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F Morring JR, Hypersonic tests, Aviation Week & Space Technology, 6 February 2006, p 19

In US, Pratt & Whitney with NASA Langley are hot-fire testing the hypersonic Ground Demonstration Engine (GDE-2) in a wind tunnel at Mach 5. This is the first test of a hydrocarbon-fuelled scramjet using a single integrated flow path, with systems of fuel control and thermal management.
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