[Artem55]

High aspect ratio wings are no problem these days with CNC molded wings of carbon and kevlar. Still, I have seen more than one video of a ship simply exploding in mid-air from flutter. Extremely tight linkages with no slop are a must.

Do a little research on the subject. You will have to take up your argument with the PhD's in aerodynamics if you still have doubts. Here are a couple of links to get you started.

http://en.wikipedia.org/wiki/Dynamic_soaring

http://www.charlesriverrc.org/articles/flying/dynamicsoaring.htm

[Pecos]

Thanks for the references.