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Trends in Technological Innovation 29 and treatment, and some approaches to LO design cause slight in- creases in aircraft weight and fuel usage. Because much of the tech- nology related to achieve low observability is varied, proprietary, and/or classified, little cost-estimating information is publicly avail- able. Therefore, although LO technology is already in use on a num- ber of military aircraft, estimators must rely on either cost informa- tion supplied by individual development programs (and those costs are also closely protected) or costs derived from activity-based or materials-based modeling. Integrally Bladed Rotors Integrally bladed rotors (IBRs), also called bladed disks or blisks, are one-piece units that make up the rotating portion of a fan or com- pressor stage of a jet engine. IBRs consist of several blades (airfoils) attached to a rotor that holds the blades in position and is attached to the other compressor/fan rotors and shaft in the engine. An IBR can be manufactured as a single part or the blades can be welded to the rotor during manufacturing. Currently, fan blades that are hollow for reduced weight are welded onto the rotor. IBRs are quickly be- coming the norm in newly developed fans and compressors. IBRs reduce the engine’s part count, weight, and aerodynamic losses, and eliminate each rotor blade’s traditional “dovetail” attachment Figure 3.1—Integrally Bladed Rotor (Blisk)PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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