Hello, haven't been active for a while. I'm interested in technical details of the J. guided missiles projects during WW2. I know about the Funryu project from this site ( Funryu (Raging Dragon) SAM ), but I find the info there a bit confusing. As I understand the version 4 had dual radio and radar guiding, but what about the others? How big should be the warhead to house the guidance systems with the technology of the time? If you have some info you are welcome to contribute.