The Titan IIIE/Centaur will provide
a high-energy capability for plane-
tary missions. The Helios solar probe
and Viking Mars lander missions,
scheduled for the 1974-1975 time
period will be the first missions to
fly on this vehicle. The Titan IIIE
is basically a Titan IIID modified
to accept the Centaur upper stage.
The Titan IIIE consists of the two-
stage Titan core with two 3.05 meter
(120-inch) diameter, 5-segment solid
propellant motors added as a "O stage".
OXIDIZER TANK The Centaur is a high-performance stage
using liquid hydrogen and liquid oxygen
propellants. The Centaur is restartable
and it has an inertial guidance system
that provides guidance for itself and
the Titan IIIE.