RCAIDE.Library.Methods.Mass_Properties.Weight_Buildups.Conventional.Transport.FLOPS.compute_operating_empty_weight

compute_operating_empty_weight#

compute_operating_empty_weight(vehicle, settings=None)[source]#
Main function that estimates the zero-fuel weight of a transport aircraft:

  • MTOW = WZFW + FUEL

  • WZFW = WOE + WPAYLOAD

  • WOE = WE + WOPERATING_ITEMS

  • WE = WSTRCT + WPROP + WSYS

Assumptions:

  1. All nacelles are identical

  2. The number of nacelles is the same as the number of engines

Source:

FLOPS method: The Flight Optimization System Weight Estimation Method

Inputs:
vehicle - data dictionary with vehicle properties [dimensionless]
-.networks: data dictionary with all the network elements and properties
-.total_weight: total weight of the propulsion system [kg]

(optional, calculated if not included)

-.fuselages: data dictionary with the fuselage properties of the vehicle -.wings: data dictionary with all the wing properties of the vehicle, including horzinotal and vertical stabilizers -.wings[‘main_wing’]: data dictionary with main wing properties

-.flap_ratio: flap surface area over wing surface area

-.mass_properties: data dictionary with all the main mass properties of the vehicle including MTOW, ZFW, EW and OEW

settings.weight_reduction_factors.

main_wing [dimensionless] (.1 is a 10% weight reduction) empennage [dimensionless] (.1 is a 10% weight reduction) fuselage [dimensionless] (.1 is a 10% weight reduction)

method_type - weight estimation method chosen, available:

  • FLOPS Simple

  • FLOPS Complex

Outputs:
output - data dictionary with the weight breakdown of the vehicle
-.structures: structural weight

-.wing: wing weight -.horizontal_tail: horizontal tail weight -.vertical_tail: vertical tail weight -.fuselage: fuselage weight -.main_landing_gear: main landing gear weight -.nose_landing_gear: nose landing gear weight -.nacelle: nacelle weight -.paint: paint weight -.total: total strucural weight

-.propulsion: propulsive system weight

-.engines: dry engine weight -.thrust_reversers: thrust reversers weight -.miscellaneous: miscellaneous items includes electrical system for engines and starter engine -.fuel_system: fuel system weight -.total: total propulsive system weight

-.systems: system weight

-.control_systems: control system weight -.apu: apu weight -.electrical: electrical system weight -.avionics: avionics weight -.hydraulics: hydraulics and pneumatic system weight -.furnish: furnishing weight -.air_conditioner: air conditioner weight -.instruments: instrumentation weight -.anti_ice: anti ice system weight -.total: total system weight

-.payload: payload weight

-.passengers: passenger weight -.bagage: baggage weight -.cargo: cargo weight -.total: total payload weight

-.operational_items: operational items weight

-.misc: unusable fuel, engine oil, passenger service weight and cargo containers -.flight_crew: flight crew weight -.flight_attendants: flight attendants weight -.total: total operating items weight

-.empty = structures.total + propulsion.total + systems.total -.operating_empty = empty + operational_items.total -.zero_fuel_weight = operating_empty + payload.total -.fuel = vehicle.mass_properties.max_takeoff - zero_fuel_weight

Properties Used:

N/A