EntityQ7879124· pop 5· linked from 28 articlesUllage motorSign in to saveSmall rocket motor used to settle liquid fuel prior to ignition of a larger rocketConnectionsSaturn VEntityweightlessnessEntityInternational Standard Book NumberEntityrocketEntityApollo programConceptApollo 13ConceptJim LovellPersonspace debrisEntitylaunch vehicleEntityrocket engineEntitycryogenicsEntityProtonEntityApollo Lunar ModuleEntityPolar Satellite Launch VehicleEntitySaturn IBEntityliquid-propellant rocketEntitymultistage rocketEntityMolniyaEntitytrans-lunar injectionEntityRM-81 AgenaEntityCategoriesRocket engines