Motor 1 PLD Space.JPG
First TEPREL-DEMO motor created by PLD Space
Country of origin Spain
DesignerPLD Space
ManufacturerPLD Space
Liquid-fuel engine
Propellantliquid oxygen / kerosene
CyclePressure-fed engine (TEPREL-C will use a turbopump)
Thrust32.3 kN [1][2][3]
Burn time180 seconds[4]
Used in
Miura 1

TEPREL is a family of rocket engines designed and built by Spanish company PLD Space. It uses liquid propellant rocket engine technology to be used on their launchers Miura 1 and Miura 5. The TEPREL engine, called after the Spanish reusable engine program that is financing its development, uses kerosene and liquid oxygen as propellants.[5] So far, several versions of this engine, intended to propel Miura 1, have been developed and tested on the company's own liquid propulsion test facilities located in Teruel, Spain.[citation needed]


In the first versions of the engine the propellants are driven to the engine by using a pressure-fed cycle with Helium.[6] Later versions of the engine (TEPREL-C) incorporate a turbopump.[7]


The TEPREL-DEMO engine, originally called NetonVac1, was first tested in 2015. It is a calorimetric engine model, intended to demonstrate combustion stability as well as to acquire relevant information such as ignition and shut-down sequences, pressures and temperatures along the engine, thrust and propellant mass flow rates at different thrust profiles. Additionally, the engine served to test all associated hardware and software at PLD Space Propulsion Test Facilities. The engine is capable to produce a thrust of 28 kN at sea level.[2][1]


With the TEPREL-A engine, first tested in 2017, the company included several design upgrades, such as a new combustion chamber design[8], an improved injector geometry and a regenerative cooling system. The later enables the engine to fire for nearly 2 minutes, which is the envisaged nominal functioning duration for the suborbital launch vehicle Miura 1. At sea level, the engine produces a thrust of 32 kN.[1][2]


TEPREL-B is the first flight version of the TEPREL engine. Several design improvements have been implemented to reduce the overall weight of the engine. It is equipped with a thrust-vector-control system[9] and a convergent-divergent nozzle, all regeneratively cooled.[10] In May 2019 the first unit of this model was destroyed during a test. After a long investigation PLD Space concluded that the problem was due to excess pressure during engine start at ignition. PLD Space addressed the issue through a combination of improvements to the launch site infrastructure and procedural improvements.[11] It is currently fully operational. In February 2020, PLD Space successfully completed a 122 second test that allowed it to achieve flight rating.[12]

In August 28, 2020, PLD Space completed required tests for the thrust vector control system on the Teprel-B rocket engine.[13]


Flight version of the TEPREL engine[14] to be used in the Miura 5 rocket. It will be able to produce 81.6 kN of thrust at sea level.[15]

TEPREL-C vacuum

Version of TEPREL-C adapted to vacuum, and capable of re-ignition in microgravity conditions.[16] Capable of 65 kN of thrust.[15]


  1. ^ a b c Marín, Daniel (16 Feb 2018). "Europa apuesta por PLD Space para alcanzar el espacio". Retrieved 27 May 2018.
  2. ^ a b c "PLD Space ready to test its new engine". pldspace.com. 10 Jul 2017. Retrieved 27 May 2018.
  3. ^ https://twitter.com/RaulTorresPLD/status/1301132303297519616
  4. ^ https://www.youtube.com/watch?v=Xl80bggEOAM
  5. ^ "The Spanish Government supports PLD Space launchers development with a $1.56M TEPREL program". pldspace.com. 27 April 2016. Retrieved 27 May 2018.
  6. ^ https://pldspace.com/images/MIURA_1/MIURA1_Payload_Users_Guide.pdf
  7. ^ http://esamultimedia.esa.int/docs/space_transportation/LAUNCHER_WS_Presentation_PLDSpace.pdf
  8. ^ https://twitter.com/PLD_Space/status/882519746125680641
  9. ^ https://spacenews.com/pld-space-completes-critical-testing-of-its-teprel-b-rocket-engine/
  10. ^ https://twitter.com/RaulTorresPLD/status/1301132303297519616
  11. ^ https://spacenews.com/pld-space-books-first-suborbital-flight-nears-resolution-of-engine-setback/
  12. ^ https://www.defensa.com/aeronautica-y-espacio/exito-ensayo-motor-cohete-para-lanzador-reutilizable-pld-space
  13. ^ https://spacenews.com/pld-space-completes-critical-testing-of-its-teprel-b-rocket-engine/
  14. ^ https://danielmarin.naukas.com/2017/01/09/pld-space-mas-cerca-del-espacio/
  15. ^ a b http://esamultimedia.esa.int/docs/space_transportation/LAUNCHER_WS_Presentation_PLDSpace.pdf
  16. ^ https://twitter.com/RaulTorresPLD/status/1290394275230883840