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Water-based SmallSat Propulsion

Efficient. Affordable. Easy to use.

Comet CubeSat and Microsatellite Propulsion System 

A simple, launch-safe, and cost-effective electrothermal propulsion system that uses water as a propellant and offers the ideal balance of cost and performance.


Great Performance

Comet boasts 80% of the specific impulse of dangerous mono-propellant systems, but at only 20% of their typical price. It also offers more thrust with less electrical power than electric propulsion systems, allowing shorter maneuver times. This means your spacecraft can expend its valuable resources on operating the payload rather than the propulsion system.

Robust Operations

Using water as a propellant makes Comet easy to work with. The system is already approved to fly on multiple launch vehicles as part of a secondary or rideshare spacecraft. It was designed for ease of operations, meaning Comet will be easy to use, from the lab to orbit.

Easy Integration

Comet is easy to adapt and integrate to your spacecraft. The tank design is scalable from CubeSats to small micro-satellites, and the electronics have a flexible interface suitable for a wide range of spacecraft.

Comet Advantages

  • Non-toxic; safe for humans and for launch vehicles
  • Approved for flight on multiple launch vehicles
  • 80% of monopropellant Isp, 20% of the cost
  • More thrust with less electrical power than electric thrusters
  • Highly-flexible interface suitable for a wide range of spacecraft sizes

Price and Availability

The single unit price is $200,000, with volume discounts available.
Typical schedule is three months from order to delivery.