Sputnik 21 - Venera 2c

Spacecraft n°:

USSR spacecraft n°: 39

Launch data:

Spacecraft data:

Mission:

• The escape stage entered parking orbit but the main engine cut off just 0.8 s after ignition due to cavitation in the oxidiser pump and pump failure.
• At T+531 sec, the fourth vernier chamber of Stage 3's 8D715K engine exploded because the LOX cut-off valve had not closed as scheduled and LOX flowed into the hot chamber.