Orbital Propulsion Centre Introduces New 20N Monopropellant Hydrazine Thruster for Satellites

Orbital Propulsion Centre Introduces New 20N Monopropellant Hydrazine Thruster for Satellites

Orbital Propulsion Centre a division of the ArianeGroup renowned for spacecraft propulsion, quality, reliability, and performance has introduced a new 20N Monopropellant Hydrazine Thruster for satellites, spacecraft, and platforms

The 20N Monopropellant Hydrazine thruster has a thrust range of 7.9 to 24.6N (vacuum) and an ISP of 222 to 230 sec. It is equipped with a flow control valve, consisting of two identical monostable, normally-closed valves placed in series within a single housing. This double-stage flow control valve is used to control the propellant supply to the thruster. 

Each thruster is equipped with an internal redundant catalyst bed heater and with thermal insulation to guarantee optimum start-up. All materials used in the valve and thrust chamber assembly have been selected for compatibility with hydrazine propellant.

Principle of Operation

The flow of propellant to the decomposition chamber is controlled by the Flow Control Valve (FCV), which consists of two independent consecutive monostable, normally closed valve stages. When the valve is activated, the propellant is supplied through a fuel supply pipe, mounted inside the heat barrier, to the injection plate. The flow rate is adjusted by a constriction in this pipe to ensure that the delivered thrust is within the specified limits. The lower end of the pipe is welded to the injection plate, which provides the correct number and inclination of injection holes to ensure an adequate distribution of the propellant across the catalyst bed.

When the propellant comes in contact with the catalyst, the decomposition reaction is initiated. At low and preheated temperatures the decomposition of the hydrazine is solely due to the contact with the catalyst. At higher temperatures (typically above 600°C) a thermal equilibrium is reached across the complete catalyst bed and the hydrazine is solely decomposed due to temperature (thermal decomposition). Subsequent to the decomposition of the hydrazine the reaction gases are expanded through a conical nozzle with an area ratio of 60, thereby generating the desired thrust.

The thruster has performed successfully on several missions Integral, METOP 1-3, Herschel, and Planck missions

Click here to learn more about the 20N Monopropellant Hydrazine Thruster.

Click here to learn about Hydrazine Thrusters from various manufacturers listed on SATNow.

Publisher: SatNow

GNSS Constellations - A list of all GNSS satellites by constellations


Satellite NameOrbit Date
BeiDou-3 G4Geostationary Orbit (GEO)17 May, 2023
BeiDou-3 G2Geostationary Orbit (GEO)09 Mar, 2020
Compass-IGSO7Inclined Geosynchronous Orbit (IGSO)09 Feb, 2020
BeiDou-3 M19Medium Earth Orbit (MEO)16 Dec, 2019
BeiDou-3 M20Medium Earth Orbit (MEO)16 Dec, 2019
BeiDou-3 M21Medium Earth Orbit (MEO)23 Nov, 2019
BeiDou-3 M22Medium Earth Orbit (MEO)23 Nov, 2019
BeiDou-3 I3Inclined Geosynchronous Orbit (IGSO)04 Nov, 2019
BeiDou-3 M23Medium Earth Orbit (MEO)22 Sep, 2019
BeiDou-3 M24Medium Earth Orbit (MEO)22 Sep, 2019


Satellite NameOrbit Date
GSAT0223MEO - Near-Circular05 Dec, 2021
GSAT0224MEO - Near-Circular05 Dec, 2021
GSAT0219MEO - Near-Circular25 Jul, 2018
GSAT0220MEO - Near-Circular25 Jul, 2018
GSAT0221MEO - Near-Circular25 Jul, 2018
GSAT0222MEO - Near-Circular25 Jul, 2018
GSAT0215MEO - Near-Circular12 Dec, 2017
GSAT0216MEO - Near-Circular12 Dec, 2017
GSAT0217MEO - Near-Circular12 Dec, 2017
GSAT0218MEO - Near-Circular12 Dec, 2017


Satellite NameOrbit Date
Kosmos 2569--07 Aug, 2023
Kosmos 2564--28 Nov, 2022
Kosmos 2559--10 Oct, 2022
Kosmos 2557--07 Jul, 2022
Kosmos 2547--25 Oct, 2020
Kosmos 2545--16 Mar, 2020
Kosmos 2544--11 Dec, 2019
Kosmos 2534--27 May, 2019
Kosmos 2529--03 Nov, 2018
Kosmos 2527--16 Jun, 2018


Satellite NameOrbit Date
Navstar 82Medium Earth Orbit19 Jan, 2023
Navstar 81Medium Earth Orbit17 Jun, 2021
Navstar 78Medium Earth Orbit22 Aug, 2019
Navstar 77Medium Earth Orbit23 Dec, 2018
Navstar 76Medium Earth Orbit05 Feb, 2016
Navstar 75Medium Earth Orbit31 Oct, 2015
Navstar 74Medium Earth Orbit15 Jul, 2015
Navstar 73Medium Earth Orbit25 Mar, 2015
Navstar 72Medium Earth Orbit29 Oct, 2014
Navstar 71Medium Earth Orbit02 Aug, 2014


Satellite NameOrbit Date
NVS-01Geostationary Orbit (GEO)29 May, 2023
IRNSS-1IInclined Geosynchronous Orbit (IGSO)12 Apr, 2018
IRNSS-1HSub Geosynchronous Transfer Orbit (Sub-GTO)31 Aug, 2017
IRNSS-1GGeostationary Orbit (GEO)28 Apr, 2016
IRNSS-1FGeostationary Orbit (GEO)10 Mar, 2016
IRNSS-1EGeosynchronous Orbit (IGSO)20 Jan, 2016
IRNSS-1DInclined Geosynchronous Orbit (IGSO)28 Mar, 2015
IRNSS-1CGeostationary Orbit (GEO)16 Oct, 2014
IRNSS-1BInclined Geosynchronous Orbit (IGSO)04 Apr, 2014
IRNSS-1AInclined Geosynchronous Orbit (IGSO)01 Jul, 2013