My plane also went into a dive after I try to do a nose over. Everything happened so fast and I was disoriented due to the sun so I am not sure if the plane could not pull out of the dive or I just lost control. Anyway, the new one is on the way, It should be here Friday. But I am curious about the dive problems with the plane. Also, it looks like the Saito 120 is a goner. crank is bent. I guess the ST 90 will go in the new plane which should be plenty of power. I really did like the feel of the 4 strokes..