Didn't I already note that in a past thread?
I haven't come across a great deal of creative thinking on this thread. Two serious-money attempts at this have been made, without success, using fairly common approaches. Since then somewhat more rigid materials have become more commonly available. (How does the specific modulus of commercially fabricable carbon-carbon compare to aluminum or steel? The last two are equal.)
I offered a very feasible helicopter that no one seems to given noticed. Why is that? Itís difficult to expect much from one's fellow posters, without some prodding, after such a blank reception.
Do you have anything yourself?