def evaluate_field_length(vehicle):
# ---------------------------
# Check field performance
# ---------------------------
# define takeoff and landing configuration
#print ' Defining takeoff and landing configurations'
takeoff_config,landing_config = define_field_configs(vehicle)
# define airport to be evaluated
airport = SUAVE.Attributes.Airports.Airport()
airport.altitude = 0.0 * Units.ft
airport.delta_isa = 0.0
airport.atmosphere = SUAVE.Attributes.Atmospheres.Earth.US_Standard_1976()
# evaluate takeoff / landing
#print ' Estimating takeoff performance'
TOFL = estimate_take_off_field_length(vehicle,takeoff_config,airport)
#print ' Estimating landing performance'
LFL = estimate_landing_field_length(vehicle,landing_config,airport)
fldlength = Data()
fldlength.TOFL = TOFL
fldlength.LFL = LFL
return fldlength
