Dick,
Spoilers on gliders kill lift and add drag, so it does really not lower the
stall speed.

A modified leading edge will, it can be made with a ad-on like it is made on
Cessnas and others.

One simple way to gain some is to seal the hinge line and the junktion
between wing and fuselage.

VG's = vortex generators is another way to go.

Jan Carlsson
www.jcpropellerdesign.com


Just for discussion, what opinions are there for an individual lowering
the
stall speed of an existing wing considering constructability and cost?

I remember there was some leading edge profile modification studies done
years ago but can't see that as a practical approach for an individual.

Thinking about how to add sailplane-type upper surface spoilers, WW2
fighters underwing dive brakes, etc.

Dick