NASA has set an ambitious three-year goal for developing green fuel for spacecraft, and it looks like the mission is right on target. Called Green Propellant Infusion Mission (GPIM), the $45 million program is spearheaded by Ball Aerospace in partnership with the company Aerojet Rocketdyne and other public sector partners, with the aim of creating a high-powered substitute for hydrazine, a ubiquitous but highly toxic and corrosive fuel for rockets, satellites and spacecraft. So far so good: not only did the new fuel pass its first major milestone, it packed more punch than conventional hydrazine.
NASA’s Green Fuel For Spacecraft
NASA also has another green fuel project going on called Morpheus, but before we get into that let’s see how GPIM is doing.
The AF-M315E which was used to power a 22 newton thruster, a newton being an international unit of force (btw we’re going with the standard lower case for the first letter when newton is spelled out in English, and upper case for the abbreviation. If you have a different standard let us know in the comments).
Passing the 22 newton thruster test was critical because that thruster needs to be synchronized with four 1N thrusters for orbit, altitude and de-orbit maneuvers.
Ball and its partners also get an extra pat on the back for achieving an improved performance, which Ball describes as “nearly 50 percent better” compared to conventional hydrazine. That translates into increased payloads and longer missions, on top of reducing launch hazards and other operational issues involved with hydrazine.
According to NASA, AF-M315E is more dense than hydrazine, which means that it requires less storage space for the same volume of fuel. It also has a lower freezing point, so storage temperature control doesn’t need to divert as much power.
We Built This Green Fuel!
Aside from Aerojet Rocketdyne, the other GPIM partners include NASA Glenn Research Center, NASA Kennedy Space Center, the U.S. Air Force Research Laboratory at Edwards Air Force Base, and the U.S. Air Force Space and Missile Systems Center at Kirkland Air Force Base.
The deployment of public sector resources to develop them new fuel is critical because, as with so many other cutting edge technologies, the risk factor involved in the early stages of development is too great to attract sufficient private sector dollars. Or, as NASA puts it:
“Maturing a space technology, such as a revolutionary green propellant, to mission readiness through relevant environment testing and demonstration is a significant challenge from a cost, schedule and risk perspective. NASA’s Technology Demonstration Missions Program performs this function, bridging the gap between laboratory confirmation of a technology and its initial use on an operational mission.”
Now let’s check in on another NASA/private sector green propulsion system under the moniker of Project Morpheus. This one is based on a mixture of liquid oxygen and methane, the attraction being that methane could be harvested from other operations in space, such as the biogas generated by human waste (apparently the International Space Station already produces enough biogas to get the job done).
A hardware problem interfered with a test of the new propellant last summer, leading to a dramatic crash-and-burn event, but since then Project Morpheus has been moving forward at a steady clip.
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