Lockheed ILRV Orbiter Optimized for Bell-type Engine (Resulting Compromise Design) Propellant Crossfeed Scheme 19700022514 Image credit: LockheedFile source: NASA NTRS Share this: Share on X (Opens in new window) X Share on Tumblr (Opens in new window) Tumblr Share on Pinterest (Opens in new window) Pinterest Share on Pocket (Opens in new window) Pocket Email a link to a friend (Opens in new window) Email Like Loading...