BarryB, a properly set-up 3-D airframe will NOT snap without rudder input. A waterfall is a series of stalls from upright to inverted in such a way the plane rotates around its CG, and thats violent. Don't make the assumption a violent stall requires speed. With a blender once the stall is established its maintained through the maneuver, it doesn't instantly go from positive to negative. And if you think entrance to a wall is a gentile stall, its hard to think of a more violent stress induced maneuver.
Dick, I would love to see it fly, you might even make a beliver out of me.
Tailtwister, you explained the tumbling better than I did
P.S. I agree Esprit models are too expensive for what they are.