Editing Soyuz (rocket family) (section)

=== Second stage ===
[[File:Korolyov cross.JPG|thumb|Here the four first-stage boosters fall away ([[Soyuz TMA-12]]), creating a cross smoke pattern in the sky, also known as a [[Korolev cross]].]]

The Soyuz booster's second stage, also called '''Blok-A''', is a single, generally cylindrical stage with one motor at the base, activated alongside the first-stage boosters. Like each first-stage booster, it also has four combustion chambers but with four (instead of two) vernier thruster combustion chambers for attitude control. The engine is pump-fed by a hydrogen peroxide gas generator. Propellant tanks are pressurized using liquid nitrogen vaporization. The second stage tapers toward the bottom, allowing the four first-stage rockets to fit more closely together.

Statistics:
* Height: {{convert|27.1|m|ftin|abbr=off}}
* Diameter: {{convert|2.95|m|ftin|abbr=off}}
* Empty mass: {{convert|6545|kg}}
* Gross mass: {{convert|99765|kg}}
* Propellant mass: {{convert|90100|kg}}
** Oxidizer load (liquid oxygen): {{convert|63800|kg}}
** Fuel load (RP-1): {{convert|26300|kg}}
* Powered by: 1 × [[RD-108A]] 
* Maximum thrust:
** At sea level: {{convert|792.5|kN}}
** In vacuum: {{convert|990.2|kN}}
* Specific impulse:
** At sea level: {{convert|255|isp}}
** In vacuum: {{convert|319|isp}}
* Burn time: 286 seconds
* Throttling: one-level
* Stage separation: Pyrotechnic fastener/[[hot staging]]