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Pale Blue's Water Resistojet Thruster is a low pressure (< 60 kPa) propulsion system with a scalable water tank and a redundant flow control system with a fail-safe valve. The thruster unit is modular and it is possible to expand the overall system by clustering multiple units and scaling the propellant tank as needed. The limits of such clustering or scaling are determined by the mass, volume or power of a spacecraft.

The individual units provide a total impulse of > 270 N s and a specific impulse of 70 to 100 s, with a thrust of 2.0mN. The first model was demonstrated aboard a 3U ISS-deployed CubeSat in 2019 and two flight model thrusters are to be delivered in 2021 and launched by SLS and Falcon-9, respectively.

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Last updated: 2022-05-28

Water Resistojet Thruster



dry mass
0.8 kg (w/o tank)
propellant mass1
0.4 kg (1U)
thrust range
1.0 to 4.0 mN (2.0 mN nominal)
specific impulse
70 to 100 s
total impulse
> 270 N s
thrust to power ratio
0.2 mN/W
supply voltage
5 V
8 V
command interface
operating temperature
4 to 49 C
storage temperature
0 to 68 C

1. upon request


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