Aero input and outputs

Properties aerodynamic functions in JSBSim can read and output.

Function inputs

Location of the aerodynamic reference point in the aircraft structural frame, measured in inches:

   /fdm/jsbsim/metrics/aero-rp-x-in
   /fdm/jsbsim/metrics/aero-rp-y-in
   /fdm/jsbsim/metrics/aero-rp-z-in

Maximum and minimum alpha (angle of attack) in degrees:

   /fdm/jsbsim/aero/alpha-max-deg
   /fdm/jsbsim/aero/alpha-min-deg

Wing span/(2*Velocity)

   /fdm/jsbsim/aero/bi2vel

Wing chord/(2*Velocity)

   /fdm/jsbsim/aero/ci2vel

Alpha of the wing in radians (includes the angle of incidence of the wing, if input):

   /fdm/jsbsim/aero/alpha-wing-rad

Altitude of CG divided by wing span:

   /fdm/jsbsim/aero/h_b-cg-ft

Altitude of MAC divided by wing span:

   /fdm/jsbsim/aero/h_b-mac-ft

Aerodynamic rotational rates in rad/sec (includes wind effects, if any):

   /fdm/jsbsim/velocities/p-aero-rad_sec
   /fdm/jsbsim/velocities/q-aero-rad_sec
   /fdm/jsbsim/velocities/r-aero-rad_sec

Aerodynamic velocities in ft/sec (includes wind effects, if any):

   /fdm/jsbsim/velocities/u-aero-fps
   /fdm/jsbsim/velocities/v-aero-fps
   /fdm/jsbsim/velocities/w-aero-fps

The body axis aerodynamic force vector of the aircraft in lbs:

   /fdm/jsbsim/forces/fbx-aero-lbs
   /fdm/jsbsim/forces/fby-aero-lbs
   /fdm/jsbsim/forces/fbz-aero-lbs

The stability axis aerodynamic force vector of the aircraft in lbs:

   /fdm/jsbsim/forces/fwx-aero-lbs
   /fdm/jsbsim/forces/fwy-aero-lbs
   /fdm/jsbsim/forces/fwz-aero-lbs

The body axis aerodynamic moment vector of the aircraft in ft-lbs:

   /fdm/jsbsim/moments/l-aero-lbsft
   /fdm/jsbsim/moments/m-aero-lbsft
   /fdm/jsbsim/moments/n-aero-lbsft

The lift coefficient squared:

   /fdm/jsbsim/aero/cl-squared

Dynamic pressure times reference area:

   /fdm/jsbsim/aero/qbar-area

Angles of attack and sideslip in radians and degrees (and the magnitudes):

   /fdm/jsbsim/aero/alpha-rad
   /fdm/jsbsim/aero/beta-rad
   /fdm/jsbsim/aero/mag-beta-rad
   /fdm/jsbsim/aero/alpha-deg
   /fdm/jsbsim/aero/beta-deg
   /fdm/jsbsim/aero/mag-beta-deg

Dynamic pressure in psf:

   /fdm/jsbsim/aero/qbar-psf

Dynamic pressure in the body axis XZ plane:

   /fdm/jsbsim/aero/qbarUW-psf

Dynamic pressure in the body axis XY plane:

   /fdm/jsbsim/aero/qbarUV-psf

Others:

   /fdm/jsbsim/metrics/cbarw-ft
   /fdm/jsbsim/metrics/bw-ft

Function outputs

Ground effect factors for lift and drag:

   /fdm/jsbsim/aero/function/ground-effect-factor-lift
   /fdm/jsbsim/aero/function/ground-effect-factor-drag

Runtime-created aerodynamic force and moment components from definitions in the <aerodynamics> section of the configuration file (varies per-aircraft):

Lift coefficients:

   /fdm/jsbsim/aero/coefficient/CL        -       Lift coefficient
   /fdm/jsbsim/aero/coefficient/CLwbh
   /fdm/jsbsim/aero/coefficient/CLDf
   /fdm/jsbsim/aero/coefficient/CLDe
   /fdm/jsbsim/aero/coefficient/CLadot
   /fdm/jsbsim/aero/coefficient/CLq
   /fdm/jsbsim/aero/coefficient/CLDsb     -       Lift coefficient of airbrake
   /fdm/jsbsim/aero/coefficient/CLDflaps  -       Lift coefficient of flaps

Drag coefficients:

   /fdm/jsbsim/aero/coefficient/CD        -       Drag coefficient
   /fdm/jsbsim/aero/coefficient/CDo
   /fdm/jsbsim/aero/coefficient/CDDf
   /fdm/jsbsim/aero/coefficient/CDwbh
   /fdm/jsbsim/aero/coefficient/CDDe
   /fdm/jsbsim/aero/coefficient/CDbeta
   /fdm/jsbsim/aero/coefficient/CDDsb     -       Drag coefficient of airbrake
   /fdm/jsbsim/aero/coefficient/CDgear    -       Drag coefficient of gear
   /fdm/jsbsim/aero/coefficient/CDDflaps  -       Drag coefficient of flaps

Side force coefficients:

   /fdm/jsbsim/aero/coefficient/CYb       -       Side Force coefficient due to Sideslip
   /fdm/jsbsim/aero/coefficient/CYda
   /fdm/jsbsim/aero/coefficient/CYdr
   /fdm/jsbsim/aero/coefficient/CYp
   /fdm/jsbsim/aero/coefficient/CYr

Roll moment coefficients:

   /fdm/jsbsim/aero/coefficient/Clb
   /fdm/jsbsim/aero/coefficient/Clp
   /fdm/jsbsim/aero/coefficient/Clr
   /fdm/jsbsim/aero/coefficient/Clda
   /fdm/jsbsim/aero/coefficient/Cldr

Pitch moment coefficients:

   /fdm/jsbsim/aero/coefficient/Cmalpha
   /fdm/jsbsim/aero/coefficient/CmDf
   /fdm/jsbsim/aero/coefficient/Cmq
   /fdm/jsbsim/aero/coefficient/Cmadot
   /fdm/jsbsim/aero/coefficient/Cmo
   /fdm/jsbsim/aero/coefficient/Cmde
   /fdm/jsbsim/aero/coefficient/CmDsb         -

Yaw moment coefficients:

   /fdm/jsbsim/aero/coefficient/Cnb
   /fdm/jsbsim/aero/coefficient/Cnp
   /fdm/jsbsim/aero/coefficient/Cnr
   /fdm/jsbsim/aero/coefficient/Cnda
   /fdm/jsbsim/aero/coefficient/Cndr

Stall hysteresis, normalized:

   /fdm/jsbsim/aero/stall-hyst-norm

Time rate of change in alpha and sideslip in deg/sec and rad/sec:

   /fdm/jsbsim/aero/alphadot-rad_sec
   /fdm/jsbsim/aero/betadot-rad_sec
   /fdm/jsbsim/aero/alphadot-deg_sec
   /fdm/jsbsim/aero/betadot-deg_sec