The pilot reported that on returning from a local flight he made an approach to land in light wind conditions. He was not satisfied with this or the subsequent approach, and go arounds were carried out. The third approach was normal, although the aircraft floated for some distance before touching down. The pilot was unable to bring the aircraft to a halt within the confines of the strip, and it came to rest in a gully. He then observed that the wind had changed from a headwind to a tailwind of about 10 knots, and this had evidently affected the landing performance of the aircraft.
