Astronuc said:One would have to look at the total process - to see if that is feasible.
It appears the idea is to oxidize the metal, which means change in volume and mass - with mass increasing. What is the specific energy of the system, as compared to alternatives?
Also, how is the thermal energy converted to mechanical energy for propulsion?
And where does one deposit the metal oxide?
And how much energy is consumed in reconverting oxide to metal?
Oxidation of Al is part of solid fuel rocket propulsion technology already - e.g. Shuttle SRBs.