Hi, the Hatz is a dynamite little bipe. I wrote a story about a Hatz based near Syracuse NY some years ago and it was a joy to fly. It felf much like a slightly lighter Charger. The Jabiru is a nice engine but I would go with a Rotax 912 if possible. The Rotax folks have been building this engine now for many years and there are thousands of them operating reliably. Norm