On 17 Nov 2003 10:50:07 -0800, (Jay) wrote:

But why not take each of those sailplane wings and put one
over the top of the other? You mentioned the interference drag, so
how far do wings need to be vertically separated for a given airfoil
and stagger for this effect to be negligable?



jay
I seem to recall something that tried this.
the dynamics of the thing bought it undone.
as the forward wind flexes it alters the flow over the rear wing and
induces flexing. the thing can self destruct if you get the thing
wrong.

Stealth (everything is aeroelastic to some degree) Pilot