An analysis is presented for designing and predicting the performance of compressed truncated perfect nozzles. A study was performed to determine the relative merits of such nozzles compared to Rao nozzles. It was found that Rao nozzles always yield higher performance than compressed truncated perfect nozzles. However, the performance differences are quite small (0.04-0.34%), which shows that compressed truncated perfect nozzles are good propulsive nozzles. For nozzle envelopes for which the Rao nozzle design concept fails, compressed truncated perfect nozzles may yield very efficient nozzle designs.
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Joe D. Hoffman (1987) studied this question.
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