A.M. Isayev TDU-1
A.M. Isayev TDU-1 was the liquid-propellant retrorocket used for the Vostok spacecraft reentry burn. NASA records TDU-1 ground tests for the first piloted orbital spacecraft and identifies a TDU SP5-4 operations report for Object 3KA No. 3; this record is limited to the spacecraft retrorocket identity and does not represent the separate Vostok launch-vehicle Block E RD-0109 engine.
Identity
- Aliases
- TDU-1TDUTDU SP5-4
- Domains
- spaceflight
- Identity Level
- model
- Kind
- liquid-rocket-engine
- Name
- A.M. Isayev TDU-1
- Status
- historical
Details
- Description
- A.M. Isayev TDU-1 was the liquid-propellant retrorocket used for the Vostok spacecraft reentry burn. NASA records TDU-1 ground tests for the first piloted orbital spacecraft and identifies a TDU SP5-4 operations report for Object 3KA No. 3; this record is limited to the spacecraft retrorocket identity and does not represent the separate Vostok launch-vehicle Block E RD-0109 engine.
Links
Assets & Meta
- Creation Time
- August 25, 2026 at 06:47:15 UTC
- Updated Time
- August 25, 2026 at 06:47:15 UTC
Other
- Search Name
- A.M. Isayev TDU-1 TDU-1 TDU TDU SP5-4
- Sources
- Accessed Date
- 2026-08-25
- Note
- NASA records the TDU SP5-4 operations report for Object 3KA No. 3 and identifies Isayevs bureau as the developer of the Vostok reentry engine.
- Publisher
- NASA
- Title
- Rockets and People: Hot Days of the Cold War
- Accessed Date
- 2026-08-25
- Note
- NASA records ground tests of the TDU-1 engine and identifies it as the engine prepared for the first piloted orbital spacecraft.
- Publisher
- NASA
- Title
- SP-4408: Rockets and People, Part 1
- Accessed Date
- 2026-08-25
- Note
- The Vostok 1 account identifies the liquid-fueled retrorockets firing for about 42 seconds during reentry.
- Publisher
- NASA/ESA
- Title
- The Flight of Vostok 1
- Accessed Date
- 2026-08-25
- Note
- The museum identifies Isayevs retrofire TDU engine as powering Vostok in 1961.
- Publisher
- New Mexico Museum of Space History
- Title
- Alexei M. Isayev