If you change a design to different wing sweep, don't forget
that it will move the center of lift in the direction of
sweep and it may significantly alter W & B and permissible CG
range position.

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Paul Lee, SQ2000 canard project: www.abri.com/sq2000

(Canuck Bob) wrote in message . com...
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).