Hi, I am working on investigating an idea I proposed regarding a ramjet that operates in subsonic flow (of a fixed speed) with a convergent intake. That utilizes the pressure immediately behind a standing shock-wave for compression. I have posted a link to my initial report here and I now need to undertake the detailed investigation. I am interested to see what opinion there is surrounding this idea and whether it holds any merit and if anyone has investigated convergent subsonic ramjets before? Thanks for all the advice.