I built the Kyosho Cub about three years ago and it sat on the shelf in basement . Power is an OS 46. Yesterday I tried to fly it off some fairly tall grass in no wind conditions. I horsed it off the ground several times with a too low flying speed. It dropped back to the ground each itme and cart wheeled, etc. Finally I let it fly off and got it up about 30 feet and it apparently stalled and went in nose down. Everyone watching was amazed. Just nosed over from a wings level, nose level attitude. I'm not an expert pilot, but have had a half dozen various kits and ARFs that have flown OK. This seems unusual. Anybody else have similar problems with this plane?