Crossword-Solution: SCRAMJETS 9 letters, 1 clue 🏆 scrabble score: 20

The liquid air cycle equipment would be using the cryogenic hydrogen fuel to chill and liquefy the rush of incoming air; oxygen would then be injected into the scramjets at pressures impossible to achieve in conventional engines.

Until the operational shakedown, nobody actually knew whether or not those damned scramjets would produce a standing shock wave in their combustion chamber, creating a supersonic "compressor" the way the supercomputer promised they would.

Who were they fooling? The ultimate weapons delivery system had just been built here, a high-tech behemoth that married advanced Soviet thruster and guidance technology with a hypersonic airframe and scramjets created by the world's leading manufacturer of high-temperature alloys and supercomputers.

Indeed, Mitsubishi's Nagoya Aircraft Works was the ideal choice to manufacture the air-breathing turboramjets-scramjets for the vehicle.

The massive scramjets for this project had been manufactured in Nagoya under a veil of total secrecy, then static-tested at their aeropropulsion test facility and individually shipped here to Hokkaido in unmarked railcars.