Compare rockets
Pick up to 4 vehicles to compare specs and flight records side by side. Browse all →
| Specification | Firefly Alpha Firefly Aerospace × remove | Soyuz U Russian Federal Space Agency (ROSCOSMOS) × remove | Kosmos 11K63 Strategic Rocket Forces × remove |
|---|---|---|---|
| Flights | 7 | 714 | 126 |
| Success rate | 57.1% | 97.2% | 93.7% |
| Thrust | 736 kN | — | — |
| Height | 29.6 m | 51.1 m | 31 m |
| Diameter | 1.82 m | 2.95 m | 1.6 m |
| Launch mass | 54 t | 313 t | 48 t |
| LEO capacity | 1,000 kg | 6,900 kg | 300 kg |
| GTO capacity | — | — | — |
| Launch cost | $15M | — | — |
| Reusable | No | No | No |
| Stages | 2 | 3 | 2 |