NASA STI Repository (National Aeronautics and Space Administration) · 1980 · 11 citations · 0 references
Open access
EngineeringAerospace EngineeringSystems EngineeringAircraft DesignCost AccountingCost ManagementCost AnalysisCost Data CollectionCost EstimationCost MeasurementManufacturing Cost AnalysisWeight EstimationAircraft Weight EstimationConcept EvaluationEquipment Weight EstimationParametric Cost EstimationPreliminary Design Weight EstimationProduction Cost AnalysisProduction Cost Budgeting
Weight estimating relationships (WERs) and recurring production cost estimating relationships (CERs) were developed for helicopters at the system level. The WERs estimate system level weight based on performance or design characteristics which are available during concept formulation or the preliminary design phase. The CER (or CERs in some cases) for each system utilize weight (either actual or estimated using the appropriate WER) and production quantity as the key parameters.