A propellant supply device (10) is provided for a vehicle (11)
having
a main propulsion motor (12) and having an attitude control system (11)
including a plurality of thrusters (14A, 14B, 14C, . . . ,
14F). The improved device comprises: a pressure vessel (15); first
and second movable walls (20, 21) operatively arranged within the pressure
vessel and dividing the interior space therewithin into three separate sealed chambers
(22, 23, 24) from each of which fluid may be supplied; a first fluid (e.g.,
a first bipropellant) in one of the chambers; a second fluid (e.g., a second bipropellant)
in a second of the chambers; and a third fluid (e.g., ammonia) in a third of the
chambers, the third fluid being a volatile liquid having a liquid phase and a gaseous
phase, and wherein all three chambers are pressurized to the vapor pressure of
the third fluid.