Personally, I see nothing wrong with Lu, or anyone, speculating about any helicopter related subject, as long as the author makes it
absolutely clear to all, respectful of different cultural interpretations, that certian comments are purely speculative.
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To not lose the 'thread' of the thread, the moderator might;
1/ e-mail a copy of the offending post to the author, with a request that he/she edits it.
2/ then delete only the offending segment(s), awaiting the author's rephrasing of them.
Just my 2-bits worth.
(to non North Americans, 2-bits means a quarter, and a quarter means 25 cents, and 25 cents means nothing - if it's Canadian quarter) 