Aluminum rocket propulsion
Duncan Law-Green reports on a project at the University of Hertfordshire that is developing a hybrid rocket motor that burns a mixture of CO2 and aluminum: CO2-aluminium hybrid rockets for Mars – Rocketeers.
Dick Stafford recalls the ALICE (Aluminum/Ice) propulsion research at Purdue: ALCOTOO propellant – The Original Rocket Dungeon
Here’s a video about the Hertfordshire work: