Well, of course, we still have no hard information about it, maybe because plans, drawings and
other data were lost, or maybe because there never was much about this aircraft at all, as often
for concepts. A "mystery" probably is something else, or we had to call most projects, we don't know
completely a "mystery".
About the relation of Grokhovski to that ram fighter, I would be very cautious. He actually was an
aircraft engineer/designer and in this design, I cannot see too much influence of aviational technology
of the late thirties. The idea looks great at first glance, to ram an enemy aircraft with the hardened
nose, but don't forget, that it's still shown as prop aircraft ! And perhaps we should think a moment
about the acceleration, the pilot would have to stand, even if this thing would slice thraough a bomber
"as a hot knife through butter". Ram tactics were developed and (rarely) used at the end of WW II in
Germany and, I think, in Japan, and AFAIK, they were always regarded as VERY hazardous, to say the
least ! The author of that "invention" tries to sell this ram fighter as a kind of ultimate wonder weapon
against the bomber, during a time, when the bomber still hadn't shown his full destructive power.
Nowadays, we probably would call such a drawing "fanart" .