The 431 is a variant of the Atlas V, using the long size 4m
diameter payload shroud, with three solid boosters and a single RL-10 engine on
the Centaur second stage.
Decals are provided for the Inmarsat 4F1, Intelsat 14, and
Echostar 19 missions.
Made from 8 cast polyurethane resin parts and five 3D printed parts