Ullage motors (also known as ullage engines or ullage rockets) are relatively small, independently fueled rocket engines that may be fired prior to main...

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...

Zapuska) ullage motor from a Proton Block DM fourth stage 2010-041H Energetic fragmentation event; caused by left over fuel in the ullage motor. 30th fragmentation...

some debris remained in orbit until 27 December, and the upper stage ullage motor platform remained in orbit until 19 January 1963. The designations Sputnik...

seconds after launch, when it fired its ullage motors in preparation for ignition. One of the ullage motors failed to fire, and when the main engine...

 Soviet Union Lander Launch failure Premature upper stage cutoff due to ullage motor malfunction; never left LEO Molniya Mariner 2 (P-38) 27 August 1962 NASA...

or "pointing the nose" of the craft; a backup means of deorbiting; ullage motors to prime the fuel system for a main engine burn. Because spacecraft...

small Auxiliary Propulsion System (APS) thruster modules were added as ullage motors for restarting the J-2 engine and to provide attitude control during...

Retrieved November 9, 2011. Bilstein & Lucas 1980, p. 192 "Rocket Motor, Solid Fuel, Ullage, Also Designated TX-280". Smithsonian. Archived from the original...

identifiable by its firing of three ullage motors; a later iteration of the S-IVB, the 500 series, had only two ullage motors, and was that used on Saturn V...

the manufacture of the Jet Assisted Take Off (JATO) rocket engines. Ullage motors were developed for the Saturn V Space Vehicle. The group also built...

As propellant is drained from its tank, something must fill the vacated ullage space to maintain pressure inside the tanks. This is for two reasons: first...

direct the S-IVB into a solar orbit, but an extra long burn of the ullage motors meant that venting the remaining propellant in the tank of the S-IVB...

escape. This is called "hot staging" and it eliminates the need for ullage motors on the second stage. A rushed development program led to dozens of failures...

GMT with a payload of 771 kg Surveyor mass model M-1. The Centaur's ullage motors failed again because they did not have enough propellant for the mission...

(Sistema Obespecheniya Zapuska) ullage motor Proton Block DM fourth stage ? Energetic fragmentation event; caused by left over fuel in the ullage motor....

from uncommanded cycles of acceleration. Liquid propellants often need ullage motors in zero-gravity or during staging to avoid sucking gas into engines...

number of mishaps: April 7, 1966: Centaur did not restart after coast — ullage motors ran out of fuel. August 10, 1968: AC-17. Centaur did not restart after...

by an interstage structure containing four Siskin IB separation and ullage motors, which separated and ignited seven seconds after the first stage had...

Earth's atmosphere. Upon separation using the on-board staging and ullage motors, the single J-2X engine would then have fired at full thrust to place...

of the main engine. They also aided stage separation, and acted as ullage motors. Ducts built into the structure channelled vernier exhaust before stage...

extra payload capacity to the booster. It also eliminates the need for ullage motors, as the acceleration from the nearly spent stage keeps the propellants...

oxygen concentration. A full LPG gas cylinder contains 86% liquid; the ullage volume will contain vapour at a pressure that varies with temperature. LPG...

@SpaceTrackOrg" (Tweet). Retrieved 16 June 2016 – via Twitter. "Russian Ullage rocket engine explodes in space". Spaceflight Insider. 4 June 2016. Retrieved...

Molniya-M (8K78M) LC-43/3, Plesetsk Failure Kosmos 1305 (Molniya 3-28L) One ullage motor exploded due to pre-flight damage, rupturing the Blok L RP-1 tank and...

lander 11 January Launch failure Maiden flight of Molynia-L, upper stage ullage motor failed to ignite, leaving spacecraft in useless orbit 7 January 21:09:49...

Earth (achieved) Spacecraft test Premature separation of fourth stage ullage motors 27 September 1967 22:11 Proton-K/D 8K82K/11S824 229-01 Site 81/23 Failure...

open during flight when the ullage (empty space) pressure of the liquid hydrogen tank reaches 38 psi (260 kPa) or the ullage pressure of the liquid oxygen...

control system failure that resulted in the premature jettisoning of the ullage motors, the main propulsion system of the Block-D did not ignite. Kosmos 154...

Earth Venus lander 28 August Launch failure One of four upper stage ullage motors failed to ignite, resulting in loss of control 27 August 06:59:14 Atlas...