Head to head

Delta 2914 vs Kosmos 11K63

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 11K63: 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 11K63
Flights flown	30	126
Success rate	93.3%	93.7%
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 11K63

Flight record

93.7% success rate118 of 126 flown · 8 failed

1965peak 1970 · 20 flights1977

Maiden flight 1966-05-24. Retired.

Delta 2914 is built by McDonnell Douglas of the United States.Kosmos 11K63 is built by Strategic Rocket Forces of Russia.

Full specifications and the complete launch history for each: Delta 2914 · Kosmos 11K63.

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