mtr_sec
float in meters/second
v12.0.0+
Speed of propwash behind the prop disc in meters/second Dimension is by prop.
sim/flightmodel2/engines/prop_whiteout_ratio[16]
float in Pointers
v12.1.0+
Whiteout effect ratio for this rotor
sim/flightmodel2/engines/rotor_blade_alpha_deg
float in degrees
v12.0.0+
Blade alpha is the dynamic-pressure-weighted average of all element angles of attack of the rotor blades. Expect blade slap as these numbers approach stall, if the disc angle of attack is near zero, so the vortices are not being cleared form the disc. Dimension is by prop.
sim/flightmodel2/engines/rotor_blade_slap_rat
float as a ratio
v12.0.0+
Disc slap is the audio slappping sound that happens when the blades of a rotor encounter the tip vortices of the blade in front of them. This happens when the rotor blades are at a high angle of attack, shedding large vortices, and the disc as at a low angle of attack, causing those vortices to not clear the disc vertically. Dimension is by prop.
sim/flightmodel2/engines/rotor_cyclic_aileron_tilt_deg
float in unspecified units
v12.0.0+
Dimension is by prop.
sim/flightmodel2/engines/rotor_cyclic_elevator_tilt_deg
float in unspecified units
v12.0.0+
Dimension is by prop.
sim/flightmodel2/engines/rotor_disc_alpha_deg
float in degrees
v12.0.0+
Disc alpha is the anlge of attack of the rotor disc, after adding the influence of downwash through the disc. When this angle of attack is near zero, vortices from one blade will indeed interact with the next blade coming, since air is not being cleared out of the disc in the vertical axis! Dimension is by prop.
sim/flightmodel2/engines/rotor_radius_mtr[16]
float in meters
v12.1.0+
Radius of the rotor disc
sim/flightmodel2/engines/rotor_side_cyclic_deg
float in degrees
v9.0.0 - v11.99.0
This engine rotor-disc lateral cyclic, in degrees, where -10 is 10 degrees left, 10 is 10 degrees right. Dimension is by prop.
sim/flightmodel2/engines/rotor_vertical_cyclic_deg
float in degrees
v9.0.0 - v11.99.0
This engine rotor-disc longitudinal cyclic, in degrees, where -10 is 10 degrees forwards, 10 is 10 degrees aft. Dimension is by prop.
sim/flightmodel2/engines/rotor_vertical_vector_deg
float in degrees
v9.0.0 - v11.99.0
This engine rotor-disc vertical vector, in degrees, where 0 is straight forwards, 90 is straight up. Dimension is by prop.
sim/flightmodel2/engines/side_sign[16]
float in -1,0,1
v11.30.0+
Sign of the side of the ACF for this engine: -1 for left side, 0 for inline, 1 for right side
sim/flightmodel2/engines/starter_is_running[16]
int as a boolean
v11.0.0+
Is this starter running at all
sim/flightmodel2/engines/starter_making_torque[16]
int as a boolean
v11.0.0+
Is this starter applying torque to the engine
sim/flightmodel2/engines/throttle_used_ratio
float as a ratio
v9.0.0+
Throttle that is actually going to the engine, which could be different than the commanded throttle due to FADEC throttle adjustments. Dimension is by engine.
sim/flightmodel2/engines/thrust_reverser_deploy_ratio
float as a ratio
v9.0.0+
How far the reverser doors/mechanism have traveled. 0 = fully stowed, 1.0 = fully deployed. Dimension is by engine.