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A Thermodynamic analytical program has been developed to help investigate the impact of power system requirements on Tactical Aircraft (TA) and Unmanned Aerial Vehicle (UAV) performance. The Visual Basic for Applications (VBA) program has a user interface that operates in MS-Excel, linking several subsystem analysis programs for execution and data transfer in the power systems analysis. The analytical model is configured to include a UAV encoded propulsion engine cycle code, which allows the inspection of power extraction effects on engine performance. The model was benchmarked by validating the results of the encoded engine program for a TA with an investigation of the separate effects of shaft power extraction and pneumatic bleed air power extraction of power. The selected engine cycle for this purpose was that of the standard TA fighter. The altitude was varied from sea level (SL) to 40,000 ft with a constant Mach number of 0.9.

A computerized thermodynamic analytical program is being developed to help investigate the impact of power system requirements on aircraft performance. The Visual Basic for Applications (VBA) program has a user interface that operates in MS-EXCEL, linking several subsystem analysis programs for execution and data transfer in the power systems analysis. The program presently includes an encoded propulsion engine cycle code, which allows the inspection of power extraction effects on engine performance. To validate the results of the encoded engine program, a study was conducted to investigate the separate effects of shaft power extraction and pneumatic bleed. The selected engine cycle was that for a standard tactical fighter, with a flight condition of varied altitude (sea level to 40k-ft.) and constant Mach Number(0.9). As expected, the resultant data showed that the engine performance was more sensitive to pneumatic bleed than to shaft power extraction.