ON THE COVER:
Pratt & Whitney Rocketdyne’s SJX61-2 dual-mode ramjet/scramjet completes a high-Mach run inside NASA Langley’s 8-ft. high-temperature tunnel (see p. 62). The tests were conducted to clear the fuel-cooled engine to power Boeing’s X-51A WaveRider hypersonic demonstrator when it flies next year. The...
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