A pair of high-speed concept vehicles under study by Stratolaunch could play a key role in the development of the company’s in-house-designed PGA liquid rocket engine as well as provide a valuable large-scale flying testbed for U.S. hypersonic developments. The testbeds could provide a bridge to Stratolaunch’s planned family of space launch vehicles, all of which are designed to be powered by the same baseline 200,000-lb.-thrust PGA engine. The family includes a series of ...

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