> I think Raptor might be the first Methane-based rocket engine as well. If I remember correctly, John Carmack's Armadillo Aerospace tried burning methane in a

> I think Raptor might be the first Methane-based rocket engine as well. If I remember correctly, John Carmack's Armadillo Aerospace tried burning methane in an engine. Though I don't think they were the only team - or even the first one.