DC10 accident in houston, turbine that was placed on tail will stress the material there, the concept of "biplane is feasible", the unique concept that can be feasible, the other 2 were already experimented. I am not an expert neither a geek, but B2 is expensive because is "uncontrollable", the second draw is the "twin" torpedoes, this is older than grandma, good to kill pilots, the third has something that all kitchen needs, "hells kitchen", exaust fan, yes i am tired, sick persons really made a normal person got tired, it is shit all day, doing at "oposite way".
