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Ullage or
headspace is the
unfilled space in a container,
particularly with a liquid. The word
ullage comes from the
Latin word oculus, used by the Romans...
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Ullage motors (also
known as
ullage engines or
ullage rockets) are
relatively small,
independently fueled rocket engines that may be
fired prior to main...
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Ullage (from the
French ouillage) is a
winemaking term that has
several meanings but most
commonly refers to the
headspace of air
between wine and the...
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small Auxiliary Propulsion System (APS)
thruster modules were
added as
ullage motors for
restarting the J-2
engine and to
provide attitude control during...
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infeasible at the time. The
upper stages also used
small solid-propellant
ullage motors that
helped to
separate the
stages during the launch, and to ensure...
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control authority is
provided by cold gas
thrusters fed with
residual ullage gas. Four
perpendicular vents are
located within the interstage, placed...
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fully filled, and
during use,
there is a
space above the fuel,
called the
ullage, that
contains evaporated fuel
mixed with air,
which contains the oxygen...
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control authority is
provided by cold gas
thrusters fed with
residual ullage gas. Four
perpendicular vents are
located within the interstage, placed...
-
oxygen concentration. A full LPG gas
cylinder contains 86% liquid; the
ullage volume will
contain vapour at a
pressure that
varies with temperature. LPG...
- fire-****ant.
Another minor use is in rocketry,
where helium is used as an
ullage medium to
backfill rocket propellant tanks in
flight and to
condense hydrogen...
