Colorado-based Ursa Major is developing its reusable Arroway 200,000-pound thrust liquid oxygen and methane staged combustion engine for military and commercial use. The development comes as the Department of the Air Force weans itself off of Russian RD-180 and RD-181 engines. In March, Dmitry Rogozin, head of the Russian state space agency Roscosmos, said that Russia would stop selling the engines to the United States because of U.S. sanctions against Russia for the latter's assault on Ukraine. Arroway is to…
