Blimey. I didn't think there were any twins purpose built for aeros (Cri-cri built primarily to be small?). Certainly wouldn't fancy pushing any sustained negative g in any of those aircraft, especially the Beech. But then, is there any point in building a thoroughbred twin aerobat? Perhaps not. I do know someone who stall turned an Aztec though.. Shall remain nameless. Apparently the standard spin recovery worked very well on the old truck.