Rotaryphile,

I would like to add one or two thoughts. You stated you wanted a slow flying craft. The lighter the wing loading, then the less power and air speed that is needed to generate the needed lifting forces. I cut lightening holes in everything and I mean EVERYTHING.

If you want a good stable craft, build washout into the tips, raise the tip about 1/4!QUOT! or so on a 15!QUOT! chord beginning the bending of the wing at about a point 25 - 33% inward of the tip toward the root. The purpose here is to stall the root of the wing before the tip.

One last thought, set the top wing incidence at 1% greater angle than the lower wing. You can go even further if you like. The purpose is for the top wing to stall first, thus dropping the nose and regaining the needed air speed to maintain flight. This incidence differential is what makes biplanes such forgiving craft.

The above does not apply to aerobatic craft where the incidence is 0. However, I watched a home builder of a full scale aerobatic bipe, use a less efficient airfoil on the top wing to achieve the same forgiving characteristics.

Best regards,
THC