In article ,
(Canuck Bob) wrote:

I am working slowly on an evolving Fly5k design and considering a
swept forwrd wing. Does anyone know anything about thier design?
Also would anyone have experience with the Sisler Cygnet, Andreasson
BA-7, or Pottier's Bleu Citron designs. The Cygnet seems to be well
thought of but I don't know any owners or pilots that actually flew
one.

I've learned that mild forward sweep (less than 5 degrees)is not much
different than a standard wing. A tapered wing with lots of forward
sweep is prone to twist its tips upward under load so must be
torsionally rigid. I am sticking with the simple rectangular wing
planform and sweep of 3-4 degrees max.

This allows a compact mid wing and with a 30% C spar location the
pilot sits on the c of g with the mac moved forward slightly (app. 1/2
the amount of forward sweep).

A number of two place gliders use forward sweep for exactly the reason
you are citing. A common forward sweep wing glider is the Blanik L-13,
L-23 series (as used by the USAF Academy, the Civil Air Patrol, and
about a zillion glider operations all over the world) See
http://www.nwinternet.com/~blanikam/ba/prod01.htm.

The Alexander Schleicher Ka-7 and Ka-13 gliders are also very common
forward swept wing gliders. http://www.gliding-in-melbourne.org/ka7.htm
has a good three view.

Good luck with the design.

Wallace