Head to head

Atlas SLV-3D Centaur vs Kosmos-2I 63S1

Two vehicles in the same payload class. Every figure below comes from the same two sources for both rockets, and a row appears only when both publish the input.

Payload to low Earth orbit

Relative

Atlas SLV-3D Centaur: 800 kg

Kosmos-2I 63S1: 300 kg

Side by side

7 comparable figures

The highlighted value wins the row. Rows where neither direction is better, like length or stage count, highlight nothing.

Metric	Atlas SLV-3D Centaur	Kosmos-2I 63S1
Flights flown	32	38
Success rate	93.8%	68.4%
Payload to LEO (kg)	800	300
Length (m)	21	31
Diameter (m)	3.05	1.6
Launch mass (t)	120	48
Stages	2	2

Atlas SLV-3D Centaur

Flight record

93.8% success rate30 of 32 flown · 2 failed

1973peak 1978 · 7 flights1983

Maiden flight 1973-04-06. Retired.

Kosmos-2I 63S1

Flight record

68.4% success rate26 of 38 flown · 12 failed

1961peak 1962 · 8 flights1967

Maiden flight 1961-10-27. Retired.

Atlas SLV-3D Centaur is built by Convair of the United States (company profile on Space Index).Kosmos-2I 63S1 is built by Strategic Rocket Forces of Russia.

Full specifications and the complete launch history for each: Atlas SLV-3D Centaur · Kosmos-2I 63S1.

Specifications from Launch Library 2 by The Space Devs, launch records from Space Index. Derived figures are computed here; see sources and method.