Engines: eight SuperDraco engines mounted sideways, grouped in four groups of two. Each engine is capable of
producing 71 kN thrust. Each engine group, called a quad by SpaceX, contains two SuperDraco engines
and four Draco engines for attitude control. Normally the fuel of two quads is used for maneuvering in
orbit, while the other two are used for re-entry. SuperDraco engines are the first fully 3D printed: the
combustion chamber is printed in Inconel, an alloy of nickel and iron.