Has anyone ever seen a photo of the GIRD-03 rocket engine, that M.K. Tikhnonravov designed? I believe only the fuel pump was built.
What was GIRD-04? I believe Yu.A. Pobedonostsev worked on project 04 and project 08. These were ramjets, but what exactly was 04 and 08?
My guess: 04 was hydrogen powered ramjet in supersonic wind tunnel. 08 was phosphorus powered ramjet shot from artillary canon. But I am not certain.