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 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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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...
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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...
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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...
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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...
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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...
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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...
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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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Retrieved November 9, 2011. Bilstein & Lucas 1980, p. 192 "Rocket Motor, Solid Fuel, Ullage, Also Designated TX-280". Smithsonian. Archived from the original...
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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...
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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...
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transformer in the upper stage malfunctioned, which resulted in its ullage motors failing to ignite when the stage began its start-up sequence, sixty-six...
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number of mishaps: April 7, 1966: Centaur did not restart after coast — ullage motors ran out of fuel. May 9, 1971; Centaur guidance failed, destroying itself...
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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...
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(Sistema Obespecheniya Zapuska) ullage motor Proton Block DM fourth stage ? Energetic fragmentation event; caused by left over fuel in the ullage motor....
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from uncommanded cycles of acceleration. Liquid propellants often need ullage motors in zero-gravity or during staging to avoid sucking gas into engines...
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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...
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by an interstage structure containing four Siskin IB separation and ullage motors, which separated and ignited seven seconds after the first stage had...
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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...
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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...
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Liquefied petroleum gas (section Motor fuel)
oxygen concentration. A full LPG gas cylinder contains 86% liquid; the ullage volume will contain vapour at a pressure that varies with temperature. LPG...
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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...
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of the main engine. They also aided stage separation, and acted as ullage motors. Ducts built into the structure channelled vernier exhaust before stage...
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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...
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@SpaceTrackOrg" (Tweet). Retrieved 16 June 2016 – via Twitter. "Russian Ullage rocket engine explodes in space". Spaceflight Insider. 4 June 2016. Retrieved...
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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...
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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...
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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...
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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...
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