I haven't been following Sierra Nevada too closely, but this mentions that the testing included orbital transfer. Does anyone know how this was validated?
https://twitter.com/SierraSpaceCo/status/1598741068274700289I hope someone makes an article about this engine...
Our VR35K-A upper stage VORTEX engine, developed in conjunction with the @AFResearchLab, provides 35,000 lbf thrust and high specific impulse using liquid oxygen and liquid hydrogen for increased launch capability.Learn more: https://t.co/UtJanxkxtk#Space #Engine pic.twitter.com/ZYzkVi6JqR— Sierra Space (@SierraSpaceCo) December 2, 2022https://twitter.com/SierraSpaceCo/status/1598741068274700289I hope someone makes an article about this engine...