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Thiokol STAR series
Thiokol STAR motors cover a wide range of capabilities, from small 5" diameter
stage separation retro rockets to a 75" diameter demonstration engine designed
for perigee kick. Presented here is the STAR 48A, currently in use as a
Space Shuttle upper stage.
Engine statistics
| Specification |
STAR 48A |
| Propellants |
Ap / Al (???) |
| Max thrust |
21140 lb |
| Average thrust |
17,300 lb |
| Weight |
5674 lb |
| Burn time |
88 s |
| Effective specific impulse |
283.4 |
| Total impulse |
1,528,409 lbf-s |
| Expansion ratio |
27.3 |
| Mass fraction |
.94 |
| Chamber pressure |
542 psia |