Head to head

Soyuz 2.1b/Fregat vs Zenit-2

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

Soyuz 2.1b/Fregat: 8,200 kg

Zenit-2: 13,740 kg

Side by side

9 comparable figures

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

Metric	Soyuz 2.1b/Fregat	Zenit-2
Flights flown	26	35
Success rate	92.3%	82.9%
Payload to LEO (kg)	8,200	13,740
Payload to SSO (kg)	4,900	5,000
Liftoff thrust (kN)	4,150	7,300
Length (m)	46.3	57
Diameter (m)	2.95	3.9
Launch mass (t)	312	459
Stages	4	2

Soyuz 2.1b/Fregat

Flight record

92.3% success rate24 of 26 flown · 2 failed

2006peak 2011 · 4 flights2026

Maiden flight 2006-12-27. Still flying.

Zenit-2

Flight record

82.9% success rate29 of 35 flown · 6 failed

1985peak 1987 · 5 flights2004

Maiden flight 1985-04-13. Retired.

Soyuz 2.1b/Fregat is built by Progress Rocket Space Center of Russia.Zenit-2 is built by Yuzhnoye Design Bureau of Ukraine.

Full specifications and the complete launch history for each: Soyuz 2.1b/Fregat · Zenit-2.

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