Due to its compact size and non-toxic propellant, ECAPS's 100mN HPGP Thruster is especially suited to small satellites and CubeSats. Key features of this system include:

  • Non-toxic propellant makes for easier and less costly integration on secondary or 'piggy-back' missions.
  • Allows for more secondary or 'piggy-back' launch opportunities, especially missions where there is concern about the hazards of hydrazine and its risks to the primary payload.
  • Allows for more capable missions than spacecraft without propulsion
  • Allows for more agile mission profiles than electric propulsion. Spacecraft take significantly less time to execute maneuvers and orbit changes.
  • Higher performance over hydrazine allows for more payload or longer mission duration.
  • 'Fuel at the factory' – integrate in place

Integrated small satellite modules using the 100mN HPGP are also offered in conjunction with VACCO as part of their MiPS (Micro Propulsion System) within their CubeSat Propulsion line of products. The VACCO MiPS integrates arrays of 100mN HPGP and cold gas thrusters working in symphony to provide highly capable and highly modular microsatellite propulsion systems.

VACCO MiPS and ECAPS 100mN HPGP are slated to be aboard two upcoming missions, ArgoMoon ( and Lunar Flashlight (, both intended to be sent around the Moon to conduct scientific exploration. In particular, Lunar Flashlight represents a demonstration of four 100mN HPGP thrusters (providing 3,320 N-sec total impulse) working in unison to map the Lunar surface.

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Last updated: 2024-02-05

100 mN HPGP Thruster




inlet pressure range
2.3 to 4.5 bar
thrust range
30 to 100 mN
Nozzle Expansion Ratio
Steady State Isp
1925 to 2050 Ns/kg
specific impulse
196 to 209 s
Density Impulse
2387 to 2542 Ns/L
minimum impulse bit
< 5 mN s
55 mm (Overall length ex. FCV)
0.040 kg (ex. FCV)
Nominal Reactor Pre-heating Voltage
Regulated Reactor Pre-heating Power
6.3 to 8 W
2000 (Target Life – Qual. Level)
6696 (Demonstrated Life)
Propellant Throughput
1 (Target Life – Qual. Level)
0.4 (Demonstrated Life)
Longest Continuous Firing
18 (Target Life – Qual. Level)
30 (Demonstrated Life)
Accumulated Firing Time
5 (Target Life – Qual. Level)
2.3 (Demonstrated Life)
Firing Sequences
150 (Target Life – Qual. Level)
128 (Demonstrated Life)


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