Description
A bigger version of the funkily-efficient D-Block upper stage, adding a cylindrical insert between the tapered-cone sections, an extra toroidal section around the engine, and eight small spherical auxiliary tanks in a ring ‘round the upper end of the stage.
A stock subassembly called D-Block Plus. Built with 25 of the finest parts, its root part is probeStackSmall.
Built in KSP version 1.10.1.