As the pilot started turning final on runway 25, he noted a little drift to the right, but he said he straightened out easily and flew straight on touchdown. The aircraft was still flying straight as it was slowing down, when a gust of wind weathercocked the airplane toward the left. The airplane left the runway heading towards a hay field, but before reaching the field, the right landing gear hit a concrete drain inspection pipe, separating the landing gear. The right wing tip struck the ground, turning the aircraft to the right.