The basic difference to Vostok was the elimination of the ejector seat to make room for two cosmonauts in spacesuits. To soften the landing, a solid fuel retro rocket was incorporated. Also a solid fuel back-up retro rocket system was carried in front of the spherical reentry capsule. The 3KD version carried an external inflatable airlock, allowing for spacewalk. After spacewalk, the airlock was jettisoned.
Kosmos 57 was an unmanned test flight of the Voskhod version with airlock. Although the craft entered orbit successfully and inflated the air lock, it was lost three hours after launch, when an unauthorised radio signal from a tracking station interfered with a legitimate transmission from the ground station causing the retro-engine to fire prematurely, which caused the satellite to spin and finally break up due to self destruction.
Voskhod 2 was a manned flight with a two men crew (Belyayev and Leonov). Leonov performed the first spacewalk ever, but had problems reentering the inflated airlock. After the airlock was jettisoned, a slow decrease of air pressure was noticed, leading to a earlier than planned return to earth. The capsule reentered safely after a 26 hour flight, but landed in the Ural mountains, nearly 1000 km north of the originally planned landing site. The crew was rescued about 1 day after landing.
The manned long duration flights with spacewalks, Voskhod 5 and 6, with respectively two female and two male cosmonauts were cancelled.
|Type / Application:||Manned spacecraft|
|Configuration:||Vostok / Zenit Bus|
|Propulsion:||TDU-1, back-up solid propellant retrorocket package|
|Lifetime:||1 day (#K57; #2)|
|Orbit:||165 km × 427 km, 64.74° (#K57); 167 km × 475 km, 64.79° (#2)|
|Kosmos 57 (Voskhod-3KD #1)||1965-012A||22.02.1965||Ba LC-31/6||Voskhod|
|Voskhod 2 (Voskhod-3KD #2)||1965-022A||18.03.1965||Ba LC-1/5||Voskhod|
|Voskhod 5 (Voskhod-3KD #3)||-||cancelled||Ba||Voskhod|
|Voskhod 6 (Voskhod-3KD #4)||-||cancelled||Ba||Voskhod|