Head to head

Delta 2914 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

Delta 2914: 724 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	Delta 2914	Kosmos-2I 63S1
Flights flown	30	38
Success rate	93.3%	68.4%
Payload to LEO (kg)	724	300
Length (m)	35	31
Diameter (m)	2.44	1.6
Launch mass (t)	130	48
Stages	4	2

Delta 2914

Flight record

93.3% success rate28 of 30 flown · 2 failed

1974peak 1977 · 8 flights1979

Maiden flight 1974-04-13. 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.

Delta 2914 is built by McDonnell Douglas of the United States.Kosmos-2I 63S1 is built by Strategic Rocket Forces of Russia.

Full specifications and the complete launch history for each: Delta 2914 · 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.