James summarized pretty well what makes this plane so unique. I'd add that it's really fat and it's nose is round in shape, not pointed, resembling more a transport glider or a heli, and speaking for low-speed operation together with the wings, which, in turn, are too small for a glider, but too big for a high-speed plane. I see no sign of any air intake, so it has either rocket propulsion (I don't think so), or none, or something highly unconventional. Electric maybe? My first thought was that it was a large drone or a flying bomb, but it seems more civilian than military despite the shark teeth. Moreover, it doesn't seem as old as the b/w photo suggests, anyway, congrats to LameHawk, it's really nasty and teaches us not to be over-confident in our knowledge.