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AcknowledgementsAnalyses show that dual-expander nozzles proThe sum of the divergence duce high performance. thrust loss and the boundary layer thrust loss for between 1.0 and 2.0 percent in either of the operperformance of the dual-expander nozzle is not This work was supported by the Air Force Astronautics Laboratory, under contract F04611-86-a typical nozzle geometry was calculated to be C-0113, Qual Expander Engine Thrust Chamber Technology. The AFAL program manager is ation modes. The analyses also show that the Lt. A. Bartholomew, the ATC program manager is Mr. A. Kobayashi, and the ATC project engineers very sensitive to the various parameters that are Mr. 0. Vice and Mr. C. O'Brien.define the geometry of the nozzle.

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