I tested the flaperons some more this weekend. I found that although the stall speed is lower with some flap deployed, the tip stall, and resulting spin was in fact more violent, which was to be expected with the washin condition created by the barn door style flaperons. The greatest concern is spin recovery, and the amount of time that you have to recover before the stall develops into a full spin.

Given that the main purpose of this discussion is to lower the landing speed of the cessna, I wouldnt suggest using the flaperon during a landing. In fact I have only tested them at altitude, and have not used them myself close to the ground.

I think that I am going to build some real flaps into my wing, possibly using a thin piece of sheeting, hinged on the underside of the wing. Then I will not have to disturb the covering on the wing.