""" Author: M. Graham Macy Edited: 8/5/2024 Description: Containts constants that may or may not be accurate. Guesses and assumptions are marked. Arbitrary decisions are marked. """ ########################################################################### # Data Files ########################################################################### airport_filename = "airportData.csv" schedule_filename = "flightSchedule.csv" ########################################################################### # Aircraft Constants ########################################################################### MGTOW_737_8_lbs = 174_200 MGTOW_737_9_lbs = 174_200 OEW_737_8_lbs = 90_710 OEW_737_9_lbs = 93_680 BOW_737_8_lbs = OEW_737_8_lbs + 1_000 # basic operating weight # (OEW + crew, oil, equipment) # no reference, just a guess L_D_max_737 = 17 fuel_capacity_lbs = 6_875 ZFW_lbs = 138_300 # max zero fuel weight reserve_fuel_lbs = 1_500 # just a guess LGW_lbs = ZFW_lbs + reserve_fuel_lbs # just a guess for reserve fuel num_passengers = 177 # REFERENCE? passenger_weight_lbs = 210 ########################################################################### # Flight Constants ########################################################################### taxi_time_hrs = 0.25 # just a guess ground_time_hrs = 1.5 sound_speed_ft_s_FL37 = 968 Mach_cruise = 0.793 SFC_s_nmi = 9.09654*10 ** -3 # calculated from Breguet Range Eq ########################################################################### # Scientific Constants ########################################################################### ft_per_nmi = 6076.11549 sec_per_hour = 3600 hrs_per_day = 24 g_ft_s2 = 31.2 ########################################################################### # Flight Ops Policy Constants ########################################################################### range_max_nmi = 2000 range_min_nmi = 500 max_daily_op_hrs = 16 ########################################################################### # Engine Maintenance Constants ########################################################################### # LLP limits of Fan-LPC, Core, LPT defined by OEM fan_limit = 30_000 # REFERENCE core_limit = 20_000 # REFERENCE lpt_limit = 25_000 # REFERENCE cr_threshold = 150 # arbitrary new_eng_cycles = 300 old_eng_cycles = 15000 EGTM_limit_degC = 20 # arbitrary # maintenance time engine_swap_aog_hrs = 3 # assume 3 hours for an engine swap """ References: -constant velocity of Mach 0.793 at 37000 ft (source: https://aviation.stackexchange.com/questions/67582/what-is-the-typical-fuel-consumption-of-a-737-in-mpg#67603) -Speed of sound at 37000 ft: 968 ft/s (source: https://www.engineeringtoolbox.com/elevation-speed-sound-air-d_1534.html) -Lift-to-drag ratio of B737 of 17 (extrapolated from graphs here: https://web.mit.edu/16.unified/www/FALL/Unified_Concepts/Breguet-Range-U2-notes-Fall08(2).pdf) -SFC of B737 calculated to make the units work (s/nmi) -SFC Calculated with Breguet range equation and information about max range, OEW, and MGTOW from source: https://planenerd.com/range-of-boeing-737/#737-next-generation-range -Weights from here: https://www.boeing.com/content/dam/boeing/boeingdotcom/commercial/services/assets/brochure/737_800BCF.pdf """