def takeoff_field_length(interface):
# import tofl analysis module
estimate_tofl = SUAVE.Methods.Performance.estimate_take_off_field_length
# unpack data
analyses = interface.analyses
missions = interface.analyses.missions
config = interface.configs.takeoff
# defining required data for tofl evaluation
takeoff_airport = missions.base.airport
ref_weight = config.mass_properties.takeoff
weight_max = config.mass_properties.max_takeoff
weight_min = config.mass_properties.operating_empty
# evaluate
try:
del config.maximum_lift_coefficient
except: pass
# weight vector to eval tofl
weight_vec = np.linspace(weight_min,weight_max,10)
takeoff_field_length = np.zeros_like(weight_vec)
# loop of tofl evaluation
for idw,weight in enumerate(weight_vec):
config.mass_properties.takeoff = weight
takeoff_field_length[idw] = estimate_tofl(config,analyses, takeoff_airport)
# return initial value for takeoff weight
config.mass_properties.takeoff = ref_weight
# pack results
results = Data()
results.takeoff_field_length = takeoff_field_length
results.takeoff_weights = weight_vec
return results
