Aug. 18, 2016
Engine Test Shows Design Ready for New Era
Test jednego z silników RL10 wg wstępnych ocen był udany.
Silniki tego typu posłużą do wynoszenia na orbitę Starlinerów rakietą nośną Atlas V.
Przebiegowi testu przypatrywała się trojka astronautów wyznaczonych do lotów testowych komercyjnych statków.
Steam billowed from the test stand in West Palm Beach, Florida, for about six minutes as the engine burned a combination of liquid hydrogen and liquid oxygen to produce some 22,300 pounds of thrust. Bolted into place inside a vacuum chamber, the engine was shut down and then re-ignited just as it will be when it is pushing a spacecraft into orbit.
With four cameras transmitting from inside the vacuum chamber where the rocket engine fired, the astronauts and test team watched icicles form on the rim of the nozzle even as the fiery hot gas exited less than an inch away. Frost even formed on the walls of the engine because of the super-cold hydrogen and oxygen propellants coursing through the engine's turbopumps and plumbing. Frost doesn't form on the engines in space since there is no moisture available like there is in Florida. (...)
Although RL10s have been in use for more than 50 years and propelled NASA probes to distant worlds including the New Horizons spacecraft that surveyed Pluto for the first time last year, the engines have not been used on flights carrying people.
https://www.nasa.gov/feature/engine-test-shows-design-ready-for-new-era