If one wanted to learn how it would not be unreasonable....most of us are doing other things though.....We haven't lost anything except a bad attitude. Anybody who knows how to design an airplane will already have worked through the things he went over. Did he really expect people here to double check all his work?
He came here, started a thread, and announced that people were not allowed to participate in his thread unless they met his criteria and did it his way. Then he posted some calculations, with a “gotcha” to see who would find it and comment on it. Then he got, per his profile posts, “drstress Bored with amateurs”. Then he left, or, more likely, is lurking to see the comments here.Unfortunate. I think lots of people (incl the OP and many folks here) could have learned quite a bit from a productive exchange of ideas. Personalities and ways of conveying information (mine included), together with the challenges of this particular medium sometimes prove too much and trump even the self-interests of those involved.