ardupilot/Tools/autotest/models/freestyle.json

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# 5 inch FPV Freestyle/Racing model
{
# total vehicle mass in kg
"mass" : 0.8,
# vehicle diameter
"diagonal_size" : 0.25,
# the ref parameters should be taken from a test
# with the copter flying at constant speed in zero wind. This is used
# to estimate the drag coefficient
"refSpd" : 20.0, # m/s
"refAngle" : 45.0, # degrees
"refVoltage" : 23.2, # volts
"refCurrent" : 5, # Amps
"refAlt" : 607, # meters AMSL
"refTempC" : 25, # degrees C
"refBatRes" : 0.0226, # BAT.Res from log
# full battery voltage
"maxVoltage" : 25.2,
# full battery capacity, Ah
# 0 means unlimited
"battCapacityAh" : 0,
# MOT_THST_EXPO
"propExpo" : 0.7,
# approximate maximum yaw rate in deg/sec
"refRotRate" : 700,
# hover throttle from 0 to 1
"hoverThrOut" : 0.125,
# MOT_PWM_MIN
"pwmMin" : 1000,
# MOT_PWM_MAX
"pwmMax" : 2000,
# MOT_SPIN_MIN
"spin_min" : 0.01,
# MOT_SPIN_MAX
"spin_max" : 0.95,
# maximum motor slew rate, or zero to disable
"slew_max" : 0,
# total effective disc area in sq m for 4 x 5 inch diameter rotors
"disc_area" : 0.204,
# momentum drag coefficient
# ratio of momentum drag relative to a ducted rotor of the same effective disc area
"mdrag_coef" : 0.10,
# number of motors
"num_motors" : 4
}