Full Breakdown
MIT Demonstrates Dual-Mode Propulsion for Cubesats Using a Single Green Fuel
6/11/2026, 11:21:18 AM
Dual-Mode Propulsion Demo on GPDM Cubesat
NASA’s Green Propulsion Dual Mode (GPDM) cubesat will launch no earlier than November 2024 to test a propulsion system that powers one chemical thruster and four electrospray thrusters from an ASCENT tank. Success would mark the first in-orbit use of shared-tank dual-mode propulsion on a cubesat.
Background, Key Players, and Timeline
ASCENT, a hydrazine substitute developed by Air Force, flew as AF-M315E on 2019-20 Green Propellant Infusion Mission, powering chemical thrusters. MIT’s Space Propulsion Laboratory, led by Amelia Bruno and Paulo Lozano, showed ASCENT works with electrospray thrusters. Tests released June 1 2024; Rubicon provides chemical thruster and MIT’s electrospray units will integrate in fall 2024 for November GPDM launch.
Data and Mission Impact
GPDM will carry ?1 kg of ASCENT, feeding a chemical thruster for rapid burns and four electrospray thrusters for low-thrust adjustments. Ground tests with ~1 g of propellant showed electrospray thrust comparable to propellants and continuous operation without degradation. Sharing a tank lets cubesats allocate propellant for fast insertions or station-keeping, expanding missions from Earth observation to deep-space trajectory corrections.
Official Statements & Responses
NASA calls the GPDM flight a valuable demo for missions beyond low Earth orbit. MIT says the tests show parity with electrospray propellants and that the dual-mode system offers the best of both worlds for small spacecraft. Rubicon confirms delivery of the chemical thruster.
Criticism & Opposition
No dissenting viewpoints or technical criticisms were reported in the available sources.
On-the-Ground Test Results
The model cubesat was levitated in a vacuum chamber. Varying thruster voltages made it spin like a slow-motion top, and the electrospray thrusters operated continuously without measurable degradation.
Conflicting Reports & Gaps
All sources agree on launch schedule and ground-test results; no contradictions appear. Long-term reliability of a shared-tank system in orbit remains untested.
Verbatim Quotes
- “If you can have chemical and electrical propulsion in one small package, it's the best of both worlds,” — Amelia Bruno, former postdoctoral researcher, MIT Space Propulsion Laboratory
- “This opens the door for small satellites to do even more science, more observations, and more interesting missions, all on a smaller and cheaper platform.” — Amelia Bruno
- “Say there's a storm coming, and you'd want to deploy your constellation of small satellites to observe over one location,” — Paulo Lozano, director, MIT Space Propulsion Laboratory
- “NASA is looking to expand deeper into space to support future agency objectives. Major drivers for these activities include researching and developing new and advanced propulsion systems and capabilities,” — NASA agency officials
What's Next
After GPDM reaches orbit, NASA will evaluate thrust performance, propellant consumption, and tank management. Results will inform decisions on adopting ASCENT dual-mode propulsion for future cubesats and larger deep-space vehicles.
