|Mission name||Soyuz 1|
|Spacecraft type||Soyuz 7K-OK|
|Spacecraft mass||6,450 kg (14,200 lb)|
|Call sign||Рубин (Rubin - "Ruby")|
|Launch pad||Gagarin's Start, Baikonur Cosmodrome|
|Launch date||April 23, 1967 00:35:00UTC|
|Landing||April 24, 1967 03:22:52UTC|
|Number of orbits||18|
|Apogee||223 km (139 mi)|
|Perigee||197 km (122 mi)|
|Orbital altitude||88.7 minutes|
Soyuz 1 (Russian: Союз 1, Union 1) was a manned spaceflight of the Soviet space program. Launched into orbit on April 23, 1967 carrying cosmonaut Colonel Vladimir Komarov, Soyuz 1 was the first flight of the Soyuz spacecraft. The mission plan was complex, involving a rendezvous with Soyuz 2, swapping crew members before returning to Earth.
Backup crew 
Mission parameters 
- Mass: 6,450 kg (14,200 lb)
- Perigee: 197 km (122 mi)
- Apogee: 223 km (139 mi)
- Inclination: 50.8°
- Period: 88.7 minutes
Soyuz 1 was the first manned flight of the first-generation Soyuz 7K-OK spacecraft and Soyuz rocket, designed as part of the Soviet lunar program. It was the first Soviet manned spaceflight in over two years, and the first Soviet manned flight following the death of the Chief Designer of the space program Sergey Korolyov. Komarov was launched on Soyuz 1 despite failures of the previous unmanned tests of the 7K-OK, Cosmos 133 and Cosmos 140. A third attempted test flight was a launch failure; a launch abort triggered a malfunction of the launch escape system, causing the rocket to explode on the pad. The escape system successfully pulled the spacecraft to safety.
Prior to launch, Soyuz 1 engineers are said to have reported 203 design faults to party leaders, but their concerns "were overruled by political pressures for a series of space feats to mark the anniversary of Lenin's birthday." It is not clear how much of this pressure resulted from the need to continue beating the United States in the Space Race and have Soviets first on the Moon, or to take advantage of the recent setbacks in the U.S. space program with the Apollo 1 disaster.
Yuri Gagarin was the backup pilot for Soyuz 1, and was aware of the design problems and the pressures from the Politburo to proceed with the flight. He attempted to "bump" Komarov from the mission, knowing that the Soviet leadership would not risk a national hero on the flight.
Mission planners intended to launch a second Soyuz flight the next day carrying cosmonauts Valery Bykovsky, Yevgeny Khrunov, and Aleksei Yeliseyev, with Khrunov and Yeliseyev scheduled to do an EVA over to Soyuz 1.
Mission details 
Soyuz 1 was launched on April 23, 1967 at 00:32 UTC from Baikonur Cosmodrome, making Komarov the first Soviet cosmonaut to fly in space twice.
Problems began shortly after launch when one solar panel failed to unfold, leading to a shortage of power for the spacecraft's systems. Further problems with the orientation detectors complicated maneuvering the craft. By orbit 13, the automatic stabilization system was completely dead, and the manual system was only partially effective.
The crew of Soyuz 2 modified their mission goals, preparing themselves for a launch that would include fixing the solar panel of Soyuz 1. However, that night, thunderstorms at Baikonur Cosmodrome affected the booster's electrical system, causing the mission to be called off.
As a result of Komarov's report during the 13th orbit, the flight control director decided to abort the mission. After 18 orbits, Soyuz 1 fired retrorockets and reentered the Earth's atmosphere. Despite the technical difficulties up to that point, Komarov might still have landed safely. To slow the descent, first the drogue parachute was deployed, followed by the main parachute. However, due to a defect the main parachute did not unfold: when preparing the ship, the heat shield was made thicker and therefore heavier, and the main parachute similarly larger. The container where it was kept was not enlarged, and the main parachute had to be hammered inside with wooden hammers.
Komarov then activated the manually deployed reserve chute, but it became tangled with the drogue chute, which did not release as intended. As a result, the Soyuz reentry module fell to Earth in Orenburg Oblast almost entirely unimpeded, at about 40 m/s (140 km/h; 89 mph); Komarov died on impact. At impact there was an explosion and an intense fire that engulfed the capsule. Local farmers rushed to try to put it out.
Eight years after Komarov's death, a story began circulating that Komarov cursed the engineers and flight staff, and spoke to his wife as he descended, and these transmissions were received by a NSA listening station near Istanbul. Some historians regard this to be untrue, although recordings of the incident reportedly exist.
The Soyuz 1 tragedy delayed the launch of Soyuz 2 and Soyuz 3 until October 25, 1968. This eighteen-month gap, with the addition of the explosion of an unmanned N-1 rocket on July 3, 1969, scuttled Soviet plans of landing a cosmonaut on the Moon. The original mission of Soyuz 1 and Soyuz 2 was ultimately completed by Soyuz 4 and Soyuz 5.
A much improved Soyuz program emerged from this eighteen month delay, mirroring the improvements made in Project Apollo after the Apollo 1 tragedy. Although it failed to reach the Moon, the Soyuz went on to be repurposed from the centerpiece of the Zond lunar program to the people-carrier of the Salyut space station program, the Mir space station, and the International Space Station. Although it suffered another tragedy with the Soyuz 11 accident in 1971, and went through several incidents with non-fatal launch aborts and landing mishaps, it has become one of the longest-lived and most dependable manned spacecraft yet designed.
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