Originally posted by BMatthews
This really isn't a valid example. It's impossible for such a model to fly straight ahead with all it's wing on one side.
Actually it would still respond with a side slip as with the lift centered on the horizontal panel and the weight very close to the fuselage the fuselage would immediatley begin to drop bringing the rest of the wing with it which would give you a side slip condition in any event........ 
You are absolutly right ! But why the fuselage would fall down ( what you name sideslip) in the first place ? BECAUSE THERE IS NOT ENOUGH LIFT TO FLY STRAIGHT ! hence..... see above.....
Bernard