Encyclopedia entry Star 48A l Engine · USA Part of Star 48 Original archive entry. The text, images and links below are kept as they were written. Star-48A LongCredit: Thiokol Thiokol solid rocket engine. In Production. Total impulse 709,062 kgf-sec. Motor propellant mass fraction 0.941. RelatedCountryUSAPropellantsSolidAgencyThiokolBibliography410